A reappraisal of the critical nitrogen concentration of wheat and its implications on crop modeling

文献类型： 外文期刊

第一作者： Zhao, Zhigan

作者： Zhao, Zhigan;Wang, Zhimin;Zang, Hecang;Liu, Yunpeng;Zhao, Zhigan;Wang, Enli;Zhao, Zhigan;Wang, Enli;Zang, Hecang;Angus, John F.;Angus, John F.

作者机构：

关键词： Maximum N concentration;Shoot biomass;Developmental stage;N dilution curve;APSIM

期刊名称：FIELD CROPS RESEARCH （ 影响因子：5.224； 五年影响因子：6.19 ）

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收录情况： SCI

摘要： The concept of critical nitrogen (N) concentration (Ncc) has been used for both diagnostic purposes and modelling of wheat-N relations. Ncc has been derived with two contrasting approaches: one against above ground biomass (Ncc-biomass), and one against developmental stages (Ncc-stage). While the former has been claimed in diagnostic use, both approaches are adopted in wheat simulation models. This paper provides data from North China Plain (NCP) to re-exam the Ncc-stage relationships used in two widely used wheat models (APSIM and CERES) and to compare the Ncc-biomass vs. Ncc-stage relationships. The results revealed significant higher maximum and critical N concentrations in leaves of wheat in NCP than the values used in the APSIM-wheat model. Recalibration of the APSIM model with the new N concentrations led to improved simulations for wheat biomass and N uptake, particularly under low N input. Our results also show that the Ncc-stage relationship appeared to be more robust than the Ncc-biomass relationship, and it helped explain the variations in wheat Ncc-biomass curves from different regions. This likely reflects the fact that Ncc-stage curve captures the stage-driven formation of structural biomass and carbohydrate reserves of wheat, which is the main cause for N dilution. The implications of the findings on modelling of wheat-nitrogen relationships and on nitrogen management practices are also discussed. (C) 2014 Elsevier B.V. All rights reserved.

分类号： S

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