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Boron Adsorption and Release by Soils¹

ABSTRACT

The Langmuir adsorption equation was found to describe the adsorption of boron from solution by three soils up to a limited concentration. Agreement for a fourth soil was not as good. Wetting and drying of the soil following the addition of B waters increased the maximum adsorption capacity and bonding energy of the soil for B.

Leaching and successive extraction experiments indicated a relationship between the bonding energy of the soils for B and their release characteristics. Boron removal from three soils indicated a desorption type of release, whereas release by a fourth soil appears similar to the formation of a saturated solution of a chemical compound. These findings indicate that the difference in the release patterns may be expected to affect the absorption of B by plants and the removal of B from the soil.

¹ Contribution from the University of California, Davis. Presented before Div. IV, Soil Science Society of America, Nov. 16, 1959, at Cincinnati, Ohio.

² Assistant Irrigationist, Department of Irrigation and Extension Soil and Water Specialist, University of California, Davis. The authors are indebted to R. K. Jackson for his assistance in the laboratory work.

Received for publication August 14, 1959. Accepted for publication October 30, 1959.