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Fluid Journal : Fluid Journal 1999-2001
Spring 2000 not influence biomass yield, but biomass yield was reduced by herbicide application. A distinct delay in flowering was also noted with herbicide application. Seed yield Seed yield on both soils increased with increasing N rates, with the relationship on the clay loam soil being linear and on the fine sandy loam soil cubic. Yield potential was higher on the clay loam soil. There was a greater degree of N deficiency, so the yield response persisted to a higher N level. It appeared that decreasing stand density actually benefited seed yield at the clay loam site. This may have been due to: 1) late seeding, 2) wet, cold growing conditions, or 3) the presence of early-season S deficiencies, which were corrected at bolting by application of CaSO4 fertilizer. On the fine sandy loam soil, application of Roundup decreased canola seed yield. This appeared to be related to damage from the herbicide, since the herbicide also led to a reduction in biomass yield and delayed flowering at this location. Therefore, the cultivar was not completely resistant to the herbicide but did show some damage. Procedure Replicates: 4 Treatments: 21 x 2 (high and low competition) Seeding rate: 9.0 lbs/A Seeding depth: 1.0 inch or less Total plots: 336 Seeding equipment: SeedHawk (8-inch spacing) Locations: 2 Plot size: 2 yds. x 5 yds. Measurements: Soil nutrient status Spring moisture Stand emergence Biomass yield at flowering Weed populations Seed yield Seed quality _________________________________ Drs. Grant, Derksen, and McLaren are research scientists at Agriculture and Agri-Food Canada at Brandon, Manitoba. ! 200 180 160 140 120 100 80 60 40 Figure 3. Effect of N rate and NBPT on stand density at two weeks in a fine sandy loam soil, Grant, et al., Manitoba, 1999. Stand Density (plants/yd2) 0 50 100 150 200 250 UAN UAN+UI 200 180 160 140 120 100 80 60 40 Figure 4. Effect of N rate and NBPT on stand density at four weeks in a fine sandy loam soil, Grant, et al., Manitoba, 1999. Stand Density (plants/yd2) UAN UAN+UI Nitrogen Rate (lbs/A) 0 50 100 150 200 250 Nitrogen Rate (lbs/A)
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