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

Table 6

Influence of the soils, P-source, or crop effects on biomass yield (g/pot) of Sorghum plants in the second cropping.

Treatment	Dry biomass (g/pot)	RY/RAE	Dry biomass (g/pot)	RY/RAE
	⁢First cutting		⁢Second cutting
Crop effects
Maize-Sorghum	1.68	5.17	0.05	0.15
Soybean-Sorghum	2.36	100	0.18	100
LSD (5%)	0.33		0.1
Soil acidity level
Strongly acidic	1.7	4.93	0.09	0.26
Slightly acidic	2.34	100	0.13	100
LSD (5%)	0.33		NS
Phosphate fertilizers
Control	2.1		0.12
Morocco Rock	2	ND	0.11	50
Sokoto Rock	1.92	ND	0.13	ND
Single super	2.07	100	0.1	100
LSD (5%)	NS		NS

RAE = relative agronomic efficiency of the Phosphorus- (P-) sources = [((yield of GRP − yield of Control)/(yield of SSP − yield of Control)) × 100]%.
RY = relative yield of test crop (maize or soybean) = [(yield of the crop on a particular soil type/maximum yield) × 100]%.
NS = nonsignificantly different at .
LSD = least significant difference (5%) and ND = not determined.