A field experiment entitled, “Response of integrated nutrient management on nutrient content as well as uptake of buckwheat varieties and its residual effect on mung bean under terai region of West Bengal” was conducted during rabi season of 2015-16 and 2016-17 at an Instructional Farm of Uttar Banga Krishi Vishwavidyalaya, Pundibari, Cooch Behar, West Bengal to study the production potential of buckwheat- mung bean cropping sequence under different integrated nutrient management practices. The treatment consisted of three levels of varieties viz., V₁ = Himpriya, V₂ = Shimla B-1 and V₃ = VL Ugal-7 as main plot treatments and four levels of integrated nutrient management practices viz., N₁ = 100% RDF (Recommended dose of fertilizer @40:20:20 kg ha^-1 N:P₂0₅:K₂O), N₂ = 100% substitution through Vermicompost + Azotobacter, N₃ = 75% RDF and 25% substitution through Vermicompost + Azotobacter and N₄ = 50% RDF and 50 % substitution through Vermicompost + Azotobacter as sub plot treatments replicated three times in split plot design. Irrespective of different varieties, seed yield was significantly highest under Shimla B-1 over other two varieties. But Straw yield was found to be higher under the variety Himpriya followed by Shimla B-1. Seed N, P and K content was higher under the variety VL Ugal-7 followed by Shimla B-1. Higher straw N, P and K content was recorded under Himpriya which was followed by Shimla B-1. Similarly total N, P and K uptake by buckwheat were recorded highest under Shimla B-1 and lowest were recorded under VL Ugal-7. Seed and straw N, P and K content including total uptake by buckwheat was higher under combined application of 75% RDF and 25% substitution through Vermicompost + Azotobacter and the lowest was under the treatment receiving 100% substitution through Vermicompost + Azotobacter. Similarly, during summer season the residual effect of VL Ugal-7 applied to rabi buckwheat recorded highest seed and straw yield as well as nutrient content (N, P and K) and their uptake which was followed by Himpriya. Seed and straw yield as well as nutrient content (N, P and K) and their uptake by mung bean was obtained highest at application of 100% substitution through Vermicompost + Azotobacter during both the years of experimentation which was followed closely by 50% RDF and 50 % substitution through Vermicompost + Azotobacter.

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