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Reducing As accumulation and increasing yield of maize and mungbean were this study’s main goals. Two field experiments included 3 factors (plant, soil and irrigation water) with 14 treatments (experiment 1: 6 treatments and experiment 2: 8) and 4 replications. There were three different lime ratios (0, 5.0 and 10.0 tons CaO/ha), two soil types (the inside and outside dike soil) and two irrigation water types (deep well water and river water). The As accumulation of stems and seeds of maize were lower than that of stems and seeds of mungbean from 50.4 to 91.1% (stems) and 69.9 to 79.6% (seeds). Co-application of 5.0 tons CaO combined with NPK, river water irrigation and planted on the soil outside the dike were the highest As decrease and yield raising of maize and mungbean. The soil pH was strongly raised at the application of 10 tons CaO/ha which caused to lessen the production of maize and mungbean. Application of 5.0 tons CaO per ha combined with river water irrigation and planting on the outside dike soil would be introduced this technique to local farmers.
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