Effects of wheat straw incorporation in cotton-wheat double cropping system on nutrient status and growth in cotton

文献类型： 外文期刊

第一作者： Yu, Chaoran

作者： Yu, Chaoran;Wang, Xiaojun;Hu, Bo;Meng, Yali;Zhou, Zhiguo;Yang, Changqin;Liu, Ruixian;Sui, Ning

作者机构：

关键词： Cotton (Gossypium hirsutum L.);Wheat straw incorporation;Potassium application;Nutrient concentration;Biomass accumulation

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

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收录情况： SCI

摘要： Soil potassium deficiency causes cotton (Gossypium hirsutum L) yield decline, which China addresses through the importation of costly inorganic potassium. While applying inorganic potassium fertilizer in long-term would cause environmental issues. The feasibility of wheat straw incorporation replacing inorganic potassium for soil available potassium concentration in cotton-wheat double cropping system has been confirmed in the previous study. However, little is known about the dynamics of the nutrient concentrations and growth in cotton grown under wheat straw incorporation and inorganic potassium application. Based on the production reality in cotton-wheat double cropping system, total and half wheat straw incorporation (9000 and 4500 kgha(-1)), high-and super-high-yielding management requiring inorganic potassium application (150 and 300 kgk(2)Oha(-1)), and control (without wheat straw or inorganic potassium) conditions were set. The 3-year in-situ field experiments were conducted in Nanjing and Dafeng, China, on clay-and sandy-loam soil with initial (2011) available potassium of 155 and 316 mgkg(-1), respectively. The results indicated that nitrogen and phosphorus concentrations in cotton were little affected. Potassium concentrations in cotton under wheat straw incorporation of 9000 kg ha(-1) in Nanjing and 4500 and 9000 kg ha(-1) in Dafeng were consistent with those under inorganic potassium applications. Cotton biomass increments under inorganic potassium applications were greater than wheat straw incorporations at the late growth period. In Nanjing in 2013, seedcotton yield under wheat straw incorporation of 9000 kg ha(-1) was similar to that of 150 kgK(2)Oha(-1), but was markedly lower than that of 300 kgk(2)Oha(-1). Wheat straw incorporation enhanced green leaf area duration (LAD) at the late period of cotton growth, while LAD remained longer under inorganic potassium. Relative growth rate (RGR) and net assimilation rate (NAR) of cotton under wheat straw incorporation were lower than those under inorganic potassium application. Greater cotton biomass increment at the late growth period under inorganic potassium applications were probably more because LAD remained longer, rather than RGR and NAR greater. These results showed that the short-term (3 years) strategy of incorporating 9000 kgha-1 wheat straw to replace inorganic potassium (150 kg K(2)Oha(-1)) was effective for high-yielding cotton production. (C) 2016 Elsevier B.V. All rights reserved.

分类号： S

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