• N2O losses appear to be minimal from dryland low to medium.
• Rainfall farming systems; peak emissions of only 4.0 g N2O-N/ha/day were measured following rainfall.
• N2O emissions from legume stubble over summer and with synthetic fertiliser applied in-crop were low.
• An increase in soil water was the major driver of N2O emissions.

The addition of clay even at low rates of 75 and 150 t/ha have been very effective in increasing the yield from an average 2.45 t/ha of the Control to about 2.95 t/ha. It is expected that the claying will have a long lasting effect and that the yield increases compared to the control will remain.

1. The district practice Baseline system is the most profitable to date. However apart from the 2016 winter crop there is very little difference between the seven grain systems.
2. Water use efficiency is higher for cereals than pulses and is highest in high-yielding crops.
3. Subsoil constraints are limiting PAW extraction by pulse crops.

1. Higher soil fertility was the most profitable and highest yielding system for the 2018 sorghum crop.
2. Higher legume is cumulatively the most profitable system thus far.
3. The Baseline system is falling behind four of the six systems in the trial on most comparisons.

1. Summer break crops reduced levels of cereal soil-borne disease and allowed more even and higher yielding wheat crops in 2018, however they were the least profitable.
2. Root lesion nematodes continued to decline, even under susceptible crops due to the dry growing conditions of 2017 and 2018.
3. Higher nitrogen supply did not increase plant uptake or yield due to low in-crop rainfall, but this extra nitrogen is still available in the soil profile for following crops.

• Sowing date, uniform sowing depth and weed control are just as important to maintain yields in a wide row system as in conventional systems.
• The results in 2001 indicate that the wide-row system has potential at the yield levles typically achieved in the central-northern Mallee.

Three projects are running, one in each of the western, northern and southern GRDC regions. NSW DPI and FarmLInk, together with Southern Farming Systems, the Mackillop Farm Management Group and AgGrow Agronomy, are responsible for the Southern GRDC region.

The project still underway, the analyses of samples will be completed during 2016.

• This preliminary study suggests that both chaff carts and windrow burning removes significant amounts of nutrients from the paddock.  Most of the K left behind in the windrows remains in the paddock.  However, most harvesters now have auto-steer so these nutrients are effectively placed in the same strip each year.  Growers who make windrows and have auto-steer are advised to embark on a program of moving the windrow across approximately 1m each year.  If they do not move the header each year then all of the K is placed in the same strip each year which is essentially lost from the system which is a big cost to the grower (Table 3).
• While the Harrington Seed Destructor (HSD) may be more capital intensive and more costly to run than a chaff cart or windrow burning, all of the nutrients contained in crop residue remain in the paddock.  The true cost of all systems should be considered when deciding which method of harvest weed seed management to adopt.  For a header harvesting 3000ha at an average yield of 3 t/ha the cost of the three systems is similar (assuming the header moves across 1m each year when making windrows) (Table 3).  For a smaller area of crop the relative cost of the destructor and chaff cart increase due to the capital cost being spread over a smaller area. 

The basic message has been to 'wherever possible maintain your normal management practieces'. Changing rotations, cutting back on yield, generating inputs and taking short cuts only serves to increase the risk of missing out on a return to profitable growing conditions this year.

• Conventional tillage enhances soil organic carbon (SOC) turnover with the potential to simultaneously increase plant available nutrients [nitrogen (N), phosphorus (P), sulfur (S)] in the soil compared with no-till and perennial pasture.
• Across farming management practices and under ideal soil moisture, soil organic matter (SOM) could have supplied up to 45 kg N, 16 kg P and 19 kg S/ha in the absence of plant carbon (C) input.
• Over a longer period (126 days), particularly if there is a lack of plant C input (e.g. a normal fallow period), any P or S released via native SOM turnover over a shorter period (e.g. over 30 days) would have been immobilised by microorganisms and/or adsorbed to soil minerals, hence decreasing P and S availability for crop uptake

Variable rate fertiliser application has a real and profitable place in the Mallee when combined with good paddock science. The precision technology gives the ability to examine the yield data for many effects including other possible influencing factors such as elevation, slope aspect or orientation to the sun, and probably many others.

• Time of sowing had a greater influence on oat grain and hay yield, and oat grain quality than variety selection or level of applied nitrogen in 2015.
• High screenings limited the ability of grain to meet Oat1 quality standards, this was due to the detrimental impact of delayed seeding and/or applied nitrogen in excess of that required in lower rainfall environments.
• Applying more than 20 kg N/ha did not improve the return per hectare ($/ha); rather, applying 80 kg N/ha consistently reduced return per hectare ($/ha).
• Screening of Williams and Carrolup were more sensitive to applied nitrogen than WA02Q302-9, Bannister and Yallara.
• WA02Q302-9 appears a suitable replacement for Yallara and Carrolup, and should achieve a better hectolitre weight than Bannister at similar or lower yields.

• Hay crops can be used for both risk management and as part of an integrated herbicide resistant grass management program.
• Paddock selection is important. It is best to select a paddock with a low weed burden; there are limits to the amount of ryegrass that is accepted for export oaten hay.
• For quality oaten hay it is important to minimize stem thickness; this can be achieved by the use of high seeding rates. Cross sowing may be necessary to ensure windrows are supported by stubble for bailing, especially if sowing using wide row spacings.

• Latest released variety ATR Snapper recorded the greatest yield and had the highest oil content at 0.95 t/ha and 45% oil content.
• Tanami (released 2006) recorded the lowest yield and also the lowest oil content, averaging 0.57 t/ha and 41.5% oil.
• Older varieties Tanami and Cobbler yielded significantly less than Snapper, demonstrating how newer varieties with similar agronomic attributes can be more profitable.

• There is firm evidence that, in addition to climate variability, there are also changes (trends) in key climate indices (i.e. rainfall and temperature) resulting from human activity, which will have important consequences on agricultural production in Australia.
• Good risk managers need to consider both climate variability and change in their on-farm plans in order to ensure future sustainability.
• Under changed climate conditions (up to 1.1oC warmer and up to 6% drier) expected around 2030 simulation studies show that in the Wimmera Mallee region yield losses can be offset through improved residue management and longer fallows.

• Average grain yield for the untreated control plots was 2.34 t/ha. Clay spreading and rotary spading gave the largest machine harvest grain yield responses of 400 kg/ha or more, mouldboard ploughing 270 kg/ha and one-way ploughing 180 kg/ha (Figure 1) compared to their nearest comparative control plots. Offset discs gave no yield response in 2013 but did have positive yield responses in previous seasons (Table 1).
• Grain protein levels averaged 11.4% for the untreated controls, clay spreading had 0.5% more protein and mouldboard ploughing 0.2% than their neighbouring controls (data not shown).
• Screenings for the majority of treatments averaged about 2.1%. Mouldboard ploughing was the only treatment to have significantly lower screenings of just 1.2% (data not shown).
• Total above-ground shoot biomass and head number was assessed using plant cuts (Table 1). Shoot biomass on average was increased by 95% (+4.3 t/ha) by rotary spading, 57% (+2.7 t/ha) by clay spreading and 47% (+2.3 t/ha) by mouldboard ploughing compared to the untreated controls. Head numbers on average were increased by 32% (78 heads) by spading, 22% (58 heads) by mouldboard ploughing and 17% (43 heads) by claying compared to the untreated controls.
• Observations made earlier in the season indicated that emergence of many plants in the untreated control areas was delayed and had fewer tillers than the earlier emerging plants in the many of the treated areas.
• The whole plant cut transects were taken across different soil types, rotary spading gave the best results on the poor pale deep sand at this site while mouldboard ploughing performed best on the better yellow sand (Transect 3).
• The net 3-year benefit and return on investment (ROI) has been determined for the first 3-years of the trial (Table 2). Estimated costs for the amelioration treatments are based on owner-operated and contract rates. Benefits associated with some of the treatments such as weed control for the mouldboard plough and reduced wind erosion for the claying treatment have not been included.
• The one-way ploughing treatment was the most affected by wind erosion in 2011, resulting in a loss in grain yield and income which has substantially reduced the net benefit and the return on investment for this treatment although the subsequent years have been profitable (Table 2). Of the other treatments rotary spading and mouldboard ploughing had the highest net benefit, driven largely by the large lupin yield increases measured in 2012. Claying also had impressive yield gains and substantial increases in income (Table 2) but the high cost of this treatment reduced the 3-year net benefit and return on investment relative to the deep cultivation treatments. Given that claying can show benefits for decades net benefit and ROI for this treatment should continue to improve over time and it still only took 2 years to cover the cost of the treatment. Offset discs had grain yield benefits for the first 2 years but showed no response in 2013 suggesting that the benefits of the shallow cultivation may have dissipated.

• Onion weed is a significant pest and competitor of medic pastures. In mixed farming systems, control in the pasture phase is often reliant on cultivation.
• None of the herbicides evaluated in this trial provided adequate onion weed control in the medic pasture phase without unacceptable reduction in medic biomass.
• The use of non-selective herbicides and their mixes, combined with strategic cultivation if required, is still the most effective short term strategy in reducing the impact of onion weed on crop/pasture systems on Eyre Peninsula (EP).

Opportunistic summer cropping can make use of summer rainfall that may otherwise be lost to evaporation.

• Continuous cropping can be sustained for decades, but requires careful management.
• A larger proportion of N supply as fertiliser will be required over time even when grain legumes are included in crop sequences.
• Herbicide resistance develops faster under continuous cropping. Integrated management to keep key weed populations at very low levels is essential for long-term viability.
• Suitably diverse crop and end-use portfolios and flexible management help build resilience to climate and crop price shocks.

The INSPIRE Summit was an overwhelming success. Registrations quickly sold out and were then extended. The atmosphere at the 2-day event was inspiring in itself. Growers were enthusiastic, ready to learn and relished the opportunity to network with like-minded women and industry representatives. Feedback from participants, speakers and sponsors was all extremely positive. The event received good publicity locally, state-wide and nationally. Participants left the event feeling confident and ready to implement changes in their businesses.

The objective of this GRDC / SPAA funded project is to increase the level of adoption of PA 'beyond guidance' by broadacre farmers. The project specifically aims to increase the level of adoption of variable rate (VR) by growers in the project to 30% by 2013.This goal will be achieved by demonstrating how to use PA tools to growers at a regional level and by increasing the skills of growers and industry in PA to a level where they can then use PA tools in their farming systems to achieve economic, environmental and social benefits.

The objective of this GRDC / SPAA funded project is to increase the level of adoption of PA 'beyond guidance' by broadacre farmers. The project specifically aims to increase the level of adoption of variable rate (VR) by growers in the project to 30% by 2013.This goal will be achieved by demonstrating how to use PA tools to growers at a regional level and by increasing the skills of growers and industry in PA to a level where they can then use PA tools in their farming systems to achieve economic, environmental and social benefits.

The objective of this GRDC / SPAA funded project is to increase the level of adoption of PA 'beyond guidance' by broadacre farmers. The project specifically aims to increase the level of adoption of variable rate (VR) by growers in the project to 30% by 2013.This goal will be achieved by demonstrating how to use PA tools to growers at a regional level and by increasing the skills of growers and industry in PA to a level where they can then use PA tools in their farming systems to achieve economic, environmental and social benefits.

• Commercially acceptable grain yields can be achieved from pasture cropping systems in Southern Victoria.
• At this stage, traditional winter crops sown into a lucerne stand has the best fit for our environment..
• Lontrel can be successfully used to inhibit lucerne growth during the crop phase.
• Barley returned the best grain yield averaging 5.5 t/ha and topping at 6.3 t/ha.
• Wheat averaged 4.3 t/ha and canola averaged 1.7 t/ha.
• Lucerne on wide row spacings (30 cm) can help to improve yield and grain quality.
   

• Crop seeding rate and perennial row spacing both influence grain yield of pasture crops.
• Lifting seeding rate of pasture crops might compensate for poorer establishment and, in turn, help to reduce any grain yield penalty.  For this experiment and assuming lupin seed is $300/t, lifting seeding rate by 50 kg/ha ($15) helped to avert a 26% yield penalty and proved to be $165/ha more profitable overall.
• Where growers do not own a disc machine but have invested in precision guidance technology, with forward planning, it is feasible to use a tined machine to sow crops into perennial pastures without damaging the perennial base.

Livestock in farming systems provide a level of risk management compared to a solely cropping enterprise. Average stocking rates on pastures are substantially lower than could potentially be achieved through the adoption of more appropriate pastures. The lack of suitable pastures is due to perceptions of poor economic returns as a result of difficulties with the establishment and persistence of pastures, and problems with the seasonal nature of pasture production leading to excessive production in the spring and lack of production in the autumn.

• The MLA trials demonstrated that early summer seeding (January) of Serradella pod was a viable option. The summer sowing of Serradella pod has outperformed the twin sowing methods in the two trials conducted by SCF growers
• The current district practice of dry seeding pasture seed in Autumn on sandplain soils has severe limitations compared to summer pod sowing or seeding when soil is moist after full seasonal break. This was confirmed in the 2014 season in the MLA trial where the second time of sowing (into moist soil) outperformed the first time of sowing in total legume biomass production and this advantage has carried right through to seed set in Year 3 (in M1 trial Santorini and Margurita plots).
• The performance of a precision seeder for sowing Serradella in a 2015 trial demonstrated that modifications of conventional seeding systems could improve plant establishment efficiency by more that 35%.
• The hard seeded Serradellas are performing well in specific treatments in the MLA trials even on the lower fertility, acidic and non-wetting sandplain soils. Mixed maturity Serradellas like cv Margurita lose significant pod set with spraytopping ryegrass compared to Cadiz or Santorini.

• The yield of the trial was not collected by the weigh trailer, but I felt the wheat on the fallow trial was at least 20-30% higher yielding than the wheat on wheat.
• The wheat on the fallow trial was higher in stature, looked a lot healthier and larger grain size.
• Looking overall at yield wheat on wheat would have been 0.9 to 1 t/ha and the fallow would have been approx. 1.2 to 1.3 t/ha.

Although the results were inconclusive at the Tottington site, the group believes that use of the triple pack program in normal years is likely to improve perennial pasture establishment in this drier northern region. It could also be relevant in other areas, where run down low fertility paddocks have a low legume content and have become dominated by onion and silver grass.

Further cost benefit analysis is warranted for the Triple Pack system before it is widely promoted to producers. PPS were unable to conduct a cost benefit analysis at Tottington due to the extreme seasonal conditions affecting results.

• Demonstration sites are monitored annually for pasture and surface cover, biomass production and frequency of perennials.
• Soil sampling will occur again in late 2014/15 to determine any change in soil organic stocks as a result of the implementation of a change in management practice.

• Atriplex and Rhagodia species fared best in these experiments, producing the hightest biomass on offer to sheep, plant survival rate and health scores.
• Four species showed poor adaptation to the environment at Walpeup and produced little edible biomass, namely Atriplex semibaccata, Convolvulus remotus, Cullen australasicum and Medicago strasseri.
• Results from this experiment and others across the nation have led to establishment of a new site a Manangatang that demonstrates the most promising spcies for the Mallee region's poorest soils.

• First wheat following canola yielded between 3.65 and 5.35t/ha depending on row spacing, plant population and nitrogen application.
• A narrow row spacing of 22.5cm produced higher dry matter (DM), grain yields and water use efficiency than a wider row spacing of 37.5cm.
• Higher grain yields were associated with plant populations of 150-165 plants/m2.
• Wide row spacing reduced grain yields by and average of 6.5% and DM by 15% compared with narrow row spacing. 

• Crusher TT canola yielded between 2.24–2.79 t/ha with 232mm of growing season rainfall (Apr–Oct) and an estimated 118mm of stored available soil moisture (total 350mm).
• All plant populations were high (150–200 plants/m2) due to an error in calibration, however results produced were similar to previous years, with no significant difference in yield between the narrowest (22.5cm — 2.67t/ha) and widest (37.5cm — 2.75t/ha) row spacings.
• The 30cm spacing yielded significantly lower than both the 22.5cm and the 37.5cm spacings in this trial. 

For a summary of key messages and results see the attached trial report.

• Canola following two years of wheat yielded 2.08t/ha despite establishing 50% fewer plants than canola grown during 2009, which yielded 1.59t/ha. The higher yield achieved during 2011 was attributed to more stored soil moisture at sowing. 
• The higher biomass produced with the narrower row spacing (22.5cm) did not translate into higher grain yield with the same yield achieved across the narrowest (22.5cm) and widest (37.5cm) row spacings.
• About 102-122kg nitrogen/ha was removed in aboveground biomass (straw and grain). There was no statistical difference in nitrogen off-take between the 22.5cm and 37.5cm row spacings.  

• Canola trials during 2012 had high plant populations, which may have created atypical crop canopy structures in relation to different row spacings.
• In four canola datasets generated from 2009 – 2012 at Coreen, New South Wales and Bungeet, Victoria the influence of row spacing on yield has been inconsistent.
• During 2012, the narrow row spacing (22.5cm) produced higher yields and a higher harvest index (HI) than wider row spacing, however this has not been the case in previous years. 

• With 537mm growing season rainfall (April- mid-November) wheat yields followig faba beans were 2.2t/ha higher than those experienced in 2009.
• The yield reduction moving from a narrow row spacing (22.5cm) to wide (37cm) was 12% (0.64t/ha), compared with 16% (0.49t/ha) in 2009.

For a summary of key messages and results see the attached trial report.

• With 570mm growing season rainfall (GSR) 2010 wheat yeilds were more than double those experiences during 2009 in the same rotation position (wheat after canola).
• Yield drop-off associated with the wide row spacing (37.5cm) was almost identical to 2009 results, with a 12% yield reduction compared with the narrow row spacing.

• In the 2012 wheat after canola trial, moving from a narrow row spacing (22.5cm) to a 30cm spacing reduced yield by 9%.  Moving from 22.5cm to the widest (37.5cm) row spacing reduced yield by 11%.
• In a season where yields averaged about 3t/ ha overall (based on a GSR of 196mm plus 85mm stored soil moisture), increasing row spacing beyond 22.5cm significantly reduced yield.
• During 2009, in the same rotation position on the same trial site, there was no difference in yield between the 22.5cm and 30cm row spacings (based on 2.5t/ha average yields), although the 37.5cm row spacing still yielded significantly less. 

For a summary of key messages and results see the attached trial report.

• In second wheat after faba beans, moving from a narrow row spacing of 22.5cm to 30cm and 37.5cm row spacings reduced yield by 4% and 10% respectively.  This compares with respective yield reductions of 12% and 14% in the fi rst wheat trial grown in the same paddock at the same time.
• The narrow row spacing (22.5cm) produced greater biomass than the wider row spacing but had a relatively poor harvest index (26%) compared with other row spacings in this trial.
• There was no difference in crop establishment or yield due to drill opener (tine versus disc), however plant establishment was superior with the narrow row compared with the wider spacings tested.
   

• Gauntlet wheat sown as the second wheat crop after canola yielded between 3.84–4.44t/ha with 232mm of growing season rainfall (Apr-Oct) and an estimated 118mm of stored water at sowing (total 350mm).
• Moving from a narrow row spacing (22.5cm) to 30cm and 37.5cm row spacings reduced yield by 13% and 11% respectively in the 2012 season.  In 2011, moving from a 22.5cm spacing to 30cm and 37.5cm spacings reduced yield by 4% and 10% respectively for the second wheat trial grown in the same paddock.
• It was estimated that the narrow row spacing (22.5cm) resulted in better water use efficiency (WUE) than the widest spacing (37.5cm), despite having a lower harvest index (44% vs 47%) than the widest rows.  

• Wheat on wheat (following canola) yielded 4.91t/ha, almost 1t/ha less than the neighbouring first wheat trial after canola, which yielded 5.84t/ha.
• There was no yield drop-off associated with wider row spacings (30cm and 337.5cm) in this wheat-on-wheat situation.

• Plant establishment at a 22.5cm row spacing was signifi cantly superior to 30cm, which in turn was signifi cantly higher than 37.5cm. The disc drill opener gave better establishment than the tine at the narrow (22.5cm) row spacing but not at the wider row spacing. 
• Advantages with the narrow row spacing were seen early in the season in terms of plant population, dry matter (DM) and tiller production. These advantages did not translate to signifi cantly higher yield in this rotation position. This result was identical to the results of the 2010 trial when wheat on wheat yields showed a similar, but not signifi cant, trend for narrow row spacing (22.5cm) to be better than wide row spacing (37.5cm). 

The Rand site was sown on the 12th May 2010 with 8 treatments of various amounts of seed and P fertilizer. The variety was Lincoln and the sowing fertilizer was MAP. The site had grown canola in 2009 and had been summer sprayed for weeds. It was direct drilled into the canola stubble. The site had an N rich strip of 50hg/.ha of N applied about 5 weeks prior to the assessment in July 2010.

The objective of this GRDC / SPAA funded project is to increase the level of adoption of PA 'beyond guidance' by broadacre farmers. The project specifically aims to increase the level of adoption of variable rate (VR) by growers in the project to 30% by 2013.This goal will be achieved by demonstrating how to use PA tools to growers at a regional level and by increasing the skills of growers and industry in PA to a level where they can then use PA tools in their farming systems to achieve economic, environmental and social benefits.

The objective of this GRDC / SPAA funded project is to increase the level of adoption of PA 'beyond guidance' by broadacre farmers. The project specifically aims to increase the level of adoption of variable rate (VR) by growers in the project to 30% by 2013.This goal will be achieved by demonstrating how to use PA tools to growers at a regional level and by increasing the skills of growers and industry in PA to a level where they can then use PA tools in their farming systems to achieve economic, environmental and social benefits. The grower mentioned the importance of correctly identifying the GPS coordinate locations to get reliable soil type information. Yield maps provided showing areas of the paddock with high and low potential assisted this process. Soil analysis verified the trends produced by the yield map.

• The production and farm management lessons learned during the project will be made available to the KI farming community and wider South Australia through a range of information events, including field days, offered during the project and at the conclusion of the programme.

• During 1997 make the most of the technology and services available.
• Soil testing prior to sowing.
• Monitoring your crops with sap nitrate testing, NIR analysis, plant tissue and grain tissue testing during the season will enable you to make informed decisions and to capitalise on the opportunities presented.

• This demonstration suggests that there is a trend towards higher yields as a result of ploughing stubbles.
• The cost of ploughing stubbles is relatively low and it may be an effective way to increase soil organic matter.

Standard farmer practice of 'pasture topping' in the previous year, followed by a knock down around the seasons break, remain the best practice before sowing saltbush or bluebush by seed.

Barley yields exceeded 5 t/ha with strong responses to lime and potassium fertiliser.

The 1.0 t/ha response to potassium (K) was not as strong as in the previous two wheat crops (1.4 t/ha in 2013 and 2.4 t/ha in 2014). This was probably partly due to better control of ryegrass in plots without K fertiliser compared to previous years.

The response to lime applied in 2011 and 2014 was also 1.0 t/ha. This followed a 0.35 t/ha response in 2014 wheat. Like 2014, lime did not affect response to K.

Compared to topdressing potash, banding K increased early crop vigour, but 140 kg/ha K-Till Extra (15K) did not supply enough K to satisfy demand of the high yield potential.

This trial has highlighted the importance of maintaining K inputs (if required) when undertaking liming programs.

Ongoing responses to lime are likely to increase future demand for K because soil reserves will be depleted at an increasing rate.

Standard farmer practice of 'pasture topping' in the previous year, followed by a knock down around the seasons break, remain the best practice before sowing saltbush or bluebush by seed.

Standard farmer practice of 'pasture topping' in the previous year, followed by a knock down around the seasons break, remain the best practice before sowing saltbush or bluebush by seed.

The data received from the 2007 trial year proved similar results to 2006. Although we received an extra 50mm more growing season rainfall than 2006, it was still 50mm short of the Corrigin average rainfall. With yields over 3t/ha, no-one can complain though, especially with barley prices around $480/t cash, at harvest in 2007. In terms of the trials’ aim – to find which stubble treatment better suits downhill tramlinning, the jury is still out as for the two years that the trial was run; 2006 & 2007, with limited rainfall we can only draw conclusions on the results that have been found; and for both years it was found that the burnt stubbles had higher yields over all. The burnt plots [having barer ground to seed into] collected more runoff than the other treatments in 2007. Removing the stubble can allow for light falls of rain to be more useful for a crop in such years, hence the better yield whereas having high levels of stubble in such cases can often intercept this moisture making it not available to the crop; rainfall that ponded on the stubbles evaporated before the plant could acess it [Jeff Russell pers.comm]. Subsoil moisture could have played a part in the earlier establishment of the burnt stubbles too as these plots would have got away sooner having no surface restrictions [stubble or organic matter] and therefore these plots would have had a chance to tap into the summer rainfall earlier than the other treatments [Glen Reithmuller pers.comm]. According to Dan Carter [DAFWA], burning stubbles removes valuable nitrogen, soil carbon and other nutrients and leaves the ground vulnerable to damage from wind erosion. In most cases, retaining stubbles will contribute to long-term soil fertility, through both preservation of nutrients and better moisture-holding capacity.

 

In saying this however, we found in 2007 [as we did in 2006] that the burnt [bare] stubble treatments yielded higher than any of the other stubble treatments as seen in trials. To compare against the control treatment, which has the least runoff, we use the 5%LSD = 2.14*3.94 = 8.4, which suggests that the burnt/bare and raked are significantly higher than the control since the difference between the means is higher than the LSD.

 

Key achievements were getting the trial in the ground, harvesting and collection of results. Also successful application for 2nd & 3rd years of funding Project 053042 – Precision Agriculture Systems – Impact on zone management, soil health and surface water management (Years 2 & 3).

Key findings from the trial in 2006 were that the most run off was collected from burnt stubble tramline which suggests that bare ground with tracks, can potentially aid the channelling of water more than with stubbles where water can ‘dam’ with the interference of stubble and foreign matter. As this was the first year of the trial at Corrigin it raised many more questions which will hopefully be answered in the next two years.

Late notification of project approval combined with difficulty in employing a suitable coordinator resulted in the project starting 6 months late (February 2006).

Farmer with tramlining capability easily identified.

Paul Blackwell’s (DAFWA) assistance proved beneficial, were able to combine two trial sites into one paddock to better utilise the farmers controlled traffic system. Minor issue occurred when fire from burning chaff heap destroyed original stubble trial site. New site established.

The biggest issue for the trial in 2006 was lack of heavy rainfall events, while a crop was taken off, there were very few rainfall events greater than 10mm.

Several issues occurred with the design, construction and collection of water from the water traps. After consultation with Paul Blackwell on trap design and a visit to his Pindar site (Liebe project) to visually assess the traps, we had a better understanding of how to construct the Corrigin traps. To bury 20 chemical containers into hard soil it was decided to hire local contractor to use his backhoe/digger to dig them out.

Collection of water from the water traps was a major issue too. A range of equipment and methods was trialled and found to be inadequate. After consultation with the local businesses in town, a powerful suction pump that could be screwed to a battery pack for power and ease of moving was order. The pump proved to be the right combination for the job required. A further issue arose over the 2006 trial year with water traps chemical drums becoming

slimy and animals getting trapped resulting in  blocking and clogging of the pump. To overcome this problem in 2007 we decided to a) place gauze over the hole from the trap to the pipe leading to the drum, so large matter cannot enter the drum. This has worked well so far, however it has restricted some trap’s water from entering the pipe. We are currently working on rectifying this problem. and b) a second filter was put on the water pump so now it has a main filter and a hose filter to sort though the ‘gunk’ before allowing it to enter the water pump.

 

• Yields at very low seed rates of 0.3 and 0.5 kg/ha were comparable to yields at higher seed rates of 1.0 and 2.5 kg/ha when using a precision seeding machine.
• Yields in excess of 2.0 t/ha were achieved when sowing at 50 cm row spacing.
• These results suggest we should continue investigating more precise seed delivery systems.

• Yields at very low seed rates of 0.3 and 0.5 kg/ha were comparable to yields at higher seed rates of 1.0 and 2.5 kg/ha when using a precision seeding machine.
• Yields in excess of 2.0 t/ha were achieved when sowing at 50 cm row spacing.
• These results suggest we should continue investigating more precise seed delivery systems.

• Nodulation can be very poor and very patchy, and measures to improve both the level and consistency of nodulation are needed.
• Growers are encouraged to take root samples of legume crops in late winter or early spring to assess nodulation. A nodulation assessment guide that includes photos of plants with poor and good nodulation is available online.
• AgKI has received funding through GRDC for bean nodulation trial work in 2015 – so hopefully next year’s Ag Trial booklet will have good news about how to improve nodulation.

• Field peas were the stand out crop in terms of both dry matter production (5.8-6.5 t/ha) and grain yield (1.7-2.3 t/ha)
• Excellent grain yields were generally achieved for the other pulse crop options; chickpea (1.5-1.6 t/ha), lentil (1.5 t/ha), faba bean (1.4 t/ha) and lupins (0.9-1.2).
• Over two seasons at the site, Kabuli chickpeas have been the most profitable crop option followed by Desi chickpeas and field peas. Lentils were the most profitable option in 2014.
• There were no significant dry matter differences between treatments in the Brown Manure trial with all producing about 4.5 t/ha.

Two significant weather events that had an important influence over the results in this project, in 2016, frost and 2017, summer rain. In 2016, there were multiple severe frost events during the critical, flowering stage of the growing season. Oats being a relatively frost tolerant species proved to be the best performing species for yield and gross returns in 2016. The broadleaf crops, both legumes and canola were severely impacted by frost.

For barley in 2016 the accumulated gross returns for two years was higher in rotation, fallow 2015; barley 2016 when compared with wheat 2015 barley 2016. This supports previous work by CFIG that including fallow in the rotation can increase gross returns over a two year period.

In season 2017 frost damage was minor when compared to 2016. Season 2017 was dominated by heavy summer rainfall and a very dry start to winter. The fallow plots were impacted by the summer rain due to lack of soil cover. The loamy, morrell soil set hard at the surface as a result of the heavy summer rain which severely impacted penetration of the seeding equipment and subsequently, crop establishment was poor. The very dry start to the season likely exacerbated the poor establishment on the fallow plots.

Oats performed well again in 2017 in terms of yield but barley produced higher gross returns. Chickpeas and lentils were the best performing of the broadleaf crops in 2017.

When the gross returns in 2017 were compared by rotation (2015-2017), it is interesting to note that 2017 cereals grown in rotation with legumes in 2016 generally performed well.

The gross returns for every rotation tested in the trial were compared on an accumulative return over 3 years (2015-2017) and the rotation with the highest accumulative return was year 1; wheat year 2; chickpeas and year 3; barley. This demonstrates the value of a legume in a rotation which contributed to the highest yielding plot, which was barley in 2017.

The top two highest total gross return rotations over three years had a legume crop in one year of the rotation. The third highest return rotation had a fallow phase which confirms fallow as a rotation option. In the top 10 highest returning rotations, 4 had fallow in one year of the rotation.

• The results from experimental comparisons of crop sequences of at least two and three years’ length undertaken over the last five years in the SE Australian cropping belt were consistent with findings from previous local and global research
  that has demonstrated that sequences including break crops tend to be more productive than continuous wheat.

The outcome from this project will be more reliable and more productive low rainfall farming systems through the increased use of less risky broad leaved break phases.

This will be achieved through the promotion of the following outputs from the proposal in low rainfall regions of south eastern Australia 1. More reliable management strategies for the production of broad leaved phases.

2. Identification of more reliable break phase options.

3. Guidelines to identify trigger points for when, for how long and which break phases to use for improved farming systems outcomes.

4. Reliable estimation of risks with break phases as well as their total impacts on following cereal crops.

A break of two years can produce a better financial outcome than continuous wheat over a four year period of production where there are substantial pressures on wheat performance (eg. grassy weeds). Wheat yields after a two year break were a significant step up from wheat crops following a one year break, which were in turn, much better than the continuous wheat. Large break crop benefits of 0.5-1.25 t/ha were achieved following a two year non-cereal break phase compared to continuous wheat. The break crop benefit of a one year break may only last one season if grass weeds are a significant factor. The major benefit of breaks in these long term cereal paddocks was to reduce grassy weed pressures for subsequent wheat crops phases. The benefit of a two year break had little to do with the phases chosen for those two breaks, providing that excellent grass weed control could be achieved in both. Many of the most profitable crop sequences over the four year period often started with a two year break phase.

• Continuously cropping cereals has increased grass weeds and root disease to a point that it is no longer the most economical option, due to decreased yield and costs associated with addressing weed and disease issues.      
• Two year breaks starting to pay their way in the third year of the rotation. One year breaks have lifted wheat performance but have not kept grassy weeds or diseases under control.

When compared to fallow, the 2005 grain yields from the field pea more than compensated for the subsequent 2006 wheat grain yield reduction.

• Crops can be established and grown in 6.6 t/ha of retained stubble in the HRZ without compromising establishment
• Stubble retention in the HRZ requires careful systems based planning and attention to detail
• Seasonal conditions will strongly influence outcomes of stubble retention through factors such as pest pressure and conserving soil moisture
• Burning may not be an option in the near future because of unacceptable risks of litigation 

Pulses have a major role to play in the cropping rotation in the high rainfall zone. Many growers are already achieving good results due to sound management and the ability to ensure that operations such as sowing and spraying are done on time. These growers have shown that if done successfully, pulses can form a profitable part of the rotation. In the high rainfall zone they can be high yielding and produce a sound gross margin, as well they provide opportunities for disease breaks and herbicide rotations and the grazing value of some pulse stubbles, such as beans and peas, should not be under estimated

• Faba beans appear to be the most promising pulse crop for raised beds in the Geelong area. Field peas have been grown for decades in this district and if varieties with improved standability can be found, they should be a second viable pulse. The present semi-leafless varieties offer a crop architecture that is almost suitable for our requirements. 
• It is suggested that faba beans and field peas be commercially trailed on raised beds in 2000
• For full discussion and comments from 1999 observations, please see the attached trial report.

• Chickpeas were consistently amongst the highest yielding pulses at this site across all soil types and EM39 ranges.
• They produced the highest gross margins on both the deep sand and the mid-slope soils.

• Height to lowest pod was greater in wider rows for beans compared to peas or chickpeas.
• Beans were higher yielding on narrower row spacing.
• Standing stubble did not increase grain yield in any pulse crop trialled.
• Standing stubble improved bean yields only at the wide row spacing.

Earlier sown beans and lupins proved that pulses can yield in a very dry year. Although yields were comparatively low, an economic analysis has revealed that this enterprise selection was still profitable. Later sowing of peas, chickpeas and lentils showed little benefit due to the lack of follow up rainfall.

• Five new pulse varieties were released for southern Australia in 2013. It is important to carefully assess the agronomic, disease and marketing strengths and weakness of each variety, and their overall role in the farming system.
• The warm, wet winter favoured biomass production and early botrytis grey mould onset in lentil and faba beans in 2013. Timely canopy closure fungicide application was critical for reducing yield loss in varieties with intermediate resistance.
• Weed competition was a major constraint to pulse production in 2013. A GRDC funded project has successfully developed alternative herbicide tolerances in lentil and faba bean and field validation is expected in 2014.  
• Clethodim resistant ryegrass is becoming a major issue in pulse production and alternative weed control strategies require investigation.

• Five new pulse varieties were released for southern Australia in 2013. It is important to carefully assess the agronomic, disease and marketing strengths and weakness of each variety, and their overall role in the farming system.
• The warm, wet winter favoured biomass production and early botrytis grey mould onset in lentil and faba beans in 2013. Timely canopy closure fungicide application was critical for reducing yield loss in varieties with intermediate resistance.
• Weed competition was a major constraint to pulse production in 2013. A GRDC funded project has successfully developed alternative herbicide tolerances in lentil and faba bean and field validation is expected in 2014.
• Clethodim resistant ryegrass is becoming a major issue in pulse production and alternative weed control strategies require investigation.

• Early application of foliar zinc at the 2 leaf stage may assist with suppressing initial yellow leaf spot infection but unlikely to be enough to overcome any zinc deficiency in crop as leaf area limits capacity for uptake.
• Stubble management techniques that aid stubble breakdown or removal are effective measures to control incidence of yellow leaf spot in crops sown into stubble.

• Results showed 100% of the ryegrass samples and 22% of the sow thistle samples were resistant or developing resistance to at least one herbicide, with multiple resistance common in ryegrass.
• Growers and advisers were accurate 74% of the time when predicting ryegrass resistance. This reduced to 65% for post emergent herbicides.
• No-till continuous cropping rotations hosted higher resistance levels and often to more herbicides than less intensive rotations including pasture. However, in many cases, samples from paddocks that have had minimal herbicides often showed resistance to multiple herbicides.
• Cross resistance between Logran and Hussar in ryegrass was lower than expected.

In 2015 mouse monitoring will continue at all of the regional sites. To further identify mouse population dynamics CWFS will also be in contact with further persons from each region to identify mouse activity perhaps not recorded by monitoring activities. To be involved in mouse monitoring, or if you have any observations or queries, don’t hesitate to call Nick Hill at CWFS on 02 6895 1038 or 0437 612 140.

Weeds external to a cropping area (ie; along fence lines and roadways) are a known problem. They impact negatively upon a cropping operation in a number of ways; ie,

• Pest insects - Weeds can provide refuge for insect pests and act as a point source of distribution into a cropping area.
• Diseases - Weeds can act as a host for crop disease. When an infected weed is fed upon by a pest insect (e.g. aphid) and the pest insect then feeds upon a plant within a cropping zone the disease is transferred to the crop.
• Seed - Weeds external to a cropping zone provide a source of seed that can enter and infest a cropping area.
• Mice - Weeds external to a cropping area provide food, moisture and refuge for mice.
• Herbicide resistance - Weeds external to a cropping area do not generally receive the same levels of control as weeds within a cropping area, which can assist in the development of herbicide resistance.
• Green bridge - Weeds that perpetuate external to a cropping season provide what is termed as a “green-bridge”. This green bridge is known to enable pest insects and diseases to survive as well as provide a source of weed seed for future in-crop infestations.

• Phillip Adams has been working on raised bed farming for the past seven years and is convinced the system has significant benefits.
• Raised beds increase the quantity of organic matter in the soil which is of great importance in improving soil structure and promoting germination and growth.
• All land is suited to raised beds, however paddocks where excess water is a problem (eg. sodic soils prone to waterlogging) will benefit the most. The aim of raised bed farming is to produce loose soil beds where water can drain off to prevent waterlogging in the root zones, to provide adequate drainage, and to store excess water for use when conditions turn dry.

• In 2004 the organic system had the lowest wheat yield and the highest screenings.
• The 2004 gross margin showed that the Albrecht, Soil Management Riverina and BioAg systems made a small profit.
• The Conventional, Soil Management Riverina and Organic systems have the best long-term (2000-2004) average gross margins, although they are all negative.

The results are showing up trends and possible differences between treatments, but being a long term trial it may take at least five years before any meaningful data or an accurate assessment of each system can be made.

• Liming and spading had a significant effect on soil pH. The untreated plots (no spading and no lime) had a soil pH that declined from 5.5 to 4.3 down the soil profile.   Simply spading the soil, without lime application, lowered the soil pH of the topsoil to because acidic subsoil is mixed with the top soil.  Liming, without spading, has significantly increased pH levels on topsoil to 5.8 but no effect at depth. Liming together with spading has improved the soil pH at depth.
• Due to variability at seeding and weed control the impact of soil amelioration on productivity of the wheat varieties is not conclusive (CV = 16%). Liming (averaged across variety and spading), reduced yield from 3.2 t/ha to 2.9 t/ha (p=0.009, LSD =0.2). Spading treatments affected seeding depth. This resulted in variable and poor emergence in the spaded treatments. Wheat plant  densities established were 85 plants / m2 in the spaded treatment and 105 plants / m2 in the un- spaded treatment.  Brome grass control was not highly effective and variable across the site. These factors will have influenced the large variability in treatment effects. However future cropping across the trial area may indicate the treatment effects.
• Corack and Mace were significantly higher yielding than Emu Rock, however black point is a risk factor for Corack. The other varieties performed similarly.
• Spading treatments were carried out within a short period prior to seeding and plots were not rolled. This will have had a large influence on the variability of grain yield at the site. To improve future trial research liming and spading need to be carried earlier in the year for soil to settle before seeding or roll soil after spading to prevent machinery from sinking in soft soil.

• Canola can be an expensive crop to grow.
• Yields can be maximised by planting early in low rainfall environments.
• Retained seed from open-pollinated varieties has the potential to match yields of some hybrid varieties.
• Delaying nitrogen application until stem elongation (bolting) was not as effective as applying at seeding or early post-emergence.

• For the 3 phases of methane measurement reported, methane emission intensity (L CH4/hr/100g ADWG) was significantly lower for lambs on a better quality forage with high metabolisable energy, digestibility and crude protein.
• Feedlotting is an option that gives producers the flexibility to finish lambs when pasture availability is limited or light soils are at risk of erosion.
• Spray-topping cereal crops is a good management strategy for weed control and feed management for livestock, however, livestock productivity gains can be compromised when spray-topped cereals are grazed without offering lambs better quality fodder supplements.

Row Spacing: Most pulse crops are adapted to wider row spacings:

• Lupins 18 - 50cm
• Chickpeas 18 - 75cm
• Faba beans 18 - 75cm

Wider rows can reduce foliar fungal disease incidence (increasing airflow) and allow better stubble clearance by sowing machinery. However, good weed control is essential with wider rows.

• This trial yielded 3.4 t/ha without fertiliser but there were still good responses to nitrogen (N) and phosphorus (P). The application of both nutrients increased yields up to 4.5 t/ha.
• There was a 0.6 t/ha response to 80 kg N/ha and a 0.7 t/ha response to 24 kg P/ha.
• 24 kg P/ha applied in both years produced 0.4 to 0.5 t/ha more than where 16 kg P/ha applied both years.
• Residual responses to N and P applied in 2011 were not significant.
• NS 41 applications increased protein from about 12.3% to 13.3%. Hectolitre weights were about 77 kg/hl and screenings averaged 1%.
• The most profitable treatment over the two years of the trial was 24 kg/ha (136 kg/ha Double Phos) applied both years.

The Jibberding site showed a positive and linear response to increasing P with no PR-70.

• Wheat yields in the poor, medium and good zones in response to low, medium and high inputs respectively did not differ significantly in 2011.
• Over a 3 year wheat-canola-wheat rotation there has been no measured production benefit from applying 6 kg/ha of P on the good soil type as opposed to nil P on a shallow constrained soil.

• 4 kg/ha of P as a blanket application increased grain yields and gross margins over nil P in all 3 soil zones, however applying a variable rate to the medium soil zone of 8 kg P/ha improved gross margins over the 4 kg/ha rate.

• In a good growing season, wheat performed equally well in zones identified as good, medium or poor however they achieved only 50% of their yield potential water use efficiency.

• Annual medic plant establishment density limited by 2008 drought, mice and possibly a false break.
• Pasture production restricted by low plant numbers but increased by 2010 P applications.

• In an above average season a high input system was the “best bet”.
• Variable rate had reduced production but at a lower risk.

• Sowing in early June 2009 resulted in wheat yields on 3 soil types being similar but only achieving 50% of potential water use efficiency.

• After two good seasons a variable rate approach is as profitable as a low input blanket approach and more profitable than a standard blanket approach.

• The profitability of VRT, excluding capital outlay, was just better than standard practice over the last two seasons at Minnipa.
• The long term impacts of reducing inputs and any consequent yield reductions in above average seasons are yet to be determined.

• WI3806-1 is an early maturing line equivalent to Keel in the good years and better in the bad ones.
• Very early maturing barley varieties will provide farmers with more cropping options.