Organic Acids and Diffusive Flux of Organic and Inorganic Phosphorus in Sandy-Loam and Clayey Latosols

This study evaluated the effects of organic acids on the diffusive flux of phosphorus (DFP) along time. Treatments were a factorial 2 × 2 × 2 × 2 × 5 design: two soils (clayey Red Latosol and a sandy-loam Red-Yellow Latosol), two organic acids (citric acid, CA, and humic acid, HA), and two phosphoru...

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Bibliographic Details
Published in:Communications in Soil Science and Plant Analysis 2013-04, Vol.44 (7), p.1211-1223
Main Authors: Andrade, F. V, Mendonça, E. S, Silva, I. R
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
anion exchange
Biological and medical sciences
Citric acid
diffusion
Fundamental and applied biological sciences. Psychology
heat treatment
humic acid
humic acids
inorganic phosphorus
myo-inositol
phosphorus
phytic acid
soil
Soil science
transport
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Summary:This study evaluated the effects of organic acids on the diffusive flux of phosphorus (DFP) along time. Treatments were a factorial 2 × 2 × 2 × 2 × 5 design: two soils (clayey Red Latosol and a sandy-loam Red-Yellow Latosol), two organic acids (citric acid, CA, and humic acid, HA), and two phosphorus (P) sources [monopotassium phosphate (KH₂PO₄) and inositol hexaphosphate (IHP)] either with or without heating (100 °C) of the soil. The soil plus treatments, in all combinations, were placed in contact with an anion exchange resin and the P in the resin was measured after 2, 4, 6, 10, and 15 days. The DFP was greater when the soils were treated with CA than when treated with HA. Citric acid was more effective in increasing the DFP from KH₂PO₄, whereas HA was the organic ligand that promoted a larger DFP when the source was IHP.
ISSN:1532-2416
0010-3624
1532-2416
1532-4133
DOI:10.1080/00103624.2012.756001