With the purpose of determining the best time in sow of the system associated of cornbean with characteristic agronomic desirable for Bajo Mayo the First; it put on in execution a comparative rehearsal of times of sow of corn (Marginal T-29) and bean cowpea (Chongoyape) reaching the potential maximum of yield the time of 20 days of sow of the corn on the bean T5 (F+M 20 D.S.F.) with 5 890 Kg/ha, and the variety cowpea that it obtained the average but high of weight of 100 grains (1square15) it was the T5 (F+M 15 D.S.F) with 15.98 g. being 1 598 Kg/ha respectively. The experiment in mention you takes to 1 dig in San Martín country and Region, District of Morales in a soil vertisol, fine texture, potassium and high match and with saturation of bases, the disposition of the used experiment was completely of blocks randomized, being the sow of bean cowpea for blow to a distancing of 0.80 x ...