Seed size matters

The Weekly Advertiser Horsham - - Ag Life -

Na­tional her­bi­cide-sus­tain­abil­ity or­gan­i­sa­tion Weeds­mart has alerted grow­ers that the size of sown seed can be im­por­tant in man­ag­ing her­bi­cide re­sis­tance.

It has listed crop com­pe­ti­tion as an im­por­tant strat­egy in its 10-point plan, ad­ding it was not all about row width and seed­ing rate.

Wagga Wagga-based NSW DPI re­search and devel­op­ment agron­o­mist Rohan Brill, along with col­leagues at Trangie and Tam­worth, has been teas­ing apart whether the im­proved early per­for­mance of canola hy­brids over open-pol­li­nated cul­ti­vars came from the gen­er­ally-larger seed size of hy­brids or from hy­brid vigour.

“It seems that most of the im­proved early growth in hy­brids lies in the larger seed size, with het­ero­sis pro­vid­ing an ad­di­tional ben­e­fit,” he said.

“Our study showed that sow­ing large canola seed, re­gard­less of the cul­ti­var, was key to strong early crop growth and the crop’s abil­ity to com­pete with weeds.

“A 10 per­cent dif­fer­ence in seed di­am­e­ter pro­duces a 33 per­cent dif­fer­ence in seed vol­ume.”

For more in­for­ma­tion about man­ag­ing her­bi­cide re­sis­tance visit the Weeds­mart web­site, www. weeds­

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