THE MOUNTAIN-VALLEY CHESTNUT SOILS OF THE TALAS VALLEY AND THEIR CLASSIFICATION
In this article are contained the research of the mountain-valley chestnut soils of the Talas valley and their classification. By results of researches regularity of increase of the humus content from light-chestnut to dark-chestnut is traced that is connected with the change of conditions of soil formation caused by vertical zonality of distribution of soils which is confirmed as well by literary data where it is said that the main criterion for differentiation of above-mentioned soils is the degree of the humus content.