Single And Split Nitrogen Dose In Wheat Yield Indicators
REVISTA BRASILEIRA DE ENGENHARIA AGRICOLA E AMBIENTAL(2018)
Abstract
Single or split nitrogen (N) supply can maximize the expression of wheat yield indicators. The objective of the study was to evaluate the greater N use efficiency on wheat yield indicators by the single and split N supply under favorable and unfavorable year conditions to the crop in succession system of high and reduced residual N release. The study was conducted in 2014 and 2015, in a randomized complete block design with four replicates in a 4 x 3 factorial, for N-fertilizer doses (0, 30, 60, 120 kg ha(-1)) and supply forms [full dose (100%) in the phenological stage V-3 (third expanded leaf); split dose (70 and 30%) in the phenological stages V-3/V-6 (third and sixth expanded leaves, respectively) and; split dose (70 and 30%) in the phenological stages V-3/R-1 (third expanded leaf and early grain filling)], respectively, in soybean/wheat and maize/wheat cultivation systems. The highest N use efficiency for wheat yield was obtained with the single dose supply in favorable year of temperature and rainfall and with the split dose in the V-3/V-6 stages in unfavorable year, regardless of the succession system of high and reduced residual N release.
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Key words
Triticum aestivum,urea,residual N,temperature,rainfall
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