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Summary
XEROPHYTIC-FOREST CHERNOZEMS: NATURAL POTASSIUM RESERVES
V.E. Alekseyev, V.V. Cherbari, A.N. Burghelya, E.B. Varlamov
Xerophytic forest chernozems have a large total reserve of potassium, composing in the form of К2О up to 2500 mg per 100 g of soil. High available reserve of exchange potassium in the turf horizons up to 3 % from the total. The middle reserve of potassium enclosed in clay minerals in these soils also increases to the upper horizons and constitutes 600-1200 mg per 100 g. Potential reserve associated with the primary minerals, however, increases in the direction of rock and by its size substantially exceeds the middle reserve of potassium constituting 1100-1700 mg per 100 g.