PHOSPHATE STATUS OF THE AGROGENICALLY TRANSFORMED ALLUVIAL MEADOW SOILS IN CENTRAL RUSSIA

A specific combination of natural and agricultural factors has resulte d in the formation of positive phosphate anomalies (phosphatization) i n 70% of neutral alluvial soils of the Oka and Moskva river basins. Th e phosphatization of the plowed soil layer is accompanied by the accum ulation of mineral phosphates (Ca-P-I; Ca-P-II, Al-P, and Fe-P) in all soil layers to a depth of 1 m. The accumulation maximums are confined to the present and buried humus horizons. Changes in the soil phospha te status are accompanied by corresponding changes in the natural cycl es of other chemical elements (N, K, Ca, Mg, V, Fe, Zn, Cu, Cd). This results both in some negative and positive ecological consequences.