QASHQADARYO VILOYATI QAMASHI TUMANI LALMI TIPIK BO‘Z TUPROQLARINING SINGDIRISH SIG‘IMI VA SINDIRILGAN KATIONLAR TARKIBI

Abstract

The article presents data on the cation exchange capacity and the composition of exchangeable cations in typical gray soils of rainfed lands under conventional tillage and No-Till technology. The cation exchange capacity ranges from 10.5 to 12.7 meq/100 g, with relatively higher values observed under No-Till conditions. A decreasing trend of this parameter is observed with increasing soil depth along the profile. Among exchangeable cations, Ca²⁺ dominates, accounting for 53–64%, which is an important factor in the formation of soil structure and aggregate stability. The Mg²⁺ content varies between 29–40% and remains in balance with Ca²⁺. The K⁺ content is low (2–4%) and is explained by the mineral composition of the soil. The Na⁺ content ranges from 3–5%, indicating that the studied soils are not saline. The implementation of No-Till technology increases the cation exchange capacity and improves the physicochemical stability of the soil. As a result, this method is effective in maintaining soil fertility and promoting sustainable agriculture in rainfed areas.