Fertilizer nutrient needs for grain sorghum are based on expected yield, nutrient levels in the soil and fertilizernitrogen costs. Grain sorghum following alfalfa is not likely to benefit from applied nitrogen unless the alfalfa stand was poor. If the alfalfa stand was less than 30 percent of full stand or less than 1.5 plants per square foot, use the equation for estimating nitrogen need for sorghum following a cereal crop and then subtract 90 lb of nitrogen as the nitrogen credit due to the alfalfa crop.

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