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Straw returning coupled with nitrogen fertilization increases canopy photosynthetic capacity, yield and nitrogen use efficiency in cotton
European Journal of Agronomy ( IF 4.5 ) Pub Date : 2021-03-12 , DOI: 10.1016/j.eja.2021.126267
Zhi Wang , Zhen Wang , Linjie Ma , Xiaobing Lv , Yali Meng , Zhiguo Zhou

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.



中文翻译:

秸秆还田与氮肥配施可提高棉花冠层光合能力,产量和氮素利用效率

氮(N)受精起着棉花群体光合能力和产量形成(关键作用陆地棉L.),但仍然知之甚少具有连续秸秆还田的相互作用的效果。进行了田间试验(2015–2018),以研究氮肥(0、75、150和300 kg N ha -1的影响)),再加上或不补充大麦和棉秸秆,对盐城地区土壤养分状况,棉花冠层光合能力,籽棉产量和氮利用效率(NUE)的影响。氮肥和秸秆还田可以提高棉花的大多数生长特性,其冠层表观光合作用速率,叶面积指数,叶氮含量,比叶面积和铃密度都较高,并且每年的籽棉产量逐渐增加。与相应的秸秆去除处理相比,2018年,秸秆添加在0、75、150和300 kg N ha -1下分别增加了籽棉产量7.5%,9.6%,12.1%和4.1%。在150 kg N ha -1以下,籽棉产量和NUE增幅最高加上秸秆还田是由于土壤肥力,冠层光合能力和棉花吸收氮的最大改善。另外,结果表明约。减少33-44%的化学氮肥用量不会影响添加秸秆的棉籽产量。我们的结果表明,秸秆还田与150 kg N ha -1的结合对改善土壤养分状况,冠层光合能力,籽棉产量和棉花的NUE都有好处。

更新日期:2021-03-15
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