... wastewater inflow was measured with an integration flow meter. The effluent water volume was calculated as the sum of inflow and rainfall minus evapotranspiration. Because the paddy field had ... 5965, Koibuchimachi, Mito 319–0323, Japan *** National Agricultural Research Center, 3-1-1, Kannondai, Tsukuba 305-8666, Japan ABSTRACT In Japan, environmental quality standards for Zn pollution ... micronutrient for mammals, and many foods contain it. Some commodities such as shampoos and cosmetics also contain Zn. Nakanishi et al. (2008) estimated that, in Japan, 468 t/year of Zn is loaded from...