• Four field trials in 2018 assessed the influence of plant density, nitrogen timing and grazing on yield and quality of three long maturing wheat varieties sown early April in Western Australia.
• Based on yield, Forrest and Longsword wheat varieties are more suitable for the early sowing opportunities in April than growing a mid winter (ie EGA Wedgetail) earlier.
• If there are establishment issues sowing in early April, there is generally no penalty if establishment is down to 50 plants/m². Some varietal specific responses were observed although these responses were also driven by nitrogen timing.
• For early April sown crops, delaying nitrogen application until stem elongation improved yields at Esperance, Katanning and Yuna.
• Grazing did reduce yields by up to 0.9t/ha depending on environment and variety choice, but could be achieved with minimal yield loss for some varieties and environments.

Match the maturity of a variety with sowing date to maximise biomass accumulation, flowering during the optimum time and maximise grain yield potential: – “If sowing early, sow long, or don’t sow wheat at all”.

• There is an opportunity cost and yield penalty of sowing short-mid season varieties too early (early to late April) in the central and southern production zones, similar to sowing mid-long season varieties too late.
• If sowing mid-April in the northern, eastern and southern wheatbelt without frost risk sow mid-long season varieties. If sowing in late May sow short-mid season wheats.
• If sowing in areas of frost risk in the northern, eastern and southern wheatbelt, don’t sow wheat in April, in early May sow mid-long season varieties in areas of low to moderate frost risk and sow areas of severe frost risk in late May to mid-long varieties.
• Highest yields at all sites have typically been achieved by mid-long maturing varieties sown from late April onwards, and short-mid maturing varieties sown in mid-May. At moderate to severe frost prone sites and with disease pressure, however, delaying sowing of mid-long maturities into mid-May, and the use of winter/long wheats when sowing in early to late April, is essential to minimise frost and disease risk.

• 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.

 Kowari and Williams yielded similarly, and out-yielded newly accredited variety Bilby  (breeding line 06204-16) (by 0.15 t/ha) and Carrolup (by 0.25 t/ha).

Bilby was the most sensitivity to increasing nitrogen, with N increasing from 0 to 60kg N/ha significantly reducing Bilby’s hectolitre weight.

 New variety Bilby  (breeding line 06204-16) out-yielded Carrolup (by 0.7 t/ha), but did not out-yield Williams , and had lower grain quality than Carrolup in grain quality. 

Similar to 2017, a mild finish to the growing season meant all varieties met Oat1 quality specifications, and agronomy had a reduced impact on grain quality.

 New variety Bilby  (breeding line 06204-16) out-yielded Carrolup (by 0.3 t/ha), but did not out-yield Williams, and was between Williams and Carrolup in grain quality. 

Similar to 2017, a mild finish to the growing season meant all varieties met Oat1 quality specifications, and reduced the response of varieties to changes in plant density and applied nitrogen.

 

• 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. 

• Lupin yielded 3.0 t/ha and canola 2.0 t/ha from late May emergence.
• Lupin gross margins were competitive with canola, and lupin gave the highest return on investment.
• For both lupin and canola variety selection was important, in particular Jurien lupin performed well from all sowing dates.

• Lupin yielded 3.0 t/ha and canola 2.0 t/ha from late May emergence.
• Lupin gross margins were competitive with canola, and lupin gave the highest return on investment.
• For both lupin and canola variety selection was important, in particular Jurien lupin performed well from all sowing dates.

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.