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

Table 5

Land suitability evaluation for the production of sorghum.

Characteristics	Evaluation of M3 for the production of Sorghum				Evaluation of M2 for the production of Sorghum				Evaluation of M1 for the production of Sorghum
	Values	Classes	Limitations	Parametric values	Values	Classes	Limitations	Parametric values	Values	Classes	Limitations	Parametric values
Topography (t)
Slope (%)	2	S1-1	1	90	1	S1-1	0	95	1	S1-0	0	100
Wetness ()
Flooding	FO	S1-0	0	100	F1	S2	2	72.5	F1	S2	4	60
Drainage	Good	S1-0	0	100	moderate	S2	2	72.5	Imperfect	S3	2	60
Physical soil characteristics (s)
Texture/structure	S	S3	3	40	SA	S1-0	0	100	C<60s	S1-0	0	100
Soil depth (cm)	>90	S1-0	0	100	>100	S1-0	0	100	>90	S1-0	0	100
Coarse fragments (%)	—	S1-0	0	100	—	S1-0	0	100	0	S1-1	0	100
CaC03 (%)	0	S1-0	0	100	0	S1-0	0	100	0	S1-0	0	100
Gypsum (%)	0	S1-0	0	100	0	S1-0	0	100	0	S1-0	0	100
Soil fertility characteristics (f)
Apparent CEC (cmol (+)kg^−1 clay)	125.41	S1-0	0	100	125.41	S1-0	0	100	85.25	S1-0	0	100
Base saturation (%)	20.41	S2	2	68.75	32.15	S2	2	74	27.69	S2	2	74.85
Organic carbon (%)	2.20	S1-0	0	100	2.20	S1-0	0	100	2.2	S1-0	0	100
pH-H2O	5.9	S1-1	0	100	6.3	S1-0	0	100	5.6	S1-1	1	85
Salinity and sodicity (n)
CEe (ms/cm)	0.2	S1-0	0	100	0.2	S1-0	0	100	0.01	S1-0	0	100
ESP (%)	0.36	S1-0	0	100	2.8	S1-0	0	100	0.6	S1-0	0	100
Suitability and calculated land index (Is)		S3sS2f		44.29		S2wf		60.47		S3wS2f		41.33