Affiliation: | Department of Environmental Chemistry, Heavy Metal Group, Soil Biochemistry Unit, National Institute for Agro-Environmental Sciences, Ibaraki 305-8604,;Department of Biological and Environmental Sciences, Faculty of Agriculture, Kobe University, Hyogo 657-8501 and;Laboratory of Plant Nutrition and Soil Science, Faculty of Agriculture, Yamagata University, Yamagata 997-8555, Japan |