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-...