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P Uptake by Wheat and Resin‐Extractable Phosphate after Incubation in Soil Derived from Volcaninc Ash 1
Author(s) -
Zunino H.,
Peirano P.,
Aguilera M.,
Caiozzi M.
Publication year - 1973
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1973.00021962006500050021x
Subject(s) - incubation , soil water , chemistry , phosphate , incubation period , human fertilization , zoology , agronomy , environmental chemistry , nuclear chemistry , biology , soil science , geology , biochemistry
The heavy fertilization of volcanic ash derived soils required to obtain adequate yields demands good routine methods to test availability of phosphate in these soils. Therefore a resin‐extractable P method was tested against a biological one. Working with three selected soils, samples of each soil were fertilized with 0, 22, 66, and 132 ppm P as Ca(H 2 PO 4 ) 2 ‐H 2 O and P determined after 0, 30, 60, 120 and 180 days of incubation. A close P added/P uptake correlation is maintained in nearly all soil‐samples after any incubation period studied. However, added P and resin‐extractable P were directly related up to 60 days of incubation only. This seems to be due to the formation of new P compounds as a result of the strong P fixing properties of these soils. These P compounds may have a different relative availability to plants than to chemical extractant as compared to the Ca(H 2 PO 4 ) 2 ‐H 2 O initially added.