Effect of the meliorative state of irrigated lands of the Chu River Valley on the water-salt regime and yield.

chimie du sol contenido mineral crop yield crops cultivos groundwater table humus irrigated soils loam soils mineral content plante de culture rendement des cultures rendimiento de cultivos sales salinidad salinity salts sel soil chemicophysical properties soil chemistry soil toxicity sol sablolimoneux suelo franco suelo irrigado sulfate sulfatos sulphates toxicidad del suelo urss ussr