Based on combined study of the composition of soil solutions and water
extracts in Chestnut and Solonetz soils of Russia, the diagnostic fac
tors of the chemistry of salinization are revised-(> 1.0 for chloride,
0.6-1.0 for sulfate-chloride, and 0.3-0.6 for chloride-sulfate), as w
ell as the optimal (1.0-2.5 g/l) and critical (2.5-3.5 g/l) concentrat
ions of soil solutions for weakly and moderately salt-resistant crops.
Identification of a ''very weak extent of soil salinization,'' which
corresponds to 0.06-0.10 percent of the total of toxic salts in chlori
de-sulfate salinization, is proposed.