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Soil Factors Affecting the Adsorption of 2,4,5-T¹

ABSTRACT

Factors expected to affect the adsorption of 2,4,5-T (2,4,5-trichlorophenoxyacetic acid) on four soils of the western USA were studied. The effects were examined by equilibrating solutions of 2,4,5-T with soils in their natural condition, after Casaturation, and with samples of the same soils treated to remove soil constituents expected to affect adsorption. Organic matter was an important contributor to 2,4,5-T adsorption, and, in some soils, was the only adsorbent of significance. Oxides of Fe and Al did not contribute much to adsorption in the soils studied although the pH of soils studied was only slightly acid to alkaline. Allophane was apparently an effective adsorbent when the Si/Al ratio of the allophane was high.

¹ Journal article no. 494, Agr. Exp. Sta., New Mexico State Univ., Las Cruces, New Mexico 88003.

² Assistant Professor of Agronomy and Professor of Agronomy, respectively, New Mexico State Univ., Las Cruces, New Mexico 88003.

Received for publication November 6, 1973. Accepted for publication February 6, 1974.