Abstract:Different farmlands including only cropping quinoa(CK), 4 years continuous cropping potato, 1 year oil- sunflower rotation after 4 years continuous cropping potato, 6 years continuous cropping potato, 1 year oil-sunflower rotation after 6 years continuous cropping potato were selected, and which soil properties, soil enzyme activities, soil microorganism quantities and the growth and development indicators of potatoes were measured and compared to explore the effects of oil-sunflower rotation on the growth and resistance physiology of potato under different continuous cropping potato. The results showed that with the increase of continuous cropping year, soil pH of potato rhizosphere increased and tended to alkalinity in general, the contents of organic matter and available phosphorus decreased, alkali-hydrolyzable nitrogen content increased. Soil enzyme activities were negatively correlated with continuous cropping year and were lowest in the 6 years continuous cropping. With the increase of continuous cropping year, the quantities of soil bacteria and actinomycetes and the ratio of bacteria and fungi (B/F) decreased, but fungi quantity increased. The deterioration of potato rhizosphere soil environment resulted in the reduction in potato growth, chlorophyll content, leaf photosynthesis, SOD activity and the increase in production rate of O2–. and MDA content. In general, compared with non-rotation, oil-sunflower rotation significantly reduced soil pH, increased contents of organic matter, available phosphorus and alkali-hydrolyzable, improved soil enzyme activities, the quantity of bacteria and B/F, reduced the quantity of fungi, improved soil microenvironment, promoted potato growth, increased relative chlorophyll content, photosynthesis and SOD activity, decreased production rate of O2–. and MDA content, reduced membrane lipid peroxidation and free radical damage, enhanced antioxidant capacity. Generally, oil-sunflower rotation in 4 years continuous cropping was better, which well alleviated potato continuous cropping obstacles.