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Differential Aluminum Tolerance of Two Wheat Varieties Associated with Plant-Induced pH Changes Around Their Roots¹

ABSTRACT

Differential Al tolerance of Atlas 66 and Monon wheat varieties in nutrient solutions and in acid Bladen soil was attributed, at least in part, to plant-induced differential pH changes around their roots.

In nutrient solutions the Al-sensitive Monon variety lowered the pH and the Al-tolerant Atlas variety raised the pH, resulting in differences as large as 0.7 pH unit in the nutrient media. In acid Bladen soil this difference was much smaller, and a high root-to-soil ratio was necessary to produce observed pH differences that were significant. The factor responsible for higher Al-tolerance of Atlas was not transferred to Monon in mixed cultures in Bladen soil. The evidence indicates that the layer of plant-altered soil surrounding the roots was extremely thin.

¹ Contribution from the U. S. Soils Laboratory and the U. S. Mineral Nutrition Laboratory, Soil and Water Conservation Research Division, ARS, USDA, Beltsville, Md.

² Soil Scientists.

³ Physical Science Technician.

Received for publication May 25, 1964. Accepted for publication July 7, 1964.