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- W2023734029 abstract "Abstract To investigate the influence of chemical fertilizers on drinking water neighboring tea plantations in Kyushu, Japan, time series of chemical concentrations and nitrogen isotopic ratios within local ponds were studied. Results indicated that the main dissolved components of spring and river water originating from a tea plantation catchment were Ca 2+ , Mg 2+ , NO − 3 , and SO 2− 4 . Furthermore, pH values were below 7 due to plantation soil enrichment using nitrogen fertilizers and calcium and magnesium carbonates. Although acidic spring water flowed into a local pond, the pH value of the pond water remained mostly above 7. Occasionally, excessive spring water influx after heavy rains caused the pond water pH to dip below 7. The pond water showed temporal variations of pH ranging over 4 orders of magnitude within a 3–4 month period. The increase in pH values within the pond was associated with an increase in dissolved oxygen (DO) and δ 15 N values and the partial disappearance of NO − 3 . This is explained by nitrogen assimilation and production of oxygen during photosynthesis by algae." @default.
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- W2023734029 date "1997-12-01" @default.
- W2023734029 modified "2023-09-24" @default.
- W2023734029 title "Surface water chemistry, particularly concentrations of NO−3 and DO and δ15N values, near a tea plantation in Kyushu, Japan" @default.
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- W2023734029 doi "https://doi.org/10.1016/s0022-1694(97)00076-0" @default.
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