Fuzzy Logic Expert System for Classifying Solonchaks of Algeria

Table 5

Correlations between indices of Solonchaks (Is), Calcisols (Ic), and Gypsisols (Ig) and different diagnostic criteria.

Relations	df	r	R^2
Is, ECe	192	0.76	0.58
Is, E	192	0.01	0.0001
Is, (E × ECe)	192	0.49	0.24
Ig, gypsum	192	0.7	0.49
Ig, E	192	0.06	0.04
Ig, (E × gypsum)	192	0.6	0.36
Ic, E	192	0.04	0.002
Ic, SC	192	0.7	0.5
Ic, calcium carbonate equivalent (CE)	192	0.77	0.6

Note. Significant at probability ; r: coefficient of correlation; R: coefficient of determination; df: degree of freedom.