1Dept. of Environmental Engineering, Aalborg University, Sohngaardsholmsvej 57, DK-9000 Aalborg, Denmark.
2Graduate School of Science and Engineering, Saitama University, Saitama, 338–8570 Japan.
3Dept. of Hilly Land Agriculture, National Agricultural Research Center for Western Region, Kagawa, 765–0053 Japan.
4Dept. of Crop Physiology and Soil Science, Danish Institute of Agricultural Sciences, Research Centre Foulum, DK-8830 Tjele, Denmark.
5Soils and Biogeochemistry, Dept. of Land, Air and Water Resources, University of California, Davis, CA 95616.
Dr. Moldrup is corresponding author. E-mail: [email protected]
Received Oct. 16, 2002; accepted Feb. 14, 2003.