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Optimal K Management Improved Potato Yield and Soil Microbial Community Structure

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  • Huan Zhao

    (College of Resources and Environment, Southwest University, Chongqing 400716, China
    Guizhou Institute of Soil and Fertilizer, Guizhou Academy of Agricultural Sciences, Guizhou 550006, China)

  • Hai Liu

    (College of Business Administration, Guizhou University of Finance and Economics, Guizhou 550025, China)

  • Houjun Xiao

    (Guizhou Institute of Soil and Fertilizer, Guizhou Academy of Agricultural Sciences, Guizhou 550006, China)

  • Gang Hu

    (Guizhou Institute of Soil and Fertilizer, Guizhou Academy of Agricultural Sciences, Guizhou 550006, China)

  • Ming Gao

    (College of Resources and Environment, Southwest University, Chongqing 400716, China)

  • Zhengyin Wang

    (College of Resources and Environment, Southwest University, Chongqing 400716, China)

Abstract

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.

Suggested Citation

  • Huan Zhao & Hai Liu & Houjun Xiao & Gang Hu & Ming Gao & Zhengyin Wang, 2022. "Optimal K Management Improved Potato Yield and Soil Microbial Community Structure," Sustainability, MDPI, vol. 14(11), pages 1-14, May.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:11:p:6579-:d:825812
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    References listed on IDEAS

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    1. Pedro R. Soares & Rosinda L. Pato & Susana Dias & Daniela Santos, 2022. "Effects of Grazing Indigenous Laying Hens on Soil Properties: Benefits and Challenges to Achieving Soil Fertility," Sustainability, MDPI, vol. 14(6), pages 1-19, March.
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