For further information see Payne, RA and Ladd, JN (1993) Soil organic matter and nitrogen management in dryland cropping systems, Part II: Nitrogen requirements for dryland cereal crops. Dept Primary Industries of SA. Technical Report No. 212 (Agdex 536).

With extremely dry conditions following both sowing on 6 June and nitrogen application, there was no response to nitrogen application in this trial, despite the low level of available soil nitrogen (52kg/ha N, 0-130cm) recorded at the start of the season. • With yields in the range of 1.3-1.6t/ha, there was no response to applied nitrogen regardless of the timing or product used. • There was no evidence to indicate that, under these conditions, liquid fertiliser (Easy N - 32% w/w (16% urea, 8% nitrate and 8% ammonium) or Green Urea 14 (an agrotain urease inhibitor coated urea) were superior to straight urea (46%N).

The site at the BCDS looked the most promising of all 14 sites, unfortunately the frosts in late September and early October reaped havoc on grain yield.

There was a significatn difference (P < 0.05) in the yield and protein levels between varieties but there was no difference in yield and protein due to the different fertiliser treatments within a variety.

To manage N2O emissions in low to medium rainfall environments, growers need to match nitrogen supply to crop demand. Lowest emissions were measured where nitrogen levels were least, while highest emissions occurred where nitrogen levels were greatest. Applying late nitrogen to increase wheat protein is not economic when segregation price differentials are small.

• Noodle wheat production was not suited to this paddock due to the high soil nitrogen levels. Milling wheat production was a much better choice for this paddock as evidenced by the performance of Mitre. High soil nitrogen levels resulted in protein levels too high for the noodle varieties to achieve their ASWN potential for all plots at the site except Lorikeet with no urea at sowing.

Harvest contrac prices can be high, and depend on the quality of the windrows.

• 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.

The main messages from BCG work are presented in this report.

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.

The main messages from the trial work undertaken in 2005 for nutrient management in 2006 are summaried in this report.

In a year with an outlook of a dry finish and lack of grain fill due to limited moisture, high temperatures or frost, the ability to take advantage of early crop growth through oaten hay is a reasonable risk management tool to consider.

High yielding export quality oaten hay crops were successfully grown in the Charlton district (Echidna yielded 6.5 t/ha dry matter) in the 2001 season.

Oaten hay production is an opportunity to intensify the cereal proportion of a cropping rotation without increasing root disease burdens provided a CCN resistant variety is grown. With current prices of $120-140/t oaten hay production is a viable option.

• 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.

Brassica juncea, a canola quality mustard, is being developed to meet canola standards so that it can be received with canola and marketed under the same streams. To be canola quality, mustard must meet the <2% erucic acid level and the <30 micromoles/g meal level, as well as have high oleic acid levels. The three lines tested at Birchip, JN004, JO006 and JP056, have appropriate erucic acid levels, and are well adapted to the low rainfall environments.

• 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.

• There is now 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.
• This means that good risk managers need to consider both climate variability and change in their on-farm plans in order to ensure future sustainability.
• Many of the actions required for adapting to climate change are extensions of those currently used for managing climate variability.

The response to nitrogen in these trials should encourge the application of urea for wheat crops in these regions when the deep soil N test shows that the soil is low in available N prior to sowing in relation to the target yield set for the crop.

Phosphorous fertiliser is rapidly fixed into unavailable forms after sowing when the soil wets up in winter. There were no phosphorous fertiliser responses in a wide range of crops on sites with good fertiliser histories. At the Donald site, which has a poor fertiliser history, the phosphorous responses were significant, especially for the pulse crops, less for barley, and none for wheat.

Fertiliser P trials were undertaken on wheat, barley, canola, field pea, lentil and faba beans at four sites over two seasons (1999 and 2000). Fertiliser P is rapidly fixed and becomes unavailable to plants on neutral to alkaline soils. P responses over the two seasons indicate that for wheat, barley, canola and field pea the responses to P fertiliser were insignificant or if a response did occur it occurred from 0 to 6 kg P/ha. It appears that faba beans do respond to higher rates of P (up to 18 kg P/ha), which was a consistent result in both years. It is not clear how lentils respond to P fertiliser. It is recommended to base a P fertiliser application rate on:

• long-term P balance (P fertiliser applied minus the P exported in grain),
• soil test result (soil P test of above 15ppm Colwell appears to indicate adequate Phosphorus levels), and
• whole farm expenditure (not more than 10 to 12% of gross farm income expenditure on fertiliser (inclusive of N and S) - as an average of a minimum of 5 years).

• Phosphorus response trials were undertaken on barley, wheat, canola, lentils, faba beans and field peas at four sites across the Wimmera and Mallee over the past three seasons.
• There was no consistent response to the rate of phosphorus applied in wheat, barley, canola, lentils and field peas on sites that had a good fertiliser history (a positive P balance) and good P fertility (Colwell P of 15ppm or more). Faba beans were the exception responding to higher rates of phosphorus (up to 18 kg P/ha) – this was a consistent result over the 2000 and 2001 seasons.
• At the Donald sites, phosphorus rate significantly increased yield. This result was not unexpected as the trials were typically located on soils that were low in fertility (Colwell P <12ppm) and acidic (pH BBwaterB = 6.3).
• Reducing phosphorus inputs to between 6 and 12 kg P/ha will not compromise short-term soil fertility and crop production on sites with good fertiliser history and soil P fertility but further research needs to be conducted investigating the long-term implications of this strategy.

• Phosphorus response trials were undertaken on barley, wheat, canola, lentils, faba beans and field peas at four sites across the Wimmera and Mallee over the past three seasons.
• There was no consistent response to the rate of phosphorus applied in wheat, barley, canola, lentils and field peas on sites that had a good fertiliser history (a positive P balance) and good P fertility (Colwell P of 15ppm or more). Faba beans were the exception responding to higher rates of phosphorus (up to 18 kg P/ha) – this was a consistent result over the 2000 and 2001 seasons.
• At the Donald sites, phosphorus rate significantly increased yield. This result was not unexpected as the trials were typically located on soils that were low in fertility (Colwell P <12ppm) and acidic (pH BBwaterB = 6.3).
• Reducing phosphorus inputs to between 6 and 12 kg P/ha will not compromise short-term soil fertility and crop production on sites with good fertiliser history and soil P fertility but further research needs to be conducted investigating the long-term implications of this strategy.

• Phosphorus response trials were undertaken on barley, wheat, canola, lentils, faba beans and field peas at four sites across the Wimmera and Mallee over the past three seasons.
• There was no consistent response to the rate of phosphorus applied in wheat, barley, canola, lentils and field peas on sites that had a good fertiliser history (a positive P balance) and good P fertility (Colwell P of 15ppm or more). Faba beans were the exception responding to higher rates of phosphorus (up to 18 kg P/ha) – this was a consistent result over the 2000 and 2001 seasons.
• At the Donald sites, phosphorus rate significantly increased yield. This result was not unexpected as the trials were typically located on soils that were low in fertility (Colwell P <12ppm) and acidic (pH BBwaterB = 6.3).
• Reducing phosphorus inputs to between 6 and 12 kg P/ha will not compromise short-term soil fertility and crop production on sites with good fertiliser history and soil P fertility but further research needs to be conducted investigating the long-term implications of this strategy.

• Lentils were better at establishing and reaching target plant densities than canola.
• Canola was considerably more responsive to converting increasing sowing densities into yield than lentils.
• Seeder type had no consistent effect on establishment and yield.
• The differences in yield response to plant numbers suggests that it is more critical to get it right in canola than lentils.

• Once you have decided on how much crop to put in, the greatest impacts on your bottom line will come from how you managed the crop and what it cost you.
• Making in-crop decisions on inputs has to be done in context of the likley yield.
• Yield Prophet will help you make better decisions.

Nufarm are currently developing a new controlled release formulation of Triflualin.

There are two main forms of ‘precision agriculture’: guidance, to improve accuracy, decrease overlapping, improve efficiency etc (the benefits are well understood for guidance); and variable rate agriculture. Variable rate agriculture

The selection of a herbicide in newly sown pasture is a metter of required weed control, level of acceptable damage to the pasture and cost.

Lathyrus stood out as a good producer of dry matter when sown early. It also appears to be less affected by insects and more tolerant to post emergent herbicides compared to Morava vetch.

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.

• August pasture termination may produce water and nitrogen benefits for the following crop, compared to leaving the pasture to grow, but these may be neutralised by dry summers and other limitations in an average growing season.
• Termination timing is only as important as you abiliy to capitalise on the benefits with either livestock (extra pasture growth) or crop (extra water and nitrogen).

• Alkaline, calcareous, sandy soils in low rainfall (300-350mm annually) regions can support a wide range of pasture species.
• Cereals and grain legume varieties provided the highest volume of production in low rainfall years such as this year.

• Establishment of perennial pastures is relatively expensive and represents a high risk activity during years with very low spring rainfall. • Ideally Lucerne and pasture grasses should be established by sowing early in paddocks with low weed populations, such as may occur after several years of a well managed cropping program.
• Press wheels will improve establishment in some soil types.Establishment of perennial pastures is relatively expensive and represents a high risk activity during years with very low spring rainfall.
• Ideally Lucerne and pasture grasses should be established by sowing early in paddocks with low weed populations, such as may occur after several years of a well managed cropping program.
• Press wheels will improve establishment in some soil types.

• 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.

• Of the conventional varieties: Outback (1.2t/ha), Emblem (1.1t/ha) and Rivette (1.3t/ha) performed the best at Berriwillock in 2003.
• The triazine tolerant (TT) lines that yielded highest in this trial were Surpass501TT (1.1t/ha) and Beacon (1.0t/ha). Eyre, a TT variety performed poorly at 0.7t/ha.
• The Clearfield line that performed very well in the trial was Pioneer 45C75 (1.3t/ha).
• In the Wimmera, monola is worth keeping an eye on as a niche crop as it performed similar to, if not slightly better, than some canola varieties and receives a premium of $40/t on delivery.

• Starter application of P was important in maximising yields at GS30.
• Grain yield responses (< 90 percent relative yield) to P were obtained for 35 percent of the paddocks surveyed.
• DGT accurately predicted wheat responses to P accounting for 64 percent and 79 percent of the variation in early dry matter and grain respectively.
• Colwell P could only explain 36 percent of the variation in early dry matter and no significant relationship could be obtained with grain.
• Colwell P plus the Phosphorus Buffering Index (PBI) correctly predicted wheat response in 60 percent of the sites.

Wheat yields in 1997 were generally below average to average across the Wimmera, Mallee, Central and North Eastern cropping zones.

Phenoxy herbicide rates and application times are generally based on crop leaf number. This however, does not take into account the fact that varieties with different maturity lengths will differ in leaf number ie. shorter season wheats generally produce less leaves than long season wheats.

A significatn yield increase was observed on the Barber site from the application of 10kg P/ha compared with the zero and 5kg P/ha treatments.

• Different crop types displayed varying phosphorus (P) use efficiencies (soil and fertiliser demand) under P deficient conditions.
• Crop types that have previously shown to be P efficient did not display the same traits in neutral to slightly alkaline soils.
• Soil testing can have significant economic benefits if the right test is used.

• Phosphorus is an essential nutrient for plant development which cannot be effectively applied post sowing. Because of this it is imperative that decisions on its application are made now.
• P should be applied at rates necessary achieve the yields being targeted in a given paddock for a given year.
• Information to assist you in determining how much P is in your soil includes fertiliser history, removal through production previous yields, soil tests and paddock history.

• In 2003, a three week delay in sowing after mid/late May resulted in a 0.3t/ha (Murtoa) and 0.5t/ha (Birchip) yield penalty.
• Further delay in sowing (to July) caused similar decreases in yield.

 

• On light soils, nitrogen is generally the most important nutrient in achieveing optimum cereal yields and maximising return.
• It is important to maintain a balanced approach to crop nutrition.
• In deficient sandy soils, nitrogen can be confidently applied to malting barley, particularly if applied early and to crops free of disease and weed competition.

• 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.

Previous trials and demonstrations have highlighted zinc deficiencies in both cereals and pulses, which could provide farmers substantial profits over the cost of zinc. A trial conducted on wheat at Sea Lake in 2000, on a highly responsive soil type with a poor zinc history clearly defined responses to zinc and demonstrated that responses to phosphorus or nitrogen cannot be achieved if zinc is deficient. This trial also endorsed the conclusions of trials conducted in 1999 that adequate zinc enriched granular fertiliser should be regularly applied

The 2002 season has failed for many cropping farmers in the north-west of the State. Some will harvest seed, but in many areas even that will not be possible. It is now time to start planning for 2003 to minimise the risks of failed crops in the coming season. Assuming that it will rain next year, we must ensure that we have the right cropping mix, that there is no legacy of residual herbicides and no cost blow outs.

Throughout the eastern Australian grain belt the 1994 season has now been confirmed as one of the worst Winter growing seasons ever.

In 2014 – a dry season with limited growth and yield at the trial site – Plant Growth Regulators (PGRs) were not economically viable or worthwhile.

PGR use in a tough season may pose more risk than benefit to cereal crops; their use should be gauged on seasonal outlooks.

In 2014, reduction in plant height was greatest with a PGR applied either as a single late, or a split application, not an early application.

The combination of a fungicide such as Amistar Xtra with a PGR such as Moddus Evo, appears to increase the effect of the PGR on plant growth.

Late application and/or higher rates of clethodim pose a high risk to canola yields. Split applications at lower rates do not appear to cause as much damage as a single higher rate. Varieties appear to differ in their tolerance of high rates, but further investigation is required.

The polymer coated canola had very poor germination, even after 60 mm of rainfall in the month post sowing. More work needs to be done on the coating thickness and cost before polymer coating could be considered as an early sowing tool in our growing conditions.

• Biodegradable polymer films retain soil moisture and increase soil temperature.
• Polymers allow crops to be grown out of season and expand the planting window.
• Sorghum and millet successfully germinated under the film failed to germinate in the absence of the film.

• This trial is a joint project between the Birchip Cropping Group (BCG), the Cooperative Research Centre (CRC) for Polymers and Integrated Packaging.
• Due to seasonal conditions there were no yield or quality results obtained from this trial in 2006.

• Field data from 2007, as well as modelling data, has shown that there is an optimum time to remove the polymer film before it gets too hot under the film resulting in a reduction in yield.
• A low cost structure is required to make polymer film economically viable, however there seems to be good initial results when using polymers to establish native tree species. There is potential that polymer film may have a future with perennial species (salt bush establishment etc) more so than with annual species due to the high cost of laying the film each year with annual crops.

Broadstrike Herbicide with or without wetter and Broadstrike + Brodal all provided commercially acceptable control of wild cabbage in lentils without causing crop damage. Warm, sunny conditions at spraying resulted in good Broadstrike activity. The late finish to the growing season also suited Broadstrike mixes, as the delay in crop maturity resulting from Broadstrike application did not reduce yield. These results need to be verified in other environments.

Diuron at 1L or 2L applied post sowing pre-emergent in a wheat crop was not effective in controlling fop and dim resistant ryegrass. However, Diuron with Dual Gold or Dual Gold on its own (especially at the 0.5L rate) had better control of ryegrass. The level of control was not sufficient in a commercial sense but it may be in combination with trifluralin or with other ryegrass control strategies. Dual Gold is a Group K herbicide and will not initially add to a resistance problem.

For discussion please see the attached trial report.

Two species of root lesion nematode occur in cropping regions of southern Australia: both species cause root damage and yield loss.

• Residual control of herbicides applied before crop emergence was not effective for short to medium term control or suppression of radish.
• It appears that in-crop control techniques are more effective.

• Group D herbicides should not be used alone – it is important that resistance to this very important group of herbicides does not develop.
• There was no difference in yield between the trifluralin in mixes with metribuzin, diuron or avadex applied; however there was a reduction in ryegrass heads at flowering due to the addition of Dual Gold (metolachlor) to trifluralin.

Trifluralin use has increased in the last decade and the threat of ryegrass developing resistance to group D herbicides (including trifluralin) is real, already occurring on some farms. In this trial a number of herbicides with activity on ryegrass were tested as mixes with trifluralin on their efficacy in controlling ryegrass as well as on grain yield.

• Group A resistant ryegrass populations are becoming more prevalent across south Australia, increasing the reliance on the use of Group D (trifluralin) for ryegrass control.
• Group D resistance will develop if trifluralin is consistently used without other control practices.
• Trifluralin used in combination with other herbicides such as Avadex Xtra (Group E) and Dual Gold (Group K), may enhance ryegrass control and could prolong the onset of Group D resistant ryegrass populations.

• Barley is more susceptible to sprouting than wheat, which may require more rainfall (>50mm) for sprouting to occur.
• Protection against sprouting (seed dormancy) reduces following maturity; all varieties will become more susceptible the longer they are left standing in the paddock.
• Grain quality diminishes with delayed  harvest and multiple rainfall events.

Crop dry matter at maturity and grain yield were significantly higher in the ‘High Yielding’ zones than in the ‘Low Yielding’ zones.

The forecasting models also have potential to significantly improve production levels in other agricultura, pastoral and horticultural industries.

The important message from these trials is that any post seeding treatment is better than none at all.

• Unlike wheat, higher seeding rates in malt barley may have a detrimental impact on grain yield and quality. This is particularly the case for Schooner (lower yields) and Vic Sloop (higher screenings).
• The exception to this rule may be Gairdner. Higher plant densities had no impact on yield or grain quality so increasing seeding rates in this variety may be a management tool available to compensate for its poor early vigour.

• Previous BCG results indicated that higher plant densities achieved by increasing seeding rates provided many benefits including stable or increased yields (never a yield penalty), reduced screenings, increased access to moisture, nutrient and light and better competition against weed populations.
• The results of this trial support the findings of previous BCG research.
• For many growers seed of their preferred variety may be in relatively low supply following the 2002 drought but it will be important to maintain or increase current seeding rates in 2003.

The 1998 season in the southern mallee of Victoria was characterised by an early break, a dry winter and spring, and severe frosts in October.

• The effect of sowing dates and rates on lentil, field pea and chickpea cultivars was investigated. The only experiment that was harvested was field peas; yields ranged from 0.2 to 0.7t/ha.
• The lentil and chickpea trials were not harvested due to the drought conditions. Similar trials were also conducted at Rupanyup, but were not harvested due to the drought and several frosts.

• Chickpeas - New ascochyta blight resistant varieties of chickpeas continue to offer great promise, but the 2006 drought severely reduced seed availability for 2007. Large seed production areas are planned for 2007 and large quantities of seed should be available in 2008 of all chickpea varieties listed below.
• Fieldpeas - Varieties Sturt and Bundi (limited seed supply) will be available to growers in 2007. Both provide yield advantages over Kaspa. New early flowering Kaspa type field pea varieties have been identified and will be available to growers by 2009-10.
• Lentils - The 2006 drought has delayed the release of Nipper to growers until 2008. The green lentil Boomer will also be released in 2008 and offers an opportunity for development of a green lentil industry in Victoria.

PBA Striker has a good fit in Mallee rotations, but ascochyta needs to be more carefully managed than with resistant varieties like PBA Slasher and Genesis 090. Early sowing was still beneficial for all pulses, but particularly lentils, despite the dry start. PBA Percy and PBA Gunyah are showing good potential for the Mallee, as is PBA Wharton.

Sea Lake was extremely poor and the vetch was unharvestable. Laura fieldpeas yielded 1.01t/ha, respectable for the season.

Post sowing pre-emergent and early post emergent herbicide applications all reduced radish numbers but not sufficiently to be commercially acceptable. High rates of triazines were more effective in controlling radish and were quite well tolerated by the broadleaf lupins in this trial. For effective control of radish in lupins, a post sowing application of triazine followed by a post emergent application of either Brodal or Eclipse is required.

Post-sowing pre-emergent treatments were not active enough to reduce a large radish population to a commercially acceptable level. Early post emergent treatments were more effective in reducing radish populations to a manageable level but did not eliminate the radish problem. Product mixes containing Brodal were the most effective in controlling to low levels quite a dense radish population.

• Frost and heat shock events can cause significant damage to grain crops during flowering and grain filling.
• To reduce the risk of frost or heat events reducing yield, it is advisable to sow different varieties with different maturity lengths right through the sowing window to ensure that not all he wheat sown on hte farm flowers at the same time.
• An alternative practice would be to sow a mix of two different maturity length varieties in the same paddock. 

Ally applied as per label recommendations with a 9 month plant back period for pulses and canola grown on alkaline soils did not appear to have a negative effect on the growth of chickpeas, field peas, lentils, faba beans and canola.

Residual herbicides can be an effective management tool in providing an extended period of weed control but careful consideration must be given to potential crop selection limitations, or crop loss, that their application may impose.

• P fertilisers applied in 2006 did not improve grain yield in 2007, even at the high P rate (18 kg P/ha).
• In terms of residual value, there was no difference between granular and fluid P.
• 2007 applied fluid P (TGMAP) at 6 kg P/ha increased dry matter at GS30 from fresh granular P and control treatments.
• Soil testing is a useful tool for estimating P status in the soil.

• Significant increases in dry matter at GS30 were found in wheat. Fluid P increased dry matter from the control by 49%, whereas only 19% increase was found when P was supplied as a granule
• There was an increase in dry matter from the application of P for both Barley (20%) and Oats (35%). There was no difference in dry matter between the granular and fluid products.
• There was no difference in terms of grain yield from P application compared to the control of each crop type.

• There are no significant differences between average yields for different levels of applied gypsum in the trial in 1995.
• There are also no significant differences between average yields for the different tillage treatments.

Details of the experimental design and management of crops and sprays can be found in hte 1994 BCDS Field Day Manual.

The hybrid canola 44Y84 (both certified and retained generations) yielded better than the open-pollinated variety 43C80, by an average of 0.3t/ha (20%). The hybrid established better than the OP variety. On average, 40% of seeds established as plants and plant densities above 20 plants/m2 maximised grain yield. The use of certified seed for both open-pollinated and hybrid canola did not increase yields compared with retained seed for both hybrid and open-pollinated. However, view results with caution as the variability within the trial was high.

Retaining hybrid canola from one season to the next incurred a yield penalty of 0.3t/ha at Quambatook. There was a general penalty of 0.2t/ha for retained seed in the mean yield of all varieties (including OPs) at Horsham. Oil content and test weights of retained seed were lower at Quambatook, but not at Horsham. Retaining hybrid seed compromises plant vigour, disease resistance and herbicide tolerance. The yield advantages (0.2-0.3t/ha) from hybrid varieties, particularly within the Clearfield hybrid varieties, significantly outweigh the initial seed cost of $44/ha at 2kg/ha sowing rate.

Due to the dry season, there were no visible differences in crop growth and yield resulting from different seed treatments.

The results in this years risk management trial emphasised the importance of knowing:

• the nutrient status of your soils prior to sowing, and
• potential of the soils. The starting soil nitrogen at Birchip was particularly low (55kg/ha N) resulting in a significantly lower yield for the Low Input scenario compared to the High Input and Best Bet treatments.

The Low Input scenario also resulted in significantly lower protein and significantly higher screenings. These results suggest that there was not enough nitrogen to sustain a crop even in a dry finish, eventually affecting the final gross margin of the Low Input system.

• BCG risk management work between 2005 and 2008 has shown a low to moderate input approach to be the most profitable • Adopting a low input approach to managing variable inputs was the most economic at Curyo in 2008.
• No economic yield or grain quality response was achieved by adopting a high input strategy.
• Tools such as soil sampling and Yield Prophet® can support fertiliser and in-crop input decisions.

BCG research from 2005 to 2008 has shown that adopting a low to moderate approach to inputs has been the most profitable • Adopting a low input approach to managing variable inputs was the most economic at Manangatang in 2008 • Soil sampling at the start of the season is very valuable in determining soil nutrient status.

The drought and subsequently paddocks with failed crops present an interesting dilemma for many growers. Should the rotation continue as planned or can the same crop type be resown on those paddocks that failed? In the case of cereal crops root disease will present the greatest threat.

• Medics appear susceptible and very intolerant to P. neglectus.
• Of the medics tested, Harbinger is the most tolerant.
• Although moderately intolerant to P. neglectus, Herald is a high yielding medic.
• Rotations including medic and wheat result in higher nematode numbers.

 

Krichauff, Excalibur and triticales are consistently both more tolerant and more resistant to P. neglectus that other cereals in field trials.

• In a dry season, there was a small grain yield benefit (90kg/ha) for wheat that followed terminated vetch and field peas (1.5-2.4t/ha of biomass), compared with fallow and terminated medic.
• Soil water benefits from fallow and legume termination don’t occur with dry spring finishes.
• Using soil tests to measure nitrogen mineralisation helps you to properly evaluate the benefit of a legume crop or pasture in a rotation.

A drift demonstration was set up at the BCG Main Field Day site. Different nozzles which delivered different droplet sizes, two travel speeds, a boom height above the recommended level and wind speed at 15km/h did not result in significant drift. This is probably due to a relatively high Delta T of 5, a set of conditions that occur when small droplets evaporate before they can cause much damage. The windy conditions also caused turbulence resulting in a lower likelihood that droplets would be deposited on a susceptible plant.

• Cereals and lentils are best suited to sowing with narrow rows (23cm or less).
• Faba beans performed best on wide row spacings (36cm).
• Row spacing appeared to make little difference to other broadleaf crops such as canola and other pulses.

• VB 0021, Gairdner, Quasar and Baudin yielded the highest at this site however quality analysis shows that, of these high yielding varieties, only Gairdner achieved malt quality - VB 0021 and Baudin had a low protein content (<9.0%), while Quasar had low retention (<70%).
• This result for Gairdner is surprising given the number of crops in the district that did not make malt quality due to low retention or low protein.
• Of the three lowest yielding varieties: Sloop Vic, Galaxy and Schooner, only Schooner had quality parameters acceptable for Malt 1 quality.
• There was no yield advantage at this site from the boron tolerance present in Sloop Vic. To gain the greatest potential from Sloop Vic it should be sown in areas with medium rainfall where boron is suspected to be affecting yield.