Phosphorus response of grain sorghum in the Guinea savanna of Nigeria as influenced by rates,placement and plant spacing

Improved grain sorghum (Sorghum bicolor L.) Moench responded to applied P up to 22 kg P ha^–1 on an Alfisol situated in the Nigeria savanna. Hill placement of phosphorus fertilizer gave higher grain yield of sorghum, one thousand grain weight, P content of leaves and residual phosphate than furrow P application. Grain yields were observed to be higher at population of 55 555 plants ha^–1 than at 31 750 and 24 700.