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Phosphorus Availability to Corn as Affected by Granulating Manganese with Ortho‐ and Pyrophosphate Fertilizers
Author(s) -
Giordano P. M.,
Mortvedt J. J.
Publication year - 1969
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1969.03615995003300030035x
Subject(s) - pyrophosphate , chemistry , manganese , phosphorus , phosphate , polyphosphate , extraction (chemistry) , ammonium polyphosphate , solubility , nuclear chemistry , agronomy , biochemistry , raw material , organic chemistry , biology , enzyme , chromatography
The presence of MnSO 4 at a level of 10% Mn in granular ammonium polyphosphate (APP) and triammonium pyrophosphate (TPP) significantly reduced corn ( Zea mays L.) forage yields and P uptake relative to treatments where P and Mn were applied separately in greenhouse pots. A significant reduction in P uptake resulted when MnSO 4 was combined with monoammonium phosphate (MAP), but no yield reduction occurred. Chemical extraction of the fertilizers indicated that the solubilities of both P and Mn were reduced when MnSO 4 was granulated with APP or TPP. A compound of very low solubility, Mn(NH 4 ) 2 P 2 O 7 · 2H 2 O, was identified as the principal reaction product. Accordingly, movement of P in soil was restricted to a greater extent when MnSO 4 was combined with TPP than with MAP.