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The increasing demand of rice crops leads to elevated levels of nitrogen in water bodies in Asia. The concentrations of organic and inorganic nitrogen and the nitrogen isotope ratio in nitrate (NO 3 -) were analysed to identify the sources of nitrogen in the outflow waters from a paddy field in Japan in 2013. Nitrogen concentrations in the drainage and percolation waters were the highest during the paddling period, NO 3 was the dominant form of dissolved total nitrogen and the δ 15 N-NO 3doi:10.2965/jwet.2015.371 fatcat:rhmciydcqvaqjnmhe3csha3kay