This job was made in order to determiner the best alternative in productivity in association cultivations the corn with peanuts, the variety used was: corn (Marginal 29 tropical) y Peanuts (Blanco Tarapoto), with diferentes densities of seeding (it is indicated in the item 4.3.1.3). Thesis work, was carried out in the land cattle Experimental Station "El Porvenir" located in the Valley of "Bajo Mayo" bolongig to Province and Region san Martin (Perú) it's geographical location is at 16°26' west longitud and 06°34' sout to Green Wich latitud and is at 356 m above sea level. For the execution of work was used land using the completa Randomized Block (BCR), desing with six treatments and Four repetitions, it whose result was Evaluated throu9h Duncan multiple test and variation analysis. The seeding was made in traditional system droping four seed seach hole, to eliminate after 2 plants fo...