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Physiological Activity of Hydrogen and Aluminum Clays and Resins¹

ABSTRACT

Suspensions of H-clay and Al-H-clay severely depleted excised barley roots of K, Mg, and Ca. Clays with exchangeable H ions were much more harmful than clays with exchangeable aluminum ions. The clear filtrates of these clay suspensions were no more effective than distilled water. Soybeans growing in columns of Al-Ca resin had severely stunted side roots whereas plants in the adjacent sand columns that received the effluent from the resin exhibited a proliferating root system.

¹ Contribution from the Department of Soils & Plant Nutrition, University of California, Berkeley. This work was supported in part by AEC Contract AT-(11-1)-34, Project no. 55.

² Former Research Assistant, presently at Instituto de Investigaciones Agropecuarias, Santiago, Chile, and Professor Emeritus, respectively.

Received for publication November 6, 1967. Accepted for publication March 8, 1968.