To evaluate the relative merits of grain sorghum hybrid cultivars and their interaction with environment, seven hybrids were grown in comparison with two established varieties (Meloland and D.D. 38) and one experimental variety in trials conducted at the Imperial Valley Field Station. The trials were planted April 15, June 1, and July 15 in each of five years, 1962 to 1967, on 40-inch beds with five replications. Cultural practices were typical for the Imperial Valley area, except plants were hand-harvested.