Assessment of methods for studying the dissolution of phosphate fertilizers of differing solubility in soil View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1994-01

AUTHORS

H. J. Di, R. Harrison, A. S. Campbell

ABSTRACT

An isotopic exchange method, based on tracer kinetic theory, was used to study the dissolution (Fin) and retention (Fout) of Phosphate (P) fertilizers in the soil. This method involves labelling of the soil with carrier-free32P-phosphate ions, and monitoring changes with time of specific activity of isotopically exchangeable phosphate in the soil as extracted by plants, and of the amounts of readily exchangeable P. To assess this method, experiments were carried out to determine the rates of release and retention of phosphate from three fertilizers, monocalcium phosphate (MCP), ground North Carolina phosphate rock (NCPR < 150µm), and 30% acidulated (with phosphoric acid) NCPR (NCPAPR), in two soils, Tekapo fine sandy loam and Craigieburn silt loam. MCP was applied at 75 and 150µg g−1 soil; NCPR was applied at 150 and 750µg g−1 soil; and NCPAPR was applied at 150µg g−1 soil. After 1, 50 and 111 days of incubation, the treated soil samples were labelled with carrier-free32P-phosphate ions, and perennial ryegrass (Lolium perenne) was grown to sample specific activity in these samples. Results showed that the changing patterns of exchangeable P in the soils as affected by fertilizer solubility and application rate could be clearly explained by the values of Fin and Fout. With increasing period of soil-fertilizer contact, the P added in the form of MCP solution was rapidly transformed into non-exchangeable forms (high Fout value). Exchangeable P in the NCPR and NCPAPR treated soils were maintained at steady concentrations for extended periods due to the continued release of P from the fertilizer material (steady Fin) and lower rates of P retention by the soil (smaller Fout). The dissolution rate of NCPR at the lower application rate was smaller in absolute terms, but greater in relative terms. More... »

PAGES

1-9

Journal

TITLE

Fertilizer Research

ISSUE

1

VOLUME

38

Author Affiliations

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00750057

DOI

http://dx.doi.org/10.1007/bf00750057

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1047620157


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