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Toxic Factors in Acid Soils: II. Differential Aluminum Tolerance of Plant Species¹

ABSTRACT

Differential Al tolerance of plant species in nutrient solution and in acid Bladen soil was closely associated with the ability of plants to absorb and utilize P in the presence of excess Al.

Chelating agent (EDDHA), added to the nutrient solution portion of a split medium, increased the solubility of Al but decreased its toxicity to Al-sensitive plants. EDDHA at 1/4 the molarity of the Al added gave near-maximum yields for Al-tolerant buckwheat. For Al-sensitive barley, EDDHA at twice the molarity of the Al was required for normal growth. The beneficial effects of EDDHA on Al-sensitive barley in nutrient solution were associated with marked increases in the solubility of P and with increased uptake of P by plants.

¹ Contribution from the U. S. Soils Laboratory and the U. S. Mineral Nutrition Laboratory, Soil Water Conserv. Res. Div. ARS, USDA. Presented before Div. II, Soil Sci. Soc. Am., St. Louis, Mo. Nov. 29, 1961.

² Soil Scientists, Beltsville, Maryland.

Received for publication February 25, 1963. Accepted for publication September 27, 1963.