Vol. 9, Issue 3, Part B (2025)

A field experiment focused on fertility management was conducted in Persiya village, Chandauli district, on Inceptisol soil, to analyze the correlation between soil test values, fertilizer application rates of nitrogen, phosphorus, and potassium, and the crop response of rice. The fertilizer adjustment equations were formulated by the All India Coordinated Research Project at the Institute of Agricultural Sciences, Banaras Hindu University, Varanasi. Findings demonstrated that the targeted rice yields of 38 q ha^-1 and 43 q ha^-1 were achieved by applying plant nutrients based on the soil test crop response (STCR) technology. Yield improvements ranged from 16.60% to 32.20% and 14.73% to 30.77% compared to traditional farmer practices. The highest net returns, ranging from ₹ 36,515.20 to ₹ 45,480.20 for one target and ₹ 35,035.18 to ₹ 44,300.18 for the other, were observed in treatments where fertilizers were applied as per soil test recommendations (STCR treatments). This method also preserved soil nutrient availability. Consequently, applying nutrients according to soil test values is essential for maximizing returns and maintaining soil fertility. The fertilizer doses were validated for achieving yield targets of 38 and 43 q ha^-1 in farmers' fields, with rice yields deviating by less than 10%. This outcome confirms the effectiveness of soil test-based fertilizer application. The approach can be adapted to other regions with similar soils and climatic conditions to enhance rice production.