Effect of Forest Amelioration on the Content of Essential Nutrients in Meadow-Chestnut Soil in Microdepressions of the Northern Caspian Semidesert
The contents and reserves of unexchangeable potassium and available and total phosphorus and the nitrifying capacity of meadow-chestnut soil in the clay semidesert of the Northern Caspian region subjected to forest amelioration measures developed at the Dzhanybek Research Station of the Institute of Forestry, Russian Academy of Sciences, remained unchanged for half a century. The contents and reserves of humus, total nitrogen, and exchangeable potassium decreased. The major changes were mainly related to the plowing and fallowing of soils.