The oresent invesfürntion work was carried out with the obiect and to detennine JI ........ .... that fertilizer dose Nitrogenado under watering and economic of the best results in yield and qualily of toba eco in the area of the Under M ay M orales-Tarapoto, Department of San Martín~ of conditions ecologicai Tropical D1y Forest! with an annuai precipitation of l 087 mm> abnorm.ally distributed. The c:ampaign corre.spou