Response of Sorghum bicolor L. to Residual Phosphate on Two Contrasting Soils Previously Planted to Cowpea or Maize
Table 5
Effects of previous crop soil P sources on fresh and dry shoot weight (g/pot) and RAE (%) of sorghum in the second cropping.
Treatment
Fresh shoot weight (g/pot)
RAE (%)
Dry shoot weight (g/pot)
RAE (%)
Previous crop soil P sources
Cowpea strongly acidic soil P0
12.92
—
2.30
—
Cowpea strongly acidic soil MRP
8.87
250.00
1.36
120.51
Cowpea strongly acidic soil SRP
12.77
9.26
1.75
70.51
Cowpea strongly acidic soil SSP
11.30
100.00
1.52
100.00
Cowpea slightly acidic soil P0
14.33
—
1.85
—
Cowpea slightly acidic soil MRP
16.79
36.55
3.03
231.37
Cowpea slightly acidic soil SRP
15.49
17.24
2.36
50.00
Cowpea slightly acidic soil SSP
21.06
100.00
2.87
100.00
Maize strongly acidic soil P0
10.98
—
1.21
—
Maize strongly acidic soil MRP
12.17
ND
1.42
123.53
Maize strongly acidic soil SRP
10.62
13.09
1.61
235.29
Maize strongly acidic soil SSP
8.23
100.00
1.38
100.00
Maize slightly acidic soil P0
14.57
—
1.63
—
Maize slightly acidic soil MRP
17.02
371.21
1.78
ND
Maize slightly acidic soil SRP
16.34
268.18
1.68
ND
Maize slightly acidic soil SSP
15.23
100.00
1.48
100.00
LSD (5%)
2.66
0.44
P0: control, MRP: Morocco rock phosphate, SRP: Sokoto rock phosphate, SSP: single superphosphate, NS: not significant (), ND: not determined, and RAE = [(GRP − CONTROL/SSP − CONTROL) × 100]%.
