Optimal K Management Improved Potato Yield and Soil Microbial Community Structure

文献类型： 外文期刊

第一作者： Zhao, Huan

作者： Zhao, Huan;Gao, Ming;Wang, Zhengyin;Zhao, Huan;Xiao, Houjun;Hu, Gang;Liu, Hai

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关键词： K application rates; potato yield; sustainable yield index; microbial community

期刊名称：SUSTAINABILITY （ 影响因子：3.889； 五年影响因子：4.089 ）

ISSN：

年卷期： 2022 年 14 卷 11 期

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收录情况： SCI

摘要： Optimal potassium (K) fertilizer application in potato cropping systems can effectively increase food production and mitigate soil microbial ecosystem stress. The dynamics and sustainability of potato yield, the dynamics of potato commodity rates (CRs), and microbial community structure were explored under four different K application rates (kg K ha(-1) year(-1)): 0 (control), 75 (low K), 150 (medium K), and 225 (high K). Compared with the low-K application, the medium-K and high-K applications increased potato yields by 8.08% and 11.66%, respectively. The mean CR of potato tubers during 4 years was significantly greater under the medium-K treatment than under the low-K and high-K treatments. Both medium-K and high-K applications significantly enhanced the sustainable yield index (SYI) relative to the Low-K application by 7.93% and 9.34%, respectively. Compared with the zero-K, low-K, and high-K treatments, the medium-K treatment improved the total phospholipid fatty acid (PLFA) contents by 11.91%, 16.84%, and 11.66%, respectively. Moreover, the medium-K application increased the bacterial PFLA, actinomycete PFLA, gram-positive (G(+)) bacterial PFLA, and gram-negative (G(-)) bacterial PFLA contents in the soil. Overall, application of 150 kg ha(-1) year(-1) K fertilizer represents a promising fertilization strategy in potato cropping systems in Southwest China.

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