Presently work the field phase was developed in the environment of the EE. "El Porvenir" in Juan Guerra Distríct, County, Department and Regíon of San Martin, among the months of January-June of the 2000 geographically characterízed by the cordenadas 76°5 'longitud west, 6°35 'latitud south and an altitude of 356 m.s.n.m. With the objective of evaluating the system of cornleguminous association and the productivity for unit of equivalent of earth (U:E:T). The used experimental design was the design of B!Ocks Completely Randomizado (BCR) with 4 repetitions and six treatments including the monocultivos of corn and bean. The treatments in study are: T1 (com monocultivo sowed 0.80m x 0.40m), T2 (bean monocultivo sowed 0.80m x0.30m), T3 (an array of corn inserted with a bean array sowed to 1.0m x 0,50m and the bean to 1.0m x 0.30m), T4 (an array of com inserted with two bean arrays sowed...