Residual phosphorus solubility for an acid, clayey, forested soil in the presence of oxalate and citrate

A highly weathered, clayey soil was sampled 14 yr after a Pinus radiata stand was broadcast fertilized with 0, 50 and 200 kg P ha −1 as ordinary superphosphate. Incremental loadings of oxalate and citrate anions from 10 to 100 μmol of anion g −1 soil were evaluated for increased soluble, reactive P...

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Bibliographic Details
Published in:Canadian journal of soil science 1989-02, Vol.69 (1), p.111-117
Main Authors: Comerford, N.B, Skinner, M.F
Format: Article
Language:English
Subjects:
acid soils
Agronomy. Soil science and plant productions
Biological and medical sciences
citrates
clay soils
forest soils
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
Nitrogen, phosphorus, potassium fertilizations
orthophosphates
oxalates
Phosphorus fertilization
phosphorus uptake
Pinus radiata
Soil-plant relationships. Soil fertility. Fertilization. Amendments
solubility
sorption isotherms
superphosphate
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Summary:A highly weathered, clayey soil was sampled 14 yr after a Pinus radiata stand was broadcast fertilized with 0, 50 and 200 kg P ha −1 as ordinary superphosphate. Incremental loadings of oxalate and citrate anions from 10 to 100 μmol of anion g −1 soil were evaluated for increased soluble, reactive P (SRP) and soluble, nonreactive (SNP) P. Sorption isotherms were compared to evaluate the effect of the previous fertilization on P sorption by the soil material sampled, and also to measure SNP displacement by orthophosphate-P. A portion of the SNP pool was more readily released than SRP and orthophosphate displaced a significant amount of SNP. After 14 yr the effect of fertilization was still obvious in the sampled soil material. Much of the organic anion-soluble P was in the SRP form. Key words: Citrate, organic P, orthophosphate, oxalate, Pinus radiata, residual P
ISSN:0008-4271
1918-1841
DOI:10.4141/cjss89-010