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Water Sci Technol. 2006;53(2):119-30.

Study on the potential of farmland soils as non-point sources of nitrogen and phosphorus in Japan.

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Department of Civil and Environmental Engineering, Faculty of Engineering, Yamaguchi University, Tokiwadai, Ube 755-8611, Japan.


The amounts of N and P accumulated in farmland soils of 50 cm depth were equivalent to the amount of chemical fertilizer supplied for 50-70 years. The values of N/P of surface soils in farmlands were 1.0-4.3, lower than expected. The median diameter of soil particles in run-off waters was generally less than 10 microm. The mean values of particulate fractions over 1 microm and over 0.22 microm were 19% for N, 27% for P, and 39% for N, 64% for P respectively. Fine particles of soil containing concentrated phosphorus should be carefully monitored as potential sources related to eutrophication.

[Indexed for MEDLINE]

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