Influence of liqorice growing on the salt composition of low-fertility soils of the Syrdarya region, Uzbekistan

Abstract

The article describes the influence of licorice on hard-to-reclaim lands, in order to obtain valuable roots and improve soils. The creation of a salt regime of the soil on irrigated lands is achieved only through the implementation of a complex of reclamation and agrotechnical measures, and the most important is the cultivation of licorice. For a comprehensive study of the effect of licorice on soil properties, reference sections were laid in key areas up to the groundwater table, and areas with different durations of licorice cultivation were selected. The following types of work were carried out in the field: description of the soil and soil profile, moisture content of soils and soils, selection of soil samples. Under laboratory conditions, the composition of water-soluble salts was determined. When planting licorice from the first year, a decrease in salt content is observed, by the fourth year of growing licorice, the content of dense residue ranges from 0.735 to 0.890%, by the sixth year, the soil profile to the groundwater level (GWL) turned out to be slightly saline along the profile, the content of dense residue ranges from non-saline to moderately saline degree (0.270-1.200%). With an increase in the limitation period of cultivation in the soil under licorice, the content of the chlorine ion decreases. The degree of alkalinity is strongly influenced by the content of magnesium and sodium in the soil. According to the content of total alkalinity under cultures of different age of growing licorice, there are no special differences in the profile. With an increase in the prescription of licorice cultivation, the amount of toxic salts decreases.