Effectiveness of fall- versus spring-applied urea on barley |
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Authors: | M Nyborg S S Malhi |
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Affiliation: | (1) Department of Soil Science, University of Alberta, T6G 2E3 Edmonton, Alberta, Canada;(2) Agriculture Canada, Research Station, T0C 1S0 Lacombe, Alberta, Canada |
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Abstract: | Field experiments were conducted in north-central and central Alberta to determine the effect of pellet size and depth of placement on yield and N uptake of barley from fall- and spring-applied urea. The application rate was 56 kg N ha–1. Fall incorporated commercial urea (0.01 g) gave 792 kg ha–1 lower yield and 15 kg ha–1 less N uptake than similarly applied commercial urea in spring on the average for the five experiments. The effectiveness of fall-applied N tended to be greater with large urea pellets (2.5 g), especially when they were placed 15 cm deep. Specifically, the relative yield efficiency of fallversus spring-applied N was 77% when the larger pellets were placed 4 cm deep and 95% when placed 15 cm deep. However, large pellets were less effective than commercial urea when both were applied in spring at sowing or two weeks before. |
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Keywords: | Band placement fall application large pellets spring application super granules urea |
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