Two experiments were planted at each location. One experiment was designed to determine silage yield and various components of forage quality while the other experiment was designed to determine grain yield of each hybrid. Plots consisted of two rows spaced 38 inches apart and 25 feet long in the silage yield experiment and two rows spaced 38 inches apart and 16.75 feet long in the grain yield experiment. Experimental design was a randomized complete block with three replications.
Seed of all entries were supplied by participating companies and packaged for planting at rates of 22,000 or 26,000 seeds per acre as specified. A John Deere 7100 4-row planter equipped with 32 cell cone units was used for planting. Established stands were not thinned. Phosphorus, potassium, and lime were applied according to soil test recommendations. Nitrogen was applied at 180 pounds per acre. Weeds were controlled with herbicides currently registered for use on corn with strict adherence to all label instructions.