Interactive effects of soil acidity and fluoride on soil solution aluminium chemistry and barley (Hordeum vulgare L.) root growth

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Journal Article
Environmental Pollution, 2007, 145 (3), pp. 778 - 786
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A greenhouse study was conducted to determine if concentrations of fluoride (F), which would be added to acid soils via P fertilisers, were detrimental to barley root growth. Increasing rates of F addiction to soil significantly increased the soil solution concentration of aluminium (Al) and F irrespective of the initial adjusted soil pH, which ranged from 4.25 to 5.48. High rates of F addition severely restricted root growth; the effect was more pronounced inthe strongly acidic soil. Speciation calculations demonstrated that increasing rates of F additions substantially increased the concentrations of Al-F complexes inthe soil. Stepwise regression analsys showed that it was the combination of the activities of Alf1/2+ and Alfsuperscript 2+ complexes that primarily controlled barley root gorwth. the result suggested that continuous input of F to soils,and increased soil acidification, may become an F risk issue in the future.
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