Effects of N fertilization on winter wheat grain yield and its crude protein content and apparent N losses

Abstract

Abstract: Field experiments were conducted at four sites in 2002 to study the effects of N fertilization on winter wheat yield and its crude protein content and apparent N losses.The results showed that at these sites,the N application rate for maximum grain yield was 0,0,79 and 118 kg·hm^-2,and that for maximum grain crude protein content was 122,100,127 and 174 kg·hm^-2,respectively.The residual nitrate-N content in 0～90 cm soil layer after harvest was linearly increased,while the apparent N losses during wheat growth season was exponentially increased with increasing N application rate.Under the N application rate for maximum yield,soil residual nitrate-N content ranged from 86 to 115 kg·hm^-2 and apparent N losses ranged from² to 32 kg·hm^-2,which were much lower than the residual nitrate-N content(106～168 kg·hm^-2)and apparent N losses(14～56 kg·hm^-2)when the maximum grain crude protein content was achieved.The results showed that the maximum wheat grain yield and the environment effects of N fertilization could be harmonized by an optimized N application rate,but,if considering the importance of wheat grain protein,more research in the future should be needed.

Key words: Optimized N management, Soil nitrate-N content, Apparent N losses, Crude protein content

CLC Number:

S143.1

CUI Zhenling, SHI Liwei, XU Jiufei, LI Junliang, ZHANG Fusuo, CHEN Xinping . Effects of N fertilization on winter wheat grain yield and its crude protein content and apparent N losses[J]. Chinese Journal of Applied Ecology, 2005, 16(11): 2071-2075.

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