due to its resistance to drought, forage sorghum used as silage, is one of the most common feeds for ruminants on farms in the northern part of the state of minas gerais. the present research evaluated three planting densities and three forms of row spacing to determine their efficiency in the production of mass under the semiarid climatic conditions. two experiments were conducted in two agricultural years. in each year, the experiments were conducted in contiguous areas using row spacing of 50, 70 and 90 cm and three different plant densities. each experiment used a random blocks design in a 4 x 3 factorial scheme with three replicates, four cultivars and three sowing densities. the viability of reducing the space between rows was found to be dependent on the characteristics of each cultivar as well as the climatic conditions. increasing sowing density resulted in a proportional reduction in the production of dry matter.