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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Nyborg, M., Malhi, S.S. Effectiveness of fall- versus spring-applied urea on barley. Fertilizer Research 31, 235–239 (1992). https://doi.org/10.1007/BF01063297
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DOI: https://doi.org/10.1007/BF01063297