Soil Characteristics and Pedoclimatic Evaluation of Rainfed Sorghum (Sorghum bicolor (L.) Moench) in the Mayo-Lemié Division, South-Western Chad

Table 3

Physicochemical characteristics of the studied soils.

Profile	M3			M2			M1
Depth (cm)	0–26	26–156	>156	0–30	30–75	75–215	0–11	11–80	80–154	>154
Texture (%)
Clay	12.00	16.00	21.50	21.5	20.00	12.00	9.00	52.00	12.00	29.5
Silt	11.50	9.59	10.50	4.50	7.00	8.00	22.00	27.00	25.00	9.00
Sand	76.50	74.50	68.00	74.00	73.00	80.00	69.00	21.00	63.00	61.5
Textural class	Loamy sand	Loamy sand	Sandy clay loam	Sandy clay loam	Sandy clay loam	Sandy loam	Sandy loam	Clay	Sandy loam	Sandy clay loam
Organic carbon (%)	2.29	3.35	1.30	2.67	1.35	1.30	1.06	1.80	1.45	1.29
Organic matter (%)	3.93	5.76	2.23	3.90	2.32	2.23	1.82	3.09	2.49	2.21
Total nitrogen (%)	0.27	0.22	0.12	0.27	0.22	0.12	0.08	0.25	0.12	0.014
C/N	3.93	15.22	10.88	9.88	6.13	10.83	13.25	7.2	12.00	92.14
pH H2O (1/2.5)	6.3	6.0	6.2	7.00	5.9	5.7	6.3	6.5	6.8	6.7
pH KCl (1/2.5)	5.3	5.1	5.6	6.1	4.8	4.4	5.2	5.4	5.8	5.1
P Bray II (ppm)	1	1	0.5	1.00	1.00	0.5	0.36	0.15	0.31	0.17
Exchangeable bases (meq/100 g of soil)
K^+	0.19	0.19	0.19	0.63	0.51	0.31	0.63	0.37	0.27	0.37
Na^+	0.32	0.20	0.21	0.91	0.32	0.32	0.51	0.42	0.31	0.49
Ca^++	8.25	6.72	4.62	9.80	7.32	6.08	3.34	4.40	2.32	2.35
Mg^++	1.92	1.76	4.8	2.40	4.96	4.80	1.32	1.48	1.71	0.64
Sum of bases	10.88	9.19	10.13	13.74	13.11	11.51	5.80	6.67	4.61	3.85
Base saturation (%)	37.67	42.38	49.72	41.33	56.31	48.00	32.15	30.54	26.13	15.92
CEC7 (meq/100 g of soil)	28.88	21.68	20.37	33.24	23.28	24.08	17.84	21.84	17.64	24.18
CEC (meq/100 g of clay)	136	108	169	154	116	200	198.2	42.00	147.00	81.96
EC (ms/cm)	0.5	0.01	0.02	0.6	0.01	0.02	0.01	0.01	0.01	0.02
ESP (%)	1.1	0.9	1.0	2.73	1.37	1.32	2.80	1.90	1.75	2.02