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significant yield penalty

Catalogue: GRDC Updates
Early lock-up enables a crop sufficient time to achieve biomass levels at flowering to fully recover grain yield but lower residual biomass at lock-up can reduce crop recovery during a sensitive window around or shortly after GS30 in cereals and bud visible in canola... We believe there is a 'sensitive' window when the crop may still be grazed but sufficient residual biomass is required to allow the crop to reach its critical biomass or leaf area to achieve potential grain yields... We firstly present some results form an experiment conducted at Greenethorpe, NSW in 2013 where a range of mechanical defoliation intensities (hard cut - 5 cm, moderate cut - 8 cm and 'clip' cutting - removing leaves) and lock-up timings were imposed to explore their impact on yield recovery in a winter and spring wheat and canola...
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Catalogue: GRDC Final Reports
The project has underpinned a significant shift in the approach to cereal, pulse and canola production across the cropping areas of South Australia... Growers have changed their approach from a "recipe - high input" farming practice to a more tactile risk management approach with the skills gained from principles demonstrated throughout the project... The project has enabled growers to confidently apply later nitrogen to manage seasonal risk and crop canopies with little or no risk of decreased yields in drier than average seasons...
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