Nitrogen fertilization and nitrate pollution in groundwater in Japan: Present status and measures for sustainable agriculture

  title={Nitrogen fertilization and nitrate pollution in groundwater in Japan: Present status and measures for sustainable agriculture},
  author={Kikuo Kumazawa},
  journal={Nutrient Cycling in Agroecosystems},
  • K. Kumazawa
  • Published 1 July 2002
  • Environmental Science
  • Nutrient Cycling in Agroecosystems
During the last two decades, nitrate nitrogen (NO3-N) concentrations in groundwater in Japan have increased steadily due to the development of intensive agriculture. In some areas, they have reached or even exceeded the unacceptable level for drinking water, 10 mg l−1. In 2000, the Environment Agency showed that 5.6% (173 of 3,374) tested wells and 4.7% (64 of 1,362) wells used for drinking water exceeded the standard level in 1999. The highest value of NO3-N in the wells was 100 mg l−1. Many… 

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