Split-nitrogen application increases nitrogen-use efficiency and yield of cotton

文献类型： 外文期刊

第一作者： Feng, Weina

作者： Feng, Weina;Li, Pengcheng;Zheng, Cangsong;Sun, Miao;Shao, Jingjing;Li, Xiaofei;Dong, Helin

作者机构：

关键词： Cotton yield; N use efficiency; Soil mineral N content; Split N fertilization

期刊名称：NUTRIENT CYCLING IN AGROECOSYSTEMS （ 影响因子：3.1； 五年影响因子：3.7 ）

ISSN： 1385-1314

年卷期： 2023 年 125 卷 3 期

页码：

收录情况： SCI

摘要： Efficient nitrogen (N) fertilizer management is critical for crop production and environmental sustainability. In cotton, however, a joint assessment of location-specific N management effects on agronomic performance and environmental impacts is still required to design a sustainable production system. Therefore, a 2-yr field study was conducted to investigate the response of cotton growth, yield, N use efficiency, changes in soil mineral N content (N-min) and apparent N loss to different N management strategies in the Yellow River Valley of China. Fertilizer N treatments included split applications at sowing, the early flowering stage and the peak flowering stage respectively of 180-0-0, 108-72-0, 72-108-0, 72-72-36 and 72-36-72 kg N ha(-1). The results showed that, on average, split-N increased shoot biomass by 15.5%, seed cotton yield by 5.8%, lint yield by 4.9%, and N uptake by 23.7%. The highest cotton yield, maximum growth rate, N uptake, and N use efficiencies were obtained with the application of 72 kg N ha(-1) at sowing. Treatment of 72-36-72 resulted in a greater residual soil N-min. In addition, apparent N loss was negatively correlated to the growth rate and N use efficiencies. Apparent N loss in single application was 48.3% of the total N, but split-N applications lowered it to 38.5%. Overall, we concluded that twice-split application with allocating more of N fertilizer to the early flowering stage contributes to a more sustainable cotton production for enhancing yield and N use efficiency while minimizing N loss.

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