Weed management systems in spring wheat
Date
1990-02-22
Authors
Guitard, R.E.
Holm, F.A.
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Trials were conducted at two locations near Saskatoon during 1989 to compare the effectiveness of three weed management systems in spring wheat. A conventional weed management system (pre- and post-emergent herbicides plus tillage) was compared to a conservation weed management system (herbicides and no tillage) and a cultural system (tillage and no herbicide). Each system was used in Katepwa spring wheat seeded at early (May 11) and late (May 29) seeding dates. Herbicides applied prior to crop emergence were pre-selected. Post-emergent herbicides were selected on the basis of the weed populations at each site. The Kernen site was a heavy clay soil which had been summerfallowed the previous year. The Sutherland site was a clay loam soil which was seeded to wheat during 1988. A heavy
population of green foxtail (Setaria viridis) dominated the Sutherland site. The Kernen site had a light population of annual broad-leaved weeds. Average grain yields at both sites were in the range of 2000 kg/ha. However, none of the three management systems resulted in increased grain yield. Early seeding resulted in significantly higher weed populations and grain yields at both sites. The average cost of seedbed preparation and weed control operations showed that the conventional, conservation and cultural systems ranked from highest to lowest, respectively. In the absence of a yield response to any system during 1989, the check plots produced the highest net return.
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Soils and Crops Workshop