PHOSPHATE-POTASSIUM REGIME OF LEACHED CHERNOZEM IN THE NORTHERN FOREST-STEPPE ZONE OF THE CHELYABINSK REGION

The article presents data on the content of labile phosphorus and exchangeable potassium for six rounds of soil surveys in the Chelyabinsk region according to the agricultural land monitoring program using the example of leached medium-humic low-power clayey chernozem in sections laid in 1994 in the Chebarkul district of the Chelyabinsk region. Observations of the changes in labile phosphorus revealed a decrease in its content on virgin lands and arable land, especially in the top layer of soil. An increase in the content of exchangeable potassium was established by the sixth round of soil survey on virgin land, while on the arable land its content did not change significantly.