Abiotic constraints in Canola
Broad constraint resources are outlined in the Agronomists Toolkit. Specific constraint categories are listed below:
Poor seed quality
Constraint - Poor seed quality
Maximum seed weight and oil content has been reached when seed moisture has declined to 35-40 percent
Recommended guidelines to windrow canola are when 40 – 60 percent of seed has changed colour
While the seed is green, seed filling is continuing, accumulating seed weight, protein and oil
During the last few days leading up to the recommended windrowing time, canola can increase in yield by 100 kg/ha per day and oil content by between 0.3% and 0.6% per day
Timing of harvest is critical to avoid yield loss
Recieval standards may penalise seed lots with more than 30 mg/kg of chlorophyll, or reject them entirely
Close monitoring of canola and the ability to harvest within the optimum timeframe are crucial to ensuring the best possible yield result.
Links and Resources
AOF - Chlorophyll in Australian canola
4 page PDF. A paper on the occurrence of green seed in Australia, including prevalence and cause of green oil producing canola.
GRDC - Best Practice Management Guide. Green seed
Page 89. Discusses yield penalties for green seed. Published 2009.
GRDC - Retained seed Fact Sheet
4 page PDF. Key points, wet seed at harvest, harvest, storage, sowing, seed testing, and frequently asked questions. Published 2011.
|GRDC. Canola, timing of windrowing|