Distribution of soil phosphorus fractions in phosphorus-fertilized hydric dystrandept and typic palendult

Isarog has distinctly high total P. Total P of this soil is largely made up of organic P particularly in the surface layer wherein total P exceeds 2000 mg/kg and organic P is more than 1300 mg/kg. Total P and inorganic P generally increased while inorganic P decreased as the level of applied P varie...

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Bibliographic Details
Published inPhilippine Journal of Crop Science (Philippines) Vol. 13
Main Author Evangelio, F.A. (Visayas State Coll. of Agriculture, Baybay, Leyte (Philippines). Philippine Root Crop Research and Training Center)
Format Journal Article
LanguageEnglish
Published 01.05.1988
Subjects
ENGRAIS PHOSPHATE
FERTILIZANTES FOSFATADOS
FOSFORO
PHOSPHORE
SOL
SUELO
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Summary:Isarog has distinctly high total P. Total P of this soil is largely made up of organic P particularly in the surface layer wherein total P exceeds 2000 mg/kg and organic P is more than 1300 mg/kg. Total P and inorganic P generally increased while inorganic P decreased as the level of applied P varied from zero to very high. The magnitude of amounts of the inorganic P fractions in both the control and P fertilized plots of Isarog showed the general order: Al-PFe-PRSPCa-P Occ P for Blocks T, R and Q in Panicuason. Block F in Palestina also exhibited the predominance of Al-P but reductant-soluble P gave consistently higher values than Fe-P; likewise, occluded P consistently exceeded Ca-P. In contrast to Isarog soil, total P in Castilla is so low that it is generally exceeded by the inorganic P in Isarog soil. Total P and the major P fractions increased with increasing level of applied P, but decreased with soil depth. The order of dominance of each of the inorganic P fractions in Castilla under various levels of applied P is as follows: RSPOccPFe-PCa-P.
Bibliography:P35
8910298
F04
ISSN:0115-463X