The Effect of Simulated Distribution of Soil Mineral Nitrogen and Root Traits on Wheat Yield and Grain Nitrogen Concentration

J. Haberle
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引用次数: 1

Abstract

The effect of different distribution of available mineral N (Nmin) in a soil profile, in combination with increasing N fertilization rates, on grain N concentration and yield of winter wheat was studied with the model CERES-wheat. A great proportion of Nmin in a deep subsoil under 90 cm resulted in enhancement of grain N concentration but at the expense of grain yield. Under a high total Nmin supply in rooted soil volume the effect was less. High N fertilization rates almost eliminated the effect of different Nmin distributions. The enhancement of root growth rate and maximum depth by 30% decreased significantly residual Nmin in deep subsoil when total Nmin was high. The modification had no impact on simulated grain N concentration but it increased yields, most remarkably when a great proportion of total Nmin could be found under 90 cm.
土壤矿质氮模拟分布及根系性状对小麦产量和籽粒氮浓度的影响
采用ceres -小麦模型,研究了不同土壤剖面有效矿质氮(Nmin)分布与施氮量增加对冬小麦籽粒氮浓度和产量的影响。在90 cm以下的深层土壤中大量施用氮肥可以提高籽粒氮含量,但以牺牲籽粒产量为代价。根土体积中Nmin总供给量较大时,影响较小。高施氮量几乎消除了不同Nmin分布的影响。当总Nmin较高时,根系生长率和最大深度提高30%,深层土壤残余Nmin显著降低。改良对模拟籽粒氮素浓度没有影响,但提高了产量,其中以90cm以下占总氮素的很大比例最为显著。
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