TIn response to the "low nitrogen and low carbon" characteristics of the soil in the dry farming area of the Longzhong Loess Plateau and the problem of excessive application of chemical fertilizers, this study explored the optimal proportion of organic fertilizer substitution for chemical fertilizers to achieve green increase in potato yield and efficient synergy of resources. The experiment set up 6 treatments to measure yield, quality and fertilizer utilization rate, and combined with ¹⁵N tracing to quantify the nitrogen utilization mechanism. The conclusion showed that 20% organic substitution by matching slow-release nutrients with the peak nutrient demand, activating soil phosphorus and potassium, and enhancing carbon metabolism was a preliminary optimized technical paradigm for achieving "equivalent nutrient substitution of 20% chemical fertilizers-5.4% increase in yield-improvement in quality and efficiency" in arid areas.

arid farming area  /  potato  /  phosphorus, potassium, nitrogen  /  organic fertilizer