Long-term effects of potassium fertilization on yield, efficiency, and soil fertility status in a rain-fed maize system in northeast China

文献类型： 外文期刊

第一作者： Qiu, Shaojun

作者： Qiu, Shaojun;Zhao, Shicheng;Xu, Xinpeng;Zhou, Wei;He, Ping;Jin, Jiyun;Xie, Jiagui;Hou, Yunpeng;Wang, Xiufang;He, Ping;Jin, Jiyun;He, Ping;Jin, Jiyun;Johnston, Adrian M.;Christie, Peter

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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： The effects of 20 years of potassium (K) fertilization (in two treatments: 113 and 225 kg K2O ha(-1)) on grain and stover yields, plant K concentrations, aboveground K uptake, K use efficiencies, soil K pools, and the K balance were examined in a Haplic Phaeozem soil under a rain-fed mono-cropped spring maize (Zea mays L.) system in the province of Jilin, northeast China. The indigenous K supply (zero K application) maintained an average grain yield of 7.0 t ha(-1) per year, but the year-to-year variation was large. Application of K significantly (P < 0.05) increased the average grain yields by 15.1 and 13.8% in the 113 and 225 kg K2O ha(-1) treatments, respectively, over the experimental period. The mean K recovery efficiency, K agronomic efficiency, and K partial factor productivity decreased from 37.3 to 28.5%, 10.8 to 4.9 kg kg(-1), and 86.8 to 43.1 kg kg(-1) when the K application rate increased from 113 to 225 kg 1(20 ha(-1). The effect of K application was larger on stover K concentrations than grain K concentrations. In the top 100 cm of the soil profile, excessive or non-synchronized K application significantly (P < 0.05) increased the leaching of exchangeable K in comparison with the control, but K application had little effect on soil non-exchangeable K and total K. K fertilizer, therefore, plays an important role in increasing grain yields in China, but the K application rate can be reduced if farmers return stover to the soil and make full use of K below the soil surface

分类号： S

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