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Type: Journal article
Title: Aluminium speciation and phytotoxicity in alkaline soils
Author: Brautigan, D.
Rengasamy, P.
Chittleborough, D.
Citation: Plant and Soil, 2012; 360(1-2):187-196
Publisher: Kluwer Academic Publ
Issue Date: 2012
ISSN: 0032-079X
Statement of
D. J. Brautigan & P. Rengasamy & D. J. Chittleborough
Abstract: AIM Highly alkaline soils (pH > 9.0) may adversely affect agricultural crop productivity. Problems encountered include poor structure and nutrient deficiency. Research based on solution cultures suggests that aluminium (Al) phytotoxicity may occur in soils with pH > 9.0, but little research has been undertaken on actual soils under controlled conditions. The nature of the Al species responsible and the pH regime of the soils when this occurs are unknown. METHODS The charge and species of Al responsible for this toxicity was investigated using Zeta Potential measurement, Nuclear Magnetic Resonance (NMR) spectroscopy, Al precipitation characteristics and electrical conductivity as a function of pH. An anion exchange resin was used to evaluate Al availability to plants at alkaline pH. To verify Al phytotoxicity, a pot experiment was performed with plants grown at near neutral and high pH, with and without Al. RESULTS The anionic aluminate species of aluminium was ubiquitous at highly alkaline pH, and was the dominant charged species at pH 9.2. Aluminium was phytotoxic at high pH, significantly reducing the stem and root development of field pea test plants over and above that caused by alkalinity alone. The effects of both alkalinity in general and aluminium in particular became noticeable at pH 9.0 and debilitating at pH > 9.2. CONCLUSION As this corresponds to the pH where aluminate becomes dominant, it is probably responsible for the phytotoxicity.
Keywords: Aluminium; Phytotoxicity; Alkaline soils
Rights: © Springer Science+Business Media B.V. 2012
RMID: 0020122549
DOI: 10.1007/s11104-012-1232-5
Appears in Collections:Soil and Land Systems publications
Environment Institute publications

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