Influences of lime and irrigation water on arsenic accumulation of rice, maize and mungbean in the nethouse condition

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Chuong V. Nguyen, Nghiep X. Ho, Loan T.T. Le

Abstract

The essential goal of this study discovered effects of lime ratios, agricultural soils and irrigation water types on the arsenic (As) uptake of rice, maize and mungbean in the nethouse condition. Two nethouse experiments had three plant types of rice, maize and mungbean with two soils of inside and outside the dyke, two irrigated waters of 0.0 and 200 µg As/L and three different lime ratios (0, 7.0 and 9.0 tons CaO/ha). The whole treatments were twenty one (12 treatments of experiment 1  and 9 of experiment 2) and 4 repeats. Results of this study showed that the lime application raised both soi pH and crop yield . The As absorption of plant bodies in stems and seeds at inside the dyke was higher from 67.8 to 68.3% than those of outside the dyke, respectively. Arsenic contents of stems and seeds at treatments of 200 µg As/ L irrigation water were higher from 81.5 to 89.4 % than those of non As irrigation water, respectively. The lime supplementation of 7.0 and 9.0 tons CaO per ha reduced the As accumulation of stems and seeds of rice, maize and mungbean lower than without lime supplement from 38.6 (stems) and 54.5 (seeds). Mungbean absorbed the highest As, followed by rice and maize was the lowest As value. However, the lime supplementation of 9.0 tons CaO/ha had so high soil pH of soil that restricted the growth and  yield of crops. More lime ratios need to sudy for more new details and new discovery of positive effects of this study.

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