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Differential Aluminum Tolerance of Two Wheat Varieties Associated with Plant‐Induced pH Changes Around Their Roots
Author(s) -
Foy C. D.,
Burns G. R.,
Brown J. C.,
Fleming A. L.
Publication year - 1965
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1965.03615995002900010019x
Subject(s) - nutrient , agronomy , plant root , soil ph , soil nutrients , plant growth , chemistry , significant difference , horticulture , biology , soil water , mathematics , statistics , organic chemistry , ecology
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.