For maximum grain production, moderate to high fertility is suggested although grain sorghum will grow on lower fertility soils with better results than corn. Fertilize using soil test recommendations. If a soil test is not available, fertilize at similar rates to grain corn. Grain sorghum can produce moderate amounts of silage and should be harvested when seed is in the milk to hard dough stage which is the proper moisture level for ensiling. Avoid possible nitrate and prussic acid poisoning by not applying heavy rates of nitrogen prior to expected drought periods; do not harvest drought damaged plants within 4 days following a
good rain; do not cut within 7 days of a killing frost; cut at a higher stubble height if under stress since nitrates accumulate in the lower stalk, and delay feeding silage 6 to 8 weeks after ensiling to allow prussic acid to dissipate. Never feed forage from grain sorghum to horses.