Details
| Original language | English |
|---|---|
| Pages (from-to) | 587-601 |
| Number of pages | 15 |
| Journal | Soil Science |
| Volume | 173 |
| Issue number | 9 |
| Publication status | Published - Sept 2008 |
Abstract
Effects of organic matter on phosphorus (P) sorption are not completely understood, among others, because the molecular composition of organic matter seldom has been considered. Our objective was to investigate how surface modification of a tropical soil with specific organic compounds altered the P sorption and distribution of the sorbed P. Samples of an ando-humic Nitisol, original and treated with H2O2 to remove native organic matter, were amended by 50 g C kg from lipids, lignin building blocks, glucose, albumin, tryptophan, histidine, and a mixture of these compounds. Phosphorus sorption was studied by equilibrating 1 g of the treated soil samples in 30 mL of 1 mM CaCl2 • 2H2O containing 0 to 645.71 μmol P L. The P concentrations in the soil solution after 24 h followed the order: histidine > mixture > lignin > albumin > lipid > tryptophan > glucose > control in the original sample and albumin > lignin > lipid > mixture > histidine > tryptophan > glucose > control in the H2O2-treated sample. Phosphorus sorption was lower in the H2O2-treated than in the original sample, which was explained by removal of aluminum and an increase in negative surface charges after native soil organic matter oxidation. The sorbed P distribution, studied by sequentially fractionating the samples with the highest P load, showed that 73 to 96% (original) and 100% (H2O2 treated) of sorbed inorganic P was extracted by the first three fractions (anion exchange membrane-Pi, NaHCO3-Pi, NaOH-Pi). From calculations of P requirements for sufficient P concentrations for plant growth, it was concluded that surface modification by the addition of locally available organic compounds with great molecular complexity and organic P constituents may help to reduce the need for mineral P fertilizer and increase its efficiency in tropical soils.
Keywords
- Hedley fractionation, Organic matter, Phosphate availability, Sorption isotherms
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Soil Science
Sustainable Development Goals
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In: Soil Science, Vol. 173, No. 9, 09.2008, p. 587-601.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Influence of specific organic compounds on phosphorus sorption and distribution in a tropical soil
AU - Negassa, Wakene
AU - Dultz, Stefan
AU - Schlichting, André
AU - Leinweber, Peter
N1 - Copyright: Copyright 2009 Elsevier B.V., All rights reserved.
PY - 2008/9
Y1 - 2008/9
N2 - Effects of organic matter on phosphorus (P) sorption are not completely understood, among others, because the molecular composition of organic matter seldom has been considered. Our objective was to investigate how surface modification of a tropical soil with specific organic compounds altered the P sorption and distribution of the sorbed P. Samples of an ando-humic Nitisol, original and treated with H2O2 to remove native organic matter, were amended by 50 g C kg from lipids, lignin building blocks, glucose, albumin, tryptophan, histidine, and a mixture of these compounds. Phosphorus sorption was studied by equilibrating 1 g of the treated soil samples in 30 mL of 1 mM CaCl2 • 2H2O containing 0 to 645.71 μmol P L. The P concentrations in the soil solution after 24 h followed the order: histidine > mixture > lignin > albumin > lipid > tryptophan > glucose > control in the original sample and albumin > lignin > lipid > mixture > histidine > tryptophan > glucose > control in the H2O2-treated sample. Phosphorus sorption was lower in the H2O2-treated than in the original sample, which was explained by removal of aluminum and an increase in negative surface charges after native soil organic matter oxidation. The sorbed P distribution, studied by sequentially fractionating the samples with the highest P load, showed that 73 to 96% (original) and 100% (H2O2 treated) of sorbed inorganic P was extracted by the first three fractions (anion exchange membrane-Pi, NaHCO3-Pi, NaOH-Pi). From calculations of P requirements for sufficient P concentrations for plant growth, it was concluded that surface modification by the addition of locally available organic compounds with great molecular complexity and organic P constituents may help to reduce the need for mineral P fertilizer and increase its efficiency in tropical soils.
AB - Effects of organic matter on phosphorus (P) sorption are not completely understood, among others, because the molecular composition of organic matter seldom has been considered. Our objective was to investigate how surface modification of a tropical soil with specific organic compounds altered the P sorption and distribution of the sorbed P. Samples of an ando-humic Nitisol, original and treated with H2O2 to remove native organic matter, were amended by 50 g C kg from lipids, lignin building blocks, glucose, albumin, tryptophan, histidine, and a mixture of these compounds. Phosphorus sorption was studied by equilibrating 1 g of the treated soil samples in 30 mL of 1 mM CaCl2 • 2H2O containing 0 to 645.71 μmol P L. The P concentrations in the soil solution after 24 h followed the order: histidine > mixture > lignin > albumin > lipid > tryptophan > glucose > control in the original sample and albumin > lignin > lipid > mixture > histidine > tryptophan > glucose > control in the H2O2-treated sample. Phosphorus sorption was lower in the H2O2-treated than in the original sample, which was explained by removal of aluminum and an increase in negative surface charges after native soil organic matter oxidation. The sorbed P distribution, studied by sequentially fractionating the samples with the highest P load, showed that 73 to 96% (original) and 100% (H2O2 treated) of sorbed inorganic P was extracted by the first three fractions (anion exchange membrane-Pi, NaHCO3-Pi, NaOH-Pi). From calculations of P requirements for sufficient P concentrations for plant growth, it was concluded that surface modification by the addition of locally available organic compounds with great molecular complexity and organic P constituents may help to reduce the need for mineral P fertilizer and increase its efficiency in tropical soils.
KW - Hedley fractionation
KW - Organic matter
KW - Phosphate availability
KW - Sorption isotherms
UR - http://www.scopus.com/inward/record.url?scp=67049156246&partnerID=8YFLogxK
U2 - 10.1097/SS.0b013e3181847eef
DO - 10.1097/SS.0b013e3181847eef
M3 - Article
AN - SCOPUS:67049156246
VL - 173
SP - 587
EP - 601
JO - Soil Science
JF - Soil Science
SN - 0038-075X
IS - 9
ER -