The objective of the study was to estímate the quantification of air biomass in forest plantations 6,5 years old, multietáneos, of the species Shaina Colubrina glandulosa Perk, located in the sector Lagoon Venice", District of the Band of Shilcayo, County and Region of San Martin - Peru. Coordinated Geographical: 06º 32' South Latitude and 76º22' Longitude West, half altitude of 350 msnm. The biomass was determined by means of a combination of the crop methods and alométrico. In the forest three parcels of inventory silvícola settled down, 38 trees were selected far a destructive sampling, distributed in three phases of growth: Latizal under, high Latizal and Fusta!. Each tree was turned, trozado and separated in the component bark and wood of the shaft, foliage and branches of the glass, being obtained its dry pesos. With 23 trees of the forest, equations alométricas were adjuste...