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In recent decades, acid rain has caused great harms to human health and the environment, including soil. In this paper, based on secondary data and materials, analyses of soil physio-chemial properties, in combination with field study, the study assessed effects of acid rain on some characteristics of soybean soil in Yen Thuy District, Hoa Binh Province. The experiments were carried out at pH of 3.0; 3,5; 4.0; 4,5; 5,0; 5.5, with a control sample. The results showed that all physio-chemical parameters of the soil were strongly correlated with the pH of acid rain. The values of pHKCl, pHH2O, available -N, -P and -K, OM, CEC, Ca2 + and Mg2+ in the soil were lower than those of the control sample and tended to decrease when pH of acid rain reduced. In contrast, contents of Al3+, Fe3+, Mn2+, SO42- in the experimental soil were higher than those of the control sample and tended to increase when pH of acid rain was low.
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