AGROCHEMICAL AND AGROPHYSICAL CHARACTERISTICS OF RAIN-FED DESERT SANDY SOILS ON THE UPLAND PLAINS OF THE NURATA DISTRICT OF THE NAVOI REGION

This article presents agrochemical and agrophysical characteristics of rain-fed desert soils spread on the upland plains of Nurata district of Navai region. Geomorphologically, it is possible to distinguish a few districts in the studied territories. The main areas under study are located on the plain with absolute heights of 250-400 above sea level. The soil-forming rocks of this geomorphological area are alluvial-proluvial deposits overlain by a sandy layer of Aeolian origin. Desert-sandy soils are characterized by weak differentiation of the profile into genetic horizons. According to the profile, the amount of humus decreases gradually, but its significant content is observed in the upper horizons of 0.35-0.56 %. The content of gross phosphorus in the upper horizon is 0.65-0.80 %. Data the soil is insufficiently provided with waste phosphorus 12.2-12.5 mg/kg. The availability of potassium exchange is low 77.1-132.6 mg/kg. The CO₂ content of carbonates from the surface is low 4.6 %. Down the profile, the percentage of CO2 gradually increases, reaching a maximum at a depth of 40-70 cm 9-10%. In terms of mechanical composition, coarse sand fractions predominate on rainfed desert sandy soils; Particularly, high content of coarse sand fraction (54.20-59.7 %). Silty fraction (4.24-10.5 %). Physical clay is in soils (11.66-20.46 %). Microaggregation is low and at the upper horizons it is up to 2.57 %, and down the profile it increases to 14.5 %. Rainfed-desert sandy soils are characterized by a low absorption capacity, which, according to the sum of absorbed bases, is 4-6 mg / eq per 100 g of soil. The capacity of the agreement depends on the content of organic and mineral colloids, the reaction of the soil solution.

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