Development of a critical nitrogen dilution curve based on leaf dry matter for summer maize

文献类型： 外文期刊

第一作者： Zhao, Ben

作者： Zhao, Ben;Liu, Zhandong;Ning, Dongfeng;Xiao, Junfu;Liu, Zugui;Qin, Anzhen;Nan, Jiqin;Duan, Aiwang;Ata-Ul-Karim, Syed Tahir

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关键词： Summer maize;Critical nitrogen concentration;Leaf dry matter;Nitrogen management;Nitrogen diagnosis

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： Accurate diagnosis of nitrogen (N) fertilizer required for crop growth can serve as a guide for N management by improving N use efficiency and grain yields. The critical N concentration (N-c) the minimum N required for maximal crop growth has been widely used to determine crop N status. N-c dilution curves have been determined in several crops including summer maize on plant dry matter (DM) basis, yet no attempt has been made to determine the N-c dilution curve on the basis of leaf dry matter (LDM) in summer maize. The present study aimed to determine a N-c dilution curve based on LDM for in-season assessment of crop N status in summer maize. Six field experiments were performed with four summer maize cultivars using varied N fertilizer rates ranging from 0 to 320 kg N ha(-1). The leaf N-c curve was described by the equation: N-c = 3.45LDM(-0.22), when LDM ranged from 1.18 to 3.45 t ha(-1). For LDM < 1.18 t ha(-1), the constant N-c = 3.33% was used. The newly developed curve effectively distinguishes N-limiting from non-N-limiting treatments under different environmental conditions. In the present study, the N nutrition index (NNI) ranged from 0.49 to 1.16 under different N rate treatments. The correlation between NNI and relative yield (RY) was a significantly positive, while the correlation between NNI and the agronomic N use efficiency (AE) was significantly negative. The newly developed leaf N-c dilution curve not only determines the crop N status, but also elucidates the yield and AE changes in response to different N rate treatments in summer maize. The projected results of the study will provide accurate N status diagnosis at critical growth stages and guidance for precision N management in summer maize, thus contributes towards the sustainability of intensive maize cropping systems in China.

分类号： S

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