The Phosphate Pool of Soils in the ZeyaBureya Plain
and Its Changes upon Fertilizer Application

V. F. Prokopchuk

State Agrarian University of the Far East, Politekhnicheskaya ul. 86, Blagoveshchensk, 675005 Russia

Received May 13, 2002

Abstract—Data on the distribution of total and extractable phosphorus in the profiles of the main soil types in
the Zeya–Bureya Plain are analyzed. The concentration of P₂O₅ in concretions and the clay fraction of bleached
soils and the group composition of mineral phosphates in meadow-brown chernozemlike soils are specially dis-
cussed. It is shown that long-term application of fertilizers at the rates of N24P30, N24P30K24, N42P48
(kg/ha), and N24P30 + manure (4.8 t/ha) increases the content of acid-extractable (0.2 M HCl) phosphorus; the
new phosphorus equilibria are set in 20, 30, 31, and 27 years after the beginning of fertilizer application, respec-
tively. The content of available phosphorus in fertilized soils is higher than that in the control by 8, 14, 27, and
28 mg/kg, respectively. Thus, the phosphorus supply of fertilized soils is assessed as moderate in contrast to the
low phosphorus supply of unfertilized soils.

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