Fuzzy Logic Expert System for Classifying Solonchaks of Algeria

Table 2

Physical quantities of soil groups recommended by WRB [14].

Soil groups (output variables)	Variables used [14] (input variables)
Solonchaks	(i) ECe (dS/m)
	(ii) E (cm)
	(iii) ECe × thickness of the diagnostic horizons (ECe × E)
Calcisols	(iv) Calcium carbonate equivalent (%)
	(iv) E (cm)
	(vi) Secondary carbonate (%) by volume
Gypsisols	(vii) Gypsum content (%) (by mass)
	(viii) E (cm)
	(ix) Thickness of diagnostic horizons × content in gypsum (E × gypsum)