Critical Nitrogen Dilution Curve for Optimizing Nitrogen Management of Winter Wheat Production in the North China Plain

• DOI: 10.2134/agronj2011.0258
• Publication Date: 2012-03-05T11:53:45Z
• Authors: Shanchao Yue; Qingfeng Meng; Rongfang Zhao; Fei Li; Xinping Chen; Fusuo Zhang; Zhenling Cui
• Keywords: Dilution; Winter wheat

Investigating critical N concentration, that is, the minimum concentration necessary to achieve maximum growth, provides insights into nutrition and can serve as a guide improving agricultural practices regulations. Our objectives were evaluate dilution curves for deficient, optimal, excess added determine curve winter wheat ( Triticum aestivum L.) in North China Plain (NCP) based on 15 fertilization experiments with three six rates. The supplements significantly affected curve, increased supply generally resulted greater concentration. was described by equation nitrogen (N c ) = 4.15 W –0.38 when aboveground biomass between 1 10 Mg dry matter (DM) ha −1 . When <1 DM , constant value 4.15% DM, which independent of biomass. This lower than France. validated through index (NNI) defined ratio measured holds promise an efficient tool guiding N‐fertilization regulations production NCP.