A change of maintenance of mobile phosphorus in the genetic horizons of ordinary black-earth

Abstract

Ordinary black-earthes on the loess type of
heavy composition of North Steppe of Ukraine contain
the promoted amount of apatites compounds.
As a result the use of any acid methods (as GOST
26204-91 (Chirikov’s method)) has as a result the
substantial artificial overstating of estimation of the
phosphatic state of soils (on 40–80 mg of Р2О5/kg of
soil). For diagnostics of the phosphatic state of
these soils, in obedience to the requirements of
normative documents of Ukraine, it follows to use
the followings standards: DSTU 4114 (Machigin’s
method), DSTU 4727 (method of Karpinskyi-
Zam’yatina) and DSTU ISO 11263 (Olsen’ method).
For the receipt of high harvests with high
quality on ordinary black-earthes of North Steppe of
Ukraine it is necessary to bring in not less phosphoric
fertilizers, than on other soils of country based
on information of the ground diagnostics.