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Trade-offs between residue incorporation and K fertilizer on seed cotton yield and yield-scaled nitrous oxide emissions

文献类型： 外文期刊

作者： Jiang, Nan 1 ; Zha, Li 1 ; Hu, Wei 1 ; Yang, Changqin 2 ; Meng, Yali 1 ; Chen, Binglin 1 ; Zhou, Zhiguo 1 ;

作者机构： 1.Nanjing Agr Univ, Key Lab Crop Physiol & Ecol, Minist Agr, Nanjing, Jiangsu, Peoples R China

2.Jiangsu Acad Agr Sci, Nanjing, Jiangsu, Peoples R China

关键词： Crop residue incorporation; Seed cotton yield; Nitrous oxide; Yield-Scaled nitrous oxide

期刊名称：FIELD CROPS RESEARCH （ 影响因子：5.224； 五年影响因子：6.19 ）

ISSN： 0378-4290

年卷期： 2019 年 244 卷

页码：

收录情况： SCI

摘要： Crop residues can effectively replace inorganic potassium (K) fertilizers to increase crop yield. However, the effect of incorporating consecutive crop residues instead of applying inorganic K fertilizers on seed cotton yield and yield-scaled N2O emissions (N2O emissions per unit yield of seed cotton) over a long period has rarely been reported. Therefore, a six-year (2011-2016) study incorporating crop residue instead of applying inorganic K fertilizer was conducted in a cotton-wheat system (transplanting cotton after wheat harvesting within the same crop season). Results showed that no statistical difference was observed between crop residue treatments and K fertilizers application on seed cotton yield during 2011-2014. However, in 2015, the yields of the inorganic K treatments were superior to the yields of the residue retained treatments. In 2016, the residue retained treatments and inorganic K treatments had similar seed cotton yields except that the K300 (300 kg N2O ha(-1)) treatment had a significantly higher yield than the 9000 kg ha(-1) wheat straw + 7500 kg ha(-1) cotton residue treatment (C7500 + W9000). The seasonal N2O emissions and yield-scaled N2O emissions increased by 1.01-1.65 times and 1.02-1.94 times in residue incorporation compared with inorganic K application treatments during 2015 and 2016 (the fifth and sixth year of residue incorporation), respectively. Furthermore, the soil N2O fluxes were significantly correlated with soil dissolved carbon and available mineral nitrogen contents. In conclusion, crop residue as a K source is a suitable alternate to enhance cotton yield and to replace inorganic K fertilizers but this could also boost the soil N2O fluxes, seasonal N2O emissions, and yield-scaled N2O emissions.

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