This thesis work entitled "Dose Magnecal more worm and its response in biomass production and crop yield of peanut (Arachis hipogaea L.) in Saint Martin – Peru”, with the objectives to quantify the yield and biomass in the cultivation of peanuts through the fixation of CO2, with different doses of worm in Saint Martin - Peru. (Second year of 2006). It was the economic analysis of different treatments (cost benefit). Developed in the Miraflores Estate, owned by the Universidad Nacional de San Martín, Tarapoto, road district of Bello Horizonte Shilcayo band. Design using a randomized blocks with 5 treatments and four replications. The treatments were doses of earthworm humus had the best results were obtained in terms of production, number of pods, plant height and biomass production in relation to benefit-cost treatments worm were the least regard to economic witness, was the most ec...