The effect on the productivity and protein contents of well-fertilized Napier, Para, Guinea, Pangola, and molasses grasses harvested every 60 days for 2 years, of cutting close to the ground (0-3 inch) or to a 7-10 inch height, was determined under typical conditions in the humid mountains of Puerto Rico. Yields of molasses grass were severely reduced by close cutting and the grass eventually disappeared from plots with this treatment. On the other hand, yields of Napier, Para, and Pangola grasses were increased 27, 25, and 56 percent, respectively, by low cutting. Although yields of Guinea grass were not strongly affected by cutting height, high cutting resulted in a better stand, faster recovery after harvesting, and less growth of weeds.Se estudió el efecto en el rendimiento de yerbas Napier, Para, Guinea, Pangola y melao, de cortarlas a una altura de 0-3 y de 7-10 pulgadas del suelo cada 60 días durante 2 años. Con corte bajo se redujo grandemente el rendimiento de la yerba melao. Sin embargo, los rendimientos de las yerbas Napier, Para y Pangola fueron marcadamente más altos con corte bajo. Aunque la altura de corte no afectó grandemente el rendimiento de la yerba Guinea, con corte alto se mantuvo más vigorosa, recobró más rápidamente después del corte, y crecieron menos malas yerbas.