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Soil-plant relationship studies on arsenic. 1. Correlation between the forms of arsenates in soil and rice plant response



Soil-plant relationship studies on arsenic. 1. Correlation between the forms of arsenates in soil and rice plant response



Journal of the Science of Soil and Manure, Japan 47(3): 85-92



The phytotoxicity of As differed markedly depending on the forms added to soils. Na-As, and Ca-As forms were more toxic than Fe-As, or Al-As forms. Calculating the factor of toxicity in terms of GR50 (50% growth reduction in weight of 4-week-old rice plant), Al-As was 1/4 and Fe-As was 1/6 as toxic as Na-As or Ca-As in mineral soil, whereas in a volcanic ash soil the corresponding values were 1/6, and 1/10 respectively.

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