Response of Sorghum bicolor L. to Residual Phosphate on Two Contrasting Soils Previously Planted to Cowpea or Maize

Table 2

Effects of soil characteristics and phosphorus sources on plant height, stem girth, and leaf area of maize in the first cropping.

Treatment	Height (cm)	← Stem girth (cm) →			Leaf area (cm^2)
	Weeks after planting
	6	4	5	6	6
Soil description/characteristics
Strongly acidic sandy clay loam		0.42	0.64	0.77	121.15
Slightly acidic loamy sand		0.63	0.94	1.09	169.42
LSD (5%)		0.08	0.09	0.10	22.15
P sources
P0		0.43	0.65	0.83	139.31
MRP		0.57	0.83	0.98	149.23
SRP		0.51	0.77	0.89	132.78
SSP		0.59	0.90	1.03	159.82
LSD (5%)		0.11	0.13	0.14	NS
Soil P sources
Strongly acidic soil P0	39.10	0.23	0.37	0.51	78.77
Strongly acidic soil MRP	52.80	0.52	0.77	0.87	128.99
Strongly acidic soil SRP	52.07	0.43	0.65	0.80	122.04
Strongly acidic soil SSP	55.53	0.50	0.78	0.92	154.82
Slightly acidic soil P0	63.67	0.62	0.93	1.15	199.86
Slightly acidic soil MRP	64.47	0.62	0.90	1.10	169.46
Slightly acidic soil SRP	59.90	0.58	0.89	0.98	143.53
Slightly acidic soil SSP	66.67	0.68	1.02	1.13	164.82
LSD (5%)	15.67	0.15	0.19	0.19	44.31

P0: control, MRP: Morocco rock phosphate, SRP: Sokoto rock phosphate, SSP: single superphosphate, and NS: not significant ().