Evaluation of N nutrition and optimal fertilizer rate for ridge-furrow mulched maize based on critical N dilution curve under different water conditions

文献类型： 外文期刊

第一作者： Liu, Pengzhao

作者： Liu, Pengzhao;Fan, Zhen;Yan, Zinan;Ren, Xiaolong;Chen, Xiaoli;Liu, Pengzhao;Fan, Zhen;Ren, Xiaolong;Chen, Xiaoli;Zhao, Xining;Zhao, Xining;Zhang, Jianjun

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关键词： N accurate management; Critical nitrogen dilution curve; Ridge-furrow mulched maize; Rainfall types

期刊名称：AGRICULTURAL WATER MANAGEMENT （ 影响因子：6.7； 五年影响因子：6.6 ）

ISSN： 0378-3774

年卷期： 2024 年 296 卷

页码：

收录情况： SCI

摘要： Optimizing nitrogen (N) management based on the critical N dilution curve (N CDC ) has been proven a precision fertilization strategy to diagnose crop N nutrition status. However, few explorations have been done to establish a N CDC for dryland maize under double ridge-furrow mulching, a planting system that has been widely adopted in semi -arid areas. Moreover, the influences of various rainfall conditions on N CDC remain unclear. Therefore, a 9 -yr field nitrogen fertilization experiment from 2013 to 2021 (five nitrogen rates: 0, 75, 150, 225, and 300 kg N ha -1 , respectively, represented by N0, N0.25, N0.50, N0.75, and N1) was applied to established the N CDC under two planting systems (Flatting without mulching, CK; Double ridge-furrow with mulching, DRFM) and two rainfall types (rainfall season and drought season). Compared with CK, DRFM significantly increased plant dry matter (PDM, 5.5 - 12.8%) and N concentration (4.2 - 6.9%), ultimately improved grain yield (+16.9%), cumulative nitrogen recovery efficiency (C NRE , +9.8%) and crop water productivity (WPc, +26.3%). Rainfall from jointing to silking stage was an important contributor to grain yield. Compared with rainy season, drought season triggered a 51.7% yield loss and 17.1% reduction in NRE, respectively. The N CDC of the CK and DRFM were Nc=36.6xPDM -0.37 and Nc=38.4xPDM -0.36 in rainy season, respectively; the N CDC of the CK and DRFM were Nc =34.5xPDM -0.27 and Nc=37.3xPDM - 0.30 in drought season, respectively. The nitrogen nutrition index (NNI) and plant nitrogen requirement (PNR) based on the N CDC intuitively recorded the N nutritional status. The improved soil micro -environment, PDM and N uptake was recorded in N0.75 (225 kg N ha -1 yr -1 ) under wet season and in N0.50 (150 kg N ha -1 yr -1 ) under drought season, respectively, which brought an increase in crop productivity with a suitable N nutrition status. The findings highlight an accurate and effective method for assessing the N nutrition status of rainfed maize, and optimize fertilization strategy for sustainable production in semi -arid regions.

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