Optimal K Management Improved Potato Yield and Soil Microbial Community Structure

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