Factors of soil formation and their evolution in the south of the Zerafshan valley

Bukhara State University, Street Mukhammad Ikbol, 11, 200118, Bukhara, Uzbekistan

^* Corresponding author: s.m.nazarova@buxdu.uz

Abstract

In article is stated main groundforming (the geomorphological-hydra geological land reclamation, climatic and anthropogen) factors, describes the evolution of soils in the lower part. In Zerafshan valley are chosen 3 geomorphological regions. Differ the raised contents a magnesium, high water table on irrigated territory in roast time and heavy expences them on evaporation. Economic activity of the person is reflected and on climate, and on hydralogical condition to surfaces of the land. As a result of reclamation measures, takyr-meadow, old-fallow meadow with bog-meadow and salt marshes, gray-brown soils were transformed into old-irrigated meadow alluvial soils. The increase in irrigated land was due to the development of new, previously unrevealed territories.