DISTRIBUTION OF CALCIUM AND ITS RESERVE FORMS IN WIDESPREAD IRRIGATED GRAY MEADOW SOILS OF THE SYRDARYA REGION

The article examines the uneven distribution of calcium in reserve (general, potential, close and labile) forms in irrigated and gray-earth-meadow soils of the experimental section of the NIISSAVKH of the Gulistan district of the Syrdarya region and the farms Sokhil and Ak altin in irrigated meadow soils the form of a close reserve in the soil profile is 310 mg per 100 gr of soil. The upper layer of highly saline, medium loamy soil gradually decreases at a depth of 60-76 cm. layer. The labile calcium reserve in irrigated serozem-meadow, highly saline, medium loamy soils varies from 175 to 260 mg per 100 g of soil, as well as the potential reserve form of calcium both in irrigated meadow soils and serozem-meadow soils, fluctuate in the range from 98.04% to 91.65 %. A high concentration of gypsum and CaCO3 carbonates in the soil profile, the potential reserve form of calcium in soils prevails over other types of reserve forms of calcium and its potential reserve is fluctuating from 14001 to 4040 mg per 100 g of soil, the experimental field NIISSAVH, comparing the soils of the “Sahil” and “Ak altin” is 1.7 times more calcium than in saline soils, and 2.5 times more in irrigated meadow highly saline soils, that is, the lobular form prevails due to the abundance of calcium salts in saline soils