Effect of site-specific nutrient management on productivity and economics of rice (Oryza sativa)–wheat (Tritucum aestivum) system

A field study was conducted during two consecutive years 2006–08, to evaluate the response of site-specific nutrient management (SSNM) on productivity and economics of rice (Oryza sativa L.)–wheat {Triticum aestivum (L.) emend Fiori and Paol} cropping system. The total productivity of the cropping system in terms of rice yield equivalent (14.8 t/ha/annum) was the highest with the application of SSNM treatment i.e. N₁₅₀P₆₀K₁₂₀S₄₀B₅Mn₂₀Zn₂₅ in rice and N₁₅₀P₆₀K₁₂₀ in wheat, which was 66.4% higher over farmer's practice and 28.2% over state recom mended practice. All the yield attributing characters as well as yield of both rice and wheat showed beneficial effects of site-specific nutrient management. Highest net returns of 67,033/ha/annum obtained with SSNM treatment, which was 31,681 and 16,905/ha/annum higher over that of farmer's practice and state recommended doses, respectively. Thus, nutrients in rice–wheat cropping system may be applied on site-specific soil test basis including micronutrients along with major nutrients for higher productivity and profitability.