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Boron Sorption by Soil in the Presence of Composted Organic Matter

Inst. of Soil and Water, Agriculture Research Organization, The Volcani Center, Bet Dagan, Israel

Y. Chen

The Seagram Center for Soil and Water Sciences, Faculty of Agriculture, P.O. Box 12, The Hebrew Univ. of Jerusalem, Rehovot 76100, Israel

* Corresponding author ( vwrmen{at}volcani.agri.gov.il).

ABSTRACT

Although the organic matter content in cultivated soil is relatively low, its presence may have a significant effect on B distribution between the solid and liquid phases in soils. This study was conducted to determine the influence of organic matter in soil on B sorption and to test a B sorption model for soil in the presence of organic matter. The study was conducted on a loess soil (Calcic Haploxeralf). Mature compost, produced from the solid fraction of separated straw-containing cattle manure, served as a simulation of organic matter. Boron sorption by soil-composted organic matter mixtures increased as the organic matter content increased. At low pH levels (below pH 8), the sorption isotherms were linear regardless of the composted organic matter content. At the higher pH range, however, a deviation from linearity was observed. This deviation, which increased with pH, was related to the surface concentration of occupied sorption sites. Sorption B data from batch experiments were compared with results computed according to fitted adsorption coefficients (maximum B sorption and affinity coefficients that related to the binding energy). The B sorption capacity of the mixture increased with the composted organic matter content. The agreement between calculated values and experimental results indicates that the sorption model can be used to predict B sorption by soil-organic matter mixtures.

Contribution from the Inst. of Soil and Water, Agriculture Research Organization, The Volcani Center, Bet Dagan, no. 1987 Series, and from the Faculty of Agriculture, The Hebrew Univ. of Jerusalem, Rehovot.

Received for publication January 3, 1994.

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