CHANGE IN THE FERTILITY OF MOUNTAIN-VALLEY LIGHT-CHESTNESS SOILS OF THE ISSYK-KUL BASIN
The purpose of the study is to study the dynamics of a qualitative change in the fertility of mountain-valley light chestnut soils of the Issyk-Kul region and to identify the causes of the development of negative processes. The object of the study was the mountain-valley light chestnut arable soils of the Issyk-Kul basin. The study was conducted at stationary observation points, the main selection criteria of which were the soil types and subtypes, their soil varieties, dominant in Issyk-Kul and Zhety-Oguz regions. The results of the first monitoring study showed that on a stationary site of mountain-valley light chestnut soils of some economic entities of the Issyk-Kul depression, a decrease in humus content in soils by 28% by 2008 was observed over a 10-year period. The main reasons were erosion processes and anthropogenic factors, as well as a reduction in the application of mineral fertilizers, an increase in their removal with the crop, which violated the ratio of the size of the mineralization and replenishment of humus.