Differents water depth and nitrogen fertilization effect on wheat crop yield

Abstract

This work reports an experiment conducted under field condictions, with the objective of studing the effect of applied water depth, nitrogen fertilization and interactions between such factors on the wheat yield. The experiment was carried out in a randomized blocks design, with split-plots and four replications. Six water depths (W₁ = 274, W₂ = 240, W₃ = 157, W₄ = 78, W₅ = 10.5 mm e W₆ = 0), and five levels of nitrogen (N₀ = 0, N₁ = 40, N₂ = 80, N₃ = 160 e N₄ = 320 kg.ha^-1) were combined and applied to the plots. Maximum grain yield (5.466.5 kg.ha^-1) was observed for 274 mm irrigation depth and 80 kg N.ha^-1. The number of grains per spike increased with the water depth and nitrogen level, achived the maximum (40.7) for 157 mm of water and 160 kg N.ha^-1.The weight of 1000 grains decreased and the fertile tillers ratio increased up to 240 mm of water and 160 kg N.ha^-1