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Influence of phosphate sorption on dispersion of a Ferralsol

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Title: Influence of phosphate sorption on dispersion of a Ferralsol
Authors: Pham, Dung Viet Browse this author
Ishiguro, Munehide Browse this author →KAKEN DB
Tran, Ha Thu Thi Browse this author
Sato, Tsutomu Browse this author →KAKEN DB
Keywords: Dispersion
repulsive potential energy
Issue Date: 2014
Publisher: Taylor & Francis
Journal Title: Soil Science and Plant Nutrition
Volume: 60
Issue: 3
Start Page: 356
End Page: 366
Publisher DOI: 10.1080/00380768.2014.902730
Abstract: Soil dispersion induces soil erosion and colloidal leaching. Nutrients are lost at the same time and this causes water contamination. Phosphate is an essential element for living organisms. Because phosphate influences soil dispersion and it is an important limited resource, this influence must be evaluated well in order to diminish negative effects on soil structure. In this paper, we firstly evaluated the influence of phosphate sorption on soil dispersion by calculating repulsive potential energy between soil particles. Ferralsol, which is a typical soil in rainy tropical regions, was used as the material. The dispersion-flocculation phenomena were investigated with absorbance of soil suspension under different pH, phosphate adsorption and electrolyte concentration in an Na-NO3-PO4 system. The repulsive potential energy was calculated based on the diffuse double layer theory and the measured zeta potential. We indicated that the measured absorbance increased with the increase of the repulsive potential energy. The repulsive potential energy increased with increasing phosphate sorption up to about 5 to 20 mmol kg−1 at all pH, and it induced the soil dispersion, because phosphate sorption increased the negative charge of the soil. After its peak, it decreased with increasing phosphate sorption because the electrolyte concentration increased and the electrolyte screened the electric field near the soil surface. The repulsive potential energy also increased with increasing pH because of the increase of the negative charge of the soil. Even at low pH, after a certain amount of phosphate sorption, the soil dispersed due to the increase of repulsive potential energy, although the soil flocculated before phosphate application. Because the soil dispersion causes soil and phosphorus loss, the influence of soil pH and phosphate sorption on the soil dispersion should be considered for good soil management.
Rights: This is an Accepted Manuscript of an article published by Taylor & Francis in Soil science and plant nutrition on 2014, available online:
Type: article (author version)
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 石黒 宗秀

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