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Straw returning coupled with nitrogen fertilization increases canopy photosynthetic capacity, yield and nitrogen use efficiency in cotton

文献类型： 外文期刊

作者： Wang, Zhi 1 ; Wang, Zhen 1 ; Ma, Linjie 1 ; Lv, Xiaobing 1 ; Meng, Yali 1 ; Zhou, Zhiguo 1 ;

作者机构： 1.Nanjing Agr Univ, Coll Agr, 1 Weigang, Nanjing 210095, Jiangsu, Peoples R China

2.Anhui Acad Agr Sci, Crop Res Inst, Hefei 230031, Anhui, Peoples R China

关键词： Consecutive straw addition; Nitrogen fertilizer rates; Canopy apparent photosynthesis rate; Seedcotton yield; Nitrogen use efficiency

期刊名称：EUROPEAN JOURNAL OF AGRONOMY （ 影响因子：3.726； 五年影响因子：4.373 ）

ISSN： 1161-0301

年卷期： 2021 年 126 卷

页码：

收录情况： SCI

摘要： Nitrogen (N) fertilization plays a pivotal role in canopy photosynthetic capacity and yield formation of cotton (Gossypium hirsutum L.), but the interaction effects with consecutive straw returning remain poorly understood. A field experiment was conducted (2015?2018) to examine the effects of N fertilization (0, 75, 150, and 300 kg N ha-1) coupled with or without barley and cotton straw supplementation on soil nutrient status, cotton canopy photosynthetic capacity, seedcotton yield, and nitrogen use efficiency (NUE) in Yancheng, China. N fertilization coupled with straw addition enhanced most cotton growth traits, showing higher canopy apparent photosynthesis rate, leaf area index, leaf N content, specific leaf area, and boll density, and progressively increased seedcotton yield annually. In 2018, straw addition increased seedcotton yield by 7.5 %, 9.6 %, 12.1 %, and 4.1 % under 0, 75, 150, and 300 kg N ha-1, respectively, compared to corresponding treatments of straw removal. The highest increase in seedcotton yield and NUE under 150 kg N ha-1 combined with straw addition was due to the greatest improvements in soil fertility, canopy photosynthetic capacity, and N uptake by cotton. In addition, the results suggested that approx. 33?44 % of chemical N fertilizer reduction would not affect seedcotton yield with straw addition. Our results demonstrated that straw returning combined with 150 kg N ha-1 had benefits on improving soil nutrient status, canopy photosynthetic capacity, seedcotton yield, and NUE of cotton.

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