Field experiments were conducted during 2007-2010 at Patna to enhance the forage yield in rainfed farming system in split plot design with six forage-based crop sequences during rainy, winter and summer seasons respectively viz., sorghum + cowpea-oat + mustard-sorghum + cowpea (C1), Maize + cowpea-oat + mustard-maize + cowpea (C2), Hybrid napier + cowpea-hybrid napier + mustard-hybrid napier + cowpea (C3), Subabul + Alley fodder crops as in C1 (C4), Subabul + Alley fodder crops as in C2 (C5), Subabul + Alley fodder crops as in C3 (C6) in main plots and five nutrient management practices (computed on 150 kg ha-1 N-equivalent basis) viz., Farm Yard Manure (FYM), goat manure, vermicompost, cow urine and control (no application of any source) as sub-plots. To achieve maximum productivity (121 t ha-1), vermicompost when applied @ 150 kg N ha-1 to rainy season crops viz., Subabul + alley fodder crops hybrid napier + cowpea could meet the nutrient requirement of whole cropping system C6, where subabul continued as alley crop during winter and hybrid napier was inter cropped with mustard while during summer the hybrid napier was inter cropped with cowpea could record green forage yield of 63.6, 32.5 and 25.2 t ha-1 respectively during rainy, winter and summer seasons, besides enhancing soil fertility and maximum benefit cost ratio under organic farming.