GRAY FOREST SOILS OF MOLDOVA'S CODRY: NATURAL RESERVES OF POTASSIUM

Abstract

At first a comparative study of the natural reserves of potassium in the gray forest soils and xerophytic forest- black earth showed that the general reserve is very high (1999-2968 mg/100 g of soil) and higher than that in the forest chernozems (2214-2474 mg/100 g of soil). The reason for this potential reserve and it is anomalously high content of mica, followed by manifestations of heterogeneity of soil-forming rocks. Direct reserve potassium in gray forest soils are 1.5-2 times lower (7-30 mg/100 g), and the proximal reserve (620-1069 mg/100 g) was comparable to that in the xerophytic forest - chernozem. The pattern of distribution of reserves to the profile in gray forest soils is influenced by soil-genetic factors and geological nature.