Response of Sorghum (Sorghum bicolor L.) to Residual Phosphate in Soybean-Sorghum and Maize-Sorghum Crop Rotation Schemes on Two Contrasting Nigerian Alfisols
Table 7
Influence of the experimental soils and P-source or crop effects and soils on dry biomass yield (g/pot) of Sorghum plants in the second cropping.
Treatment
Dry biomass (g/pot)
Dry biomass (g/pot)
Mean
Standard deviation
RAE (%)
Mean
Standard deviation
RAE (%)
First cutting
Second cutting
Soils acidity level
Phosphate fertilizer
Strongly acidic
Control
1.92
±0.52
0.11
±0.16
Morocco Rock Phosphate
1.55
±0.69
137.04
0.07
±0.08
ND
Sokoto Rock Phosphate
1.69
±0.25
85.19
0.06
±0.09
ND
Single Super Phosphate
1.65
±0.55
100
0.12
±0.20
100
Slightly acidic
Control
2.28
±0.37
0.12
±0.18
Morocco Rock Phosphate
2.46
±0.81
85.71
0.14
±0.14
ND
Sokoto Rock Phosphate
2.15
±0.60
ND
0.2
±0.28
ND
Single Super Phosphate
2.49
±1.14
100
0.07
±0.09
100
LSD (5%)
NS
NS
Crop effects
Soils acidity level
Maize-Sorghum
Strongly acidic
1.39
±0.30
4.06
0.02
±0.03
0.06
Slightly acidic
1.97
±0.29
100
0.07
±0.10
100
Soybean-Sorghum
Strongly acidic
2.01
±0.49
5.78
0.16
±0.17
0.46
Slightly acidic
2.71
±0.88
100
0.2
±0.22
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]%. NS = nonsignificantly different at and ND = not determined.
