Response of Sorghum (Sorghum bicolor L.) to Residual Phosphate in Soybean-Sorghum and Maize-Sorghum Crop Rotation Schemes on Two Contrasting Nigerian Alfisols

Table 4

Influence of P-sources on biomass yield (g/pot) and relative agronomic efficiency (RAE) (%) of maize/soybean plants in the first cropping.

Treatment	Dry biomass (g/pot)	RAE (%)
Phosphate fertilizers	Maize plant
Control	11.67
Morocco Rock	18.43	114.38
Sokoto Rock	12.65	16.58
Single super	17.58	100
LSD (5%)	2.39
	Soybean plant
Control	8.24
Morocco Rock	11.42	85.03
Sokoto Rock	4.56	ND
Single super	11.98	100
LSD (5%)	2.49

RAE = relative agronomic efficiency of the Phosphorus- (P-) sources = [((yield of GRP − yield of Control)/(yield of SSP − yield of Control)) × 100]%.
NS = nonsignificantly different at .
LSD = least significant difference (5%) and ND = not determined.