AGROCHEMICAL AND PHYSICOCHEMICAL PROPERTIES OF IRRIGATED MEADOW-TAKYR SOILS LOWER REACHES OF THE ZARAFSHAN RIVER

The article presents data on the content of agrochemical and physico-chemical, absorption capacity, composition of water-soluble salts, carbonate content of irrigated meadow-takyr soils in the lower reaches of the Zarafshan River. The article highlights the agrochemical, physicochemical properties of irrigated meadow-takyr soils of the lower flowing river. Zarafshon. The results of the study showed that in the profile of irrigated meadow-takyr soils there are excretions of iron oxides, which indicates an earlier, hydromorphic stage of these soils. Irrigated meadow-takyr soils contain 0.95-1.12 % humus, to the bottom the amount of humus drops sharply to 0.66 %. Nitrogen in the upper horizons fluctuates 0.06-0.08 %, its content is evenly distributed throughout the soil profile. Mobile forms of phosphorus are average and increased-provided. Its content in the arable horizon varies within 50-60 mg/kg of soil. The availability of mobile potassium is average 209.0 - 260.1 mg/kg of soil. Absorption capacity in irrigated meadow-takyr soils varies across horizons within 7.8 mg/eq. per 100 grams of soil. The composition of the absorbed bases is dominated by magnesium (Mg) cations, which is 41.7-57.0 %, then calcium (Ca) is 36.7-53.3 %, potassium (K) is 4.5-5.3% and sodium (Na) 0.3-.0 % of the sum of absorbed bases. The absorbed bases are dominated by magnesium (Mg) cations, which is 41.7-57.0 %, then calcium (Ca) is 36.7-53.3 %, potassium (K) is 4.5-5.3 % and sodium (Na) 0.3-.0 % of the sum of absorbed bases. In the old irrigated meadow-takyr soils occurs magnesium alkalinity is highly carbonate. These soils have a rather high moisture capacity and low water permeability, slopes to crust formation.

1. Pochvy. Opredeleniye podvizhnykh soyedineny fosfora i kaliya po metodu Machigina v modifikatsii TsINAO. GOST. 26205-912. - S. 1-8.

2. Instruktsiya k metodu «Pochvy. Opredeleniye organicheskogo veshchestva» «Opredeleniye organicheskogo veshchestva po metodu Tyurina» GOST.26213-91. - S. 1-3.

3. Pochvy. Opredeleniye nitratov ionometricheskim metodom. GOST.26951-86 - S. 1-7.

4. Metody agrokhimicheskikh analizov pochv i rasteny Sredney Azii. (izdaniye 5-e dopolnennoye). - Tashkent, 1977. - S. 152-156.

5. Metody laboratornogo opredeleniye granulometricheskogo i mikroagregatnogo sostava OzDSt 817-97. - S. 1-23.