INFLUENCE OF ANTHROPOGENIC IMPACT ON THE GROUP COMPOSITION OF HUMUS IN IRRIGATED SOILS OF THE ZARAFSHAN VALLEY

Abstract

The main soil types of the Zeravshan Valley are sierozem and meadow soils, as well as their subtypes and varieties. The bulk of agricultural crops are cultivated in these soils. Each type, subtype and variety of soil differs within the taxon in terms of the degree of cultivation and the duration of irrigation. All this is reflected in their group composition of humus, which is of great importance in their fertility. Nevertheless, the group composition of the soils of the Zeravshan Valley is very poorly studied and its study is relevant. The study used the generally accepted methods for studying humus and its group composition.