The research was carried out in the agroecological site of the city of Yurimaguas, 8.5 km from the Yurimaguas - Tarapoto highway, which has the title "Nitrogen dose on the agronomic and nutritional characteristics of Zea mays L. forage (hard yellow corn). , var. Marginal 28 tropical - Yurimaguas - Peru". The applied inorganic fertilizer was urea (46% nitrogen). The cutting time was 60 days after sowing with botanical seeds, in plots of 4.5 m2 of area and 161.5 m2 of total area, established in an Ultisol soil. The statistical design used was a Design of Block Completely Random (DBCA), with four treatments and four repetitions, using the statistical package of Inforstat, the treatments under study were: T0 (0 kilos of nitrogen / ha), T1 (80 kilos of nitrogen / ha), T2 (160 kilos of nitrogen / ha) and T3 (240 kilos of nitrogen / ha). For these agronomic characteristics the one that occupied...