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- W599271237 abstract "An investigation on water quality was conducted in a small catchment of a tea field for three years, and runoff loads of total nitrogen (T-N), total phosphorus (T-P) and chemical oxygen demand (COD) were estimated. Runoff quantity was estimated using a water-balance equation. The annual runoff loads of T-N were estimated to be 61.0 kg·ha-1 for the first year, 193 kg·ha-1 for the second year, and 88.1 kg·ha-1 for the third year, and the average load for the three years was 114.1 kg·ha-1. The ratio of the nitrogen load to the amount of applied nitrogen fertilizer was 17.1%, being much lower than in previous studies. The main reason for the low ratio obtained in this study was the lower concentration of nitrogen. The annual runoff loads of T-P and COD were estimated to be 0.68 kg·ha-1 and 59 kg·ha-1, respectively, and both were affected by the flushing effect on rainy days. This result suggests the importance of monitoring of phosphorus and COD as well as nitrogen in upland fields." @default.
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- W599271237 date "2002-01-01" @default.
- W599271237 modified "2023-09-25" @default.
- W599271237 title "Estimation of Runoff Pollutants of Nitrogen, Phosphorus and COD from a Small Catchment of Tea Field." @default.
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- W599271237 doi "https://doi.org/10.2965/jswe.25.565" @default.
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