Growth and Nutrient Use Efficiencies of Yams (Dioscorea spp.) Grown in Two Contrasting Soils of West Africa

Table 1

Mean values ± standard errors of selected soil parameters (0–20 cm) of the forest and savanna sites.

Soil properties	Forest site	Savanna site
	0–20 cm	0–20 cm
Coarse sand (g kg^−1 soil )	380 ± 9	472 ± 6
Fine sand (g kg^−1 soil )	283 ± 6	297 ± 10
Coarse silt (g kg^−1 soil )	77 ± 3	78 ± 4
Fine silt (g kg^−1 soil)	46 ± 5	34 ± 2
Clay (g kg^−1 soil)	205 ± 13	108 ± 7
pH water	6.35 ± 0.12	6.00 ± 0.13
Total N content (g kg^−1 soil)	1.05 ± 0.08	0.46 ± 0.04
Soil organic C content (g kg^−1 soil)	12.08 ± 0.92	6.46 ± 0.50
Bicarbonate extractable P (mg kg^−1 soil)	13.4 ±0.87	9.4 ± 0.72
Exchangeable K (cmol+ kg^−1 soil)	0.17 ± 0.03	0.11 ± 0.02
Cation exchange capacity (cmol+ kg^−1)	5.7 ± 0.4	2.4 ± 0.31