Diagnosis and comprehensive evaluation of nitrogen nutrition in non-mulched drip irrigation cotton in southern Xinjiang based on critical nitrogen concentration

文献类型： 外文期刊

第一作者： Li, Guohui

作者： Li, Guohui;Wang, Hongbo;Tang, Maosong;Wang, Xingpeng;Wang, Hongbo;Wang, Xingpeng;Wang, Hongbo;Wang, Xingpeng;Gao, Yang;Fu, Yuanyuan;Huang, Weixiong;Wang, Xingpeng

作者机构：

关键词： Cotton; Water and N transport; Yield; Critical dilution curve; TOPSIS

期刊名称：AGRICULTURAL WATER MANAGEMENT （ 影响因子：6.5； 五年影响因子：6.9 ）

ISSN： 0378-3774

年卷期： 2025 年 316 卷

页码：

收录情况： SCI

摘要： The critical nitrogen (N) dilution curve (CNDC) describes the process of achieving the highest yield with the lowest nutrient concentration. It is influenced by species and environment, providing a new strategy for diagnosing cotton nitrogen status and its impact on cotton growth and yield. This study investigated the effects of two irrigation amounts (45 and 54 mm) and three N application rates (150, 225, and 300 kg ha(-1)). Results indicated that compared with low water treatment (W1), increasing irrigation water led to a 21.3-24.7% increase in dry matter, a 22.2-29.6 % increase in N accumulation, a 1.4-26.1 % decrease in soil N content, and a 3.9-9.0 % reduction in N percentage of reproductive organs. The nutrient network index (NNI) decreased by 2.2-6.4 %, while irrigation water productivity (WPI) decreased by 5.4-22.1 %. Compared with low nitrogen (F1), increasing N fertilization application enhanced dry matter by 7.1-20.8 % and N accumulation by 2.7-24.8 %, while also increasing the nitrogen percentage in reproductive organs by 4.0 -9.9 %. Experimental results demonstrated that moderate increases in irrigation and nitrogen application improved seed cotton yield and the partial factor productivity of N (PFPN). Under the W1 treatment, higher nitrogen application brought cotton plant N closer to a optimal condition. However, excessive water and N exacerbate N loss and result in a nutrient network index (NNI) value below 1, indicating prolonged nutrient deficiency. The TOPSIS comprehensive evaluation indicates that an irrigation water amount of 45 mm and a nitrogen application rate of 300 kg ha(-1) represent optimal water and nitrogen application strategies under water resource constraints. Conversely, an irrigation water amount of 54 mm and a nitrogen application rate of 225 kg ha(-1) are identified as the optimal strategies for achieving high cotton yields.

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