Trent Potter, Yeruga Crop Research
Uploaded October 2013

Testing retained sowing seed of hybrid canola over a range of rainfall zones

Background.
Canola hybrids are now available in Australia covering conventional, Clearfield, triazine tolerant and Roundup Ready herbicide systems. As farmers are used to sowing retained seed from open pollinated crops they may wish to retain sowing seed harvested from the previous hybrid crop to reduce the up-front cost of sowing a canola crop. Little independent research has evaluated the effect on plant growth, blackleg resistance and grain yield. It is important that farmers have credible information as to the effect of retaining hybrid seed in all rainfall zones.

Recent on-farm research.
On-farm research has previously been conducted as part of the “Better Oilseeds” project but only based on one hybrid variety. This research showed reduction in blackleg resistance in the retained hybrid seed but variable grain yield responses. Additional research has been conducted by Pacific Seeds that showed significant yield reductions by retaining hybrid seed. This research, however, only tested Pacific Seeds hybrids and used seed harvested from yield plots and so would be expected to have some contamination from previously harvested plots.

This preliminary work highlights a need for further on-farm research to determine the effect of retaining hybrid sowing seed on plant growth, blackleg resistance and grain yield for the range of herbicide tolerance options over a range of rainfall zones in southern Australia.

Research objective.
This research program aimed to conduct a series of trials in 2012 to measure the effect of retaining hybrid sowing seed on plant growth, blackleg resistance and grain yield compared to the original hybrid (ie. as purchased from seed supplier; referred to as ‘commercial’ here after) for a range of herbicide tolerance options in a range of rainfall zones in southern Australia.

For more information and the complete document – click here

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