• Majority of the pre-emergent herbicides and herbicide mixtures registered 88-100% weed control efficiency against wild radish. Post-emergent application of flumetsulam 800 at 25g/ha alone at 4-5 node stage of chickpea reduced wild radish number by 86%.
• Interaction of post-emergent flumetsuam with pre-emergent herbicides/mixtures for wild radish control was positive, whereas for chickpea seed yield it was negative in majority of the cases.
• Pre-emergent application of flumioxzin alone and in mixture with other herbicides, BADPI21 and simazine + diuron + isoxaflutole caused 21 to 41% loss in chickpea seed yield.
• Pre-emergent application of fomesafen, flumioxazin, terbuthylazine + isoxaflutole, and simazine + diuron + isoxaflutole had no significant negative effect on root nodules of CBA Captain.

• PBA Amberley which is rated MR to chocolate spot did not respond to fungicides at Wittenoom Hills when crop humidity was low in 2021.
• Using in-crop sensors which send data wirelessly in real time may provide a useful guide to help spraying decisions – particularly when not to spray fungicides.

• Overall yield from May 17 sowing was impressive for this AgZone, at 1.6 t/ha.
• Delayed sowing by 34 days, to June 20, led to 1042 kg/ha less yield – 30 kg/ha/day.
• Short season hybrids could extend the safe sowing window later in this environment.
• Difficulty establishing canola in hot conditions could limit how far the sowing window can be brought forward.
• To take advantage of early autumn rains in this environment larger seeded broadleaf species that can be sown deeper should be tested.

• Yield were impressive; 1.9t/ha from April 26 and 2.2t/ha from May 17.
• Mid-season maturity varieties showed the greatest plasticity in plant development across sowing dates and may be a good option over a wide sowing/establishment period.
• Short season hybrids may enable the sowing window to be extended later with reduced risk.
• Long season varieties yielded poorly from these sowing dates.

• Yields were relatively stable across sowing times ranging from 2.2 to 3.1 t/ha.
• Early and mid-season hybrid varieties out-yielded the open pollinated varieties of the same season length.
• These hybrids combine early flowering, high biomass and in some cases a long flowering period.
• In general varieties had substantial plasticity and growers may be able to use a few varieties across a wide range of emergence dates; this is important if pre-ordering hybrid seed and/or dry sowing.

• Canola yield increased up to 17% when plants were spaced evenly apart compared to the spacing observed in commercial paddocks.
• Lupin yield improved up to 7% when plants were spaced evenly apart, but this was not statistically significant.
• Moving towards improved plant spacing without achieving perfect spacing is likely to improve yield.

• Over the longer term PBA Hallmark XT has outperformed PBA Hurricane XT and growers interested in IMI tolerant lentils are encouraged to try this variety on their farm

• Timely harvest can make a big difference to yields when lentils produce high biomass. • Over the longer term PBA Hallmark XT has outperformed PBA Hurricane XT and growers interested in IMI tolerant lentils are encouraged to try this variety on their farm

• PBA Hallmark XT – the new imi tolerant variety released in 2018 –performed well at Mingenew matching the yield of all other released varieties.
• Over the longer term PBA Hallmark XT has outperformed PBA Hurricane XT and growers interested in IMI tolerant lentils are encouraged to try this variety on their farm.

• One or two well timed fungicide applications increased yield 10% and full control a further 15%.
• Newer fungicides were more effective at supressing ascochyta but this did not translate to increased yield.
• Further testing of new fungicides is required in more locations and seasons.

• One or two well timed fungicide applications increased yield 10% and full control a further 15%.
• Newer fungicides were more effective at supressing ascochyta but this did not translate to increased yield.
• Further testing of new fungicides is required in more locations and seasons.

• At Cunderdin in 2018 hybrid TT’s sown at the same target density produced similar yields to OP TT.
• With low seed costs, ATR Bonito retained for 2, 3 or 4 years produced equal highest gross margins of over $600/ha - Comparable to the high yielding hybrid Nuseed HyTTech Trophy.
• Retaining ATR Bonito seed ‘on-farm’ for 1, 2, 3 or 4 years produced similar yields, oil and higher gross margins than purchasing new OP seed.
• At our three sites in 2018, using ATR Bonito seed stored for 4 years produced plants lacking in vigour and overall poorer performance than growing out and retaining seed each year or purchasing new commercial seed.

• At Grass Patch in 2018 hybrid TT’s produced higher yields and gross margins than most of the OP TT canola variety ATR Bonito treatments.
• Retaining ATR Bonito seed ‘on-farm’ for 1, 2, 3 or 4 years produced similar yields, oil and higher gross margins than purchasing new OP seed.
• Using ATR Bonito seed stored for 4 years produced plants lacking in vigour and overall poorer performance than growing out and retaining seed each year or purchasing new commercial seed.

• At Merredin in 2018 the OP TT canola variety ATR Bonito produced similar yields and higher oil than hybrid TT’s.Retaining ATR Bonito seed ‘on-farm’ for 4 years produced similar yields, oil and financial returns to purchasing new seed.
• Using ATR Bonito seed stored for 4 years produced plants lacking in vigour and overall poorer performance than growing out and retaining seed each year or purchasing new commercial seed.

• Farmers can continue to use retained OP seed for at least three years.

NDVI taken June 13 and July 11 showed no treatment differences.  Similarly we found no significant treatment effects on seed yield, oil, oil yield or gross margins in this experiment.  The surrounding crop was also of adequate density and in contrast to some years in this region the farmer did not have any low density areas on his farm.  Thus we did not really have conditions similar to those reported by the farmers in previous years and the experiment did not add to our knowledge base. 

PBA Bolt is a good first choice for Esperance lentil growers, with PBA Ace an option for early sowing or longer seasons. The new XT line CIPAL1422 performed well and may be a valuable alternative to PBA Hurricane XT for those growers wishing to use imazethapyr (e.g. Spinnaker®) or facing SU carryover issues.

PBA Samira was the highest yielding released faba bean variety at Wittenoom Hills.

• Agronomic management of canola changes considerably when sowing very early.
• There was a large yield benefit from establishing canola in mid-vs late April of approximately 40 kg/ha/day but the additional benefit of sowing in late March vs mid-April was only about 10 kg/ha/day.
• Climatic and agronomic risks increase with early sowing.

• At Grass Patch in 2016 there was no response to fertiliser applications of K, S and micro nutrients. 
• There was a yield response to P and N.
• Considering the costs of inputs, the lowest cost treatment which provided equal maximum gross margin was to apply only superphosphate at sowing – equivalent to 9 kg P/ha.
• In this region farmers typically apply either superphosphate plus N or a compound fertiliser at sowing and top-up N at 4- 6 weeks after sowing.  This approach in this experiment would have had higher up front input costs, did increase yield but did not lead to higher gross margins.  But the farmer approach also is a more balanced nutrient approach, in that nutrients are replaced to balance out nutrients removed in the seed.

• New varieties have improved ascochyta resistance, but still need careful management.
• Avoiding early infection is critical to managing ascochyta effectively.
• A two spray fungicide strategy will provide reliable control.

Farmers can safely retain OP seed for at least two years

Retained and graded hybrid TT seed had lower % establishment, variability in flowering, higher % of sterile flowers, lower oil and yield – but in this environment with yields below 1.5 t/ha the effects were not large enough to reduce gross margins compared to purchasing hybrid TT seed.

Farmers can safely retain OP seed for at least two years

Retained and graded hybrid TT seed had lower % establishment, variability in flowering, higher % of sterile flowers, lower oil and yield – but in this environment with yields below 1.5 t/ha the effects were not large enough to reduce gross margins compared to purchasing hybrid TT seed.

• Even when sowing in April, into drying soil, establishment of canola was better at 1 cm compared to 3 or 7 cm.
• Sowing small OP seed deeper, at 3 and 7 cm, resulted in the poorest establishment and yield.
• In difficult conditions hybrid seed was better able to establish than OP canola.

• Even when sowing in April, into drying soil, establishment of canola was better at 1 cm compared to 3 or 7 cm.
• Sowing small OP seed deeper, at 3 and 7 cm, resulted in the poorest establishment and yield.
• In difficult conditions hybrid seed was better able to establish than OP canola.

• There was a trend of more yield from evenly spaced plants compared to unevenly spaced plants with a 5% improvment at lower plant densities, however this was not statistically significant.
• Spacing plants more evenly did affect some aspects of plants growth.
• Canola yields were above 2.5t/ha from low plant density, 10 plants per square metre

• Early sowing is the key to maximising canola yield in the northern region;
• Delaying sowing by 15 days after March 31 led to 195kg/ha less yield – a loss of 13kg/ha/day.
• When sowing in March at Wongan Hills the mid and mid/late maturity varieties performed best.
• When sowing in mid-April early and early/mid maturity varieties performed best.

• Agronomic management of canola changes considerably when sowing very early.
• There was a large yield benefit from establishing canola in mid-vs late April of approximately 40 kg/ha/day but the additional benefit of sowing in late March vs mid-April was only about 10 kg/ha/day.
• Climatic and agronomic risks increase with early sowing.

• Across the trial series at Grass Patch, Ballidu, Merredin and Holt Rock the highest grain yields, oil and gross margins were from the open pollinated variety, so growers should continue to use open pollinated TT varieties in the low rainfall regions, rather than hybrid varieties.
• In the hybrid treatments, there were generally increased yields and oil from the purchased (F1) seed, compared with the retained (F2) seed.  The gross margin was only significantly better at the Grass Patch site, for the 2014 F1 compared with the retained seed. Grading to increase seed size and sowing at a target density of 40 plants/m² improved the yield and gross margins of F2 retained hybrid seed, but at Grass Patch in 2015 using F1 hybrid seed or OP seed provided better results..

Early sowing is the key to maximising canola yeild in the Northern Agricultural Region (NAR) All varieties yielded less when sown on April 29 compared to April 14 Yield loss was on average 43kg/ha per day between April 14 and April 29th sowing Using the highest yeilding variety rather than trying to match variety maturity to sowing date was the best option.

• Early sowing is the key to maximising canola yield in the Northern Agricultural Region (NAR)
• All varieties yielded less when sown on April 29 compared to April 14.
• Yield loss was on average 43 kg/ha per day between April 14 and April 29 sowing.
• Using the highest yielding variety rather than trying to match variety maturity to sowing date was the best option.

• The Podguard line AN14R9012 appears to be a viable option for direct harvesting and delayed harvesting of canola.It does not appear to shed seeds from pods to the same degree as other varieties.
• Under extreme conditions AN14R9012 can drop whole unopened pods and therefore lose yield.

• 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.

• Heavy infestation of aphids caused significant yield loss to canola in a high rainfall environment.
• The length of cabbage aphids on spikelets at flowering was directly proportional to yield loss.
• The function yield (kg/ha) = -141x + 1114 where x= spike length colonised in cm explained yield loss R2 0.9.
• Aphid colonisation also reduced seed quality: oil content and seed size.

In this 2015 trial;

• Economic response plateaued at 75 kg N/ha – lower than grain yield (125 kg N/ha)
• Nitrogen applications at 12 and 14 weeks produced similar canola responses to N applied earlier in the year – but no added benefit.
• OP TT and hybrid RR varieties had a similar response to nitrogen timing and rate.

 

• Amira albus lupin is a good break crop option for high and medium rainfall areas of the northern region
• Albus lupin grown in 44 cm rows yielded 81% of 22 cm rows.
• Maintaining a high seed rate maximised yield at both 22 and 44 cm row spacing’s.
• In dry conditions fungal disease were not evident, therefore we could not assess the impact of row spacing and density on foliar diseases.

• Most canola had acceptable losses prior to harvest, even with delayed harvest.
• The greatest proportion of losses occurred at harvest.
• The podguard variety IH51RR had significantly less losses than other varieties both before and at harvest.

• RR hybrid canola maximised gross margins
• OP TT variety Sturt produced similar gross margins to the hybrid TT variety Hyola 450 TT
• Gross margins were optimised at:

             ~ 50 plants/m² for Sturt TT.

                5 to 25 plants/m² for Hyola 450TT.

              ~ 13 plants/m² for Pioneer 43Y23 RR.

 

Canola yields in low and medium rainfall regions of south-western Australia are inherently low and variable.  We have shown that although N fertilisation increases the yield of canola, the yield increases are often relatively low.  Nitrogen also reduces the concentration of oil in the seed of canola and the rate of decrease can be rapid in low rainfall areas. 

The combined effect of N on yield and oil, along with the current payment structure for high oil canola, results in uncertain economic returns from N fertilisation in low to medium rainfall areas. 

We found that 90% of maximum gross margin was achieved at an average nitrogen rate of 17 kg N/ha, and the first 10 kg N/ha gave a return on investment in N greater than $1.50 per $1 in 80% of occurrences (experiments x variety combinations).  The next 20 kg N/ha applied gave a return on investment in N of $1.25 for every $1 spent on N in 80% of occurrences, and further increases were most likely to breakeven. 

We have shown that while farmers should continue to plan to apply N onto canola within the first eight weeks, delaying top-up N until 12 weeks after sowing – when the canola crop is near flowering, is a viable second option which provides some level of risk management for canola growers in low and medium rainfall areas in south-western Australia.

• We observed no significant differences in grain yield (GY) between any treatments due to low yield potential and reasonable soil nitrogen (N) levels at seeding.
• Timing of N application had no effect on GY. This is consistent with last years’ results at Wubin.
• Canola oil percentage decreased as N rate increased. High rates of N reduced oil significantly, consistent with last year at Wubin.
• The higher the rate of N the more rapidly oil percentage reduced, consistent with last year at Wubin.
• Gross margins (GM) decreased as N rates increased; all GM figures are negative due to poor GY, however, Sturt performed better than Pioneer 43Y23RR due to the higher seed costs associated with Roundup Ready (RR) seed.

• There were significant differences in grain yield (GY) between treatments (N kg/ha and timing), however, GY was particularly low in all treatments. 
• Total nitrogen (N) increased GY significantly up to 30kg N/ha.
• Canola oil percentage decreased as N rate increased. High rates of N reduced oil significantly.
• Applying N late (12 weeks after sowing (WAS) reduced canola oil percentage, however, not significantly.
• Gross margins decreased as N rates increased, but all gross margins (GM) were negative due to poor GY. Sturt had better gross margins than Pioneer 43Y23RR due to the higher seed costs associated with RR seed.
• Pioneer 43Y23RR produced higher GY at all rates and timings of applied N other than 10N seeding and 20N 12WAS.

The Cunderdin trial saw Pioneer 43Y23 (RR) perform better in terms of higher grain yield, oil yield and gross margins than Sturt TT, with both varieties producing similar oil %. Grain yield responded to applied nitrogen up to 30 kg N/ha.  As the rate of applied nitrogen increased the % oil in the seed of both canola varieties decreased at a rate of 0.02% oil per kg applied N/ha.  Gross margins also responded to nitrogen application up to ~ 30 kg N/ha after which further increases in nitrogen led to no further financial gain.  Overall when nitrogen was applied it did not alter the response to nitrogen of both varieties for GY, oil, oil yield and GM.   

• Grain yield responded to applied nitrogen up to 30 kg N/ha.
• Highest oil %, oil yield and gross margins were obtained with no applied nitrogen.
• When nitrogen was applied, did not alter the yield, oil or $/ha response to nitrogen of both varieties.
• Thus 30, 50 or 70 kg N/ha applied either in splits at seeding and 8 weeks or seeding and 12 weeks provided similar responses.

•  In a dry year, there was no economic response to applied N.  

• Pioneer 43Y23 (RR) perform better in terms of higher grain yield, oil yield and gross margins than Sturt TT, with both varieties producing similar oil %.
• Grain yield responded to applied nitrogen up to 30 kg N/ha.
• Maximum oil% was produced with no applied nitrogen.
•  Gross margins also responded to nitrogen application up to ~ 30 kg N/ha after which further increases in nitrogen led to no further financial gain.
• Overall when nitrogen was applied it did not alter the response to nitrogen of both varieties for GY, oil, oil yield and GM. 

• With grain yield of less than 400kg/ha, there was no grain yield response to applied N and no economic response to applied N.
• At ‘low rainfall’ N rates of 30 kg/ha top-up N at 12 weeks gave a similar response to top-up N within 8 weeks.

• With grain yield of less than 1 t/ha, there was only a small grain yield response to applied N and no economic response to applied N.
• Top-up N at 12 weeks gave a similar response to top-up N at 8 weeks.

• Pioneer 43Y23 (RR) had higher grain yield, oil yield (kg/ha) and gross margins, than Sturt (TT).
• Grain yield responded to applied nitrogen up to ~ 40 kg N/ha.
• Both varieties responded similarly to applied nitrogen with no variety x N rate interaction for grain yield. 
• Oil yield and gross margins did not respond to applied nitrogen.
• Timing of nitrogen application did not alter the response to nitrogen of both varieties for GY, oil %, oil yield or gross margin.

• Grain yield responded to applied nitrogen up to 70 kg/ha.
• Oil did not decrease as nitrogen rate increased, unlike what we have observed at other trials – probably a reflection of the continued grain yield response to N.
• Positive gross margin returns were seen at 40-70 kg/ha of applied nitrogen.
• Overall when nitrogen was applied did not alter the response to nitrogen – but avoid putting the majority of N at 12 weeks.

• Canola grown in wide rows (50-60cm) yielded well enough to consider this row spacing as an option.
• Canola plants were able to compensate for being sown in wide rows - biomass similar to narrow rows.
• We may be able to reduce input costs, seed and fertiliser by refining the production package in wide rows.
• Wide rows offer benefits of reduced fuel costs at seeding, easy stubble handling and safety of IBS herbicides.