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- W2372893228 abstract "Through the testing-hole and rice-fields pa ra digm experiment,the rul e of runoff loss of fertilizing-N and controlling cou ntermeasures in rice fields in th e upstream area of HuangPu River wate rshed we re studied.The results were as follows:1)After the first and second fertiliz ation(NH 4 HCO 3 ),the concentration of total nitroge n in the surface water of rice fields decreased rapidly,being 25.13%～50.25%of the initial concentration 1～2days after fertilization and lower than 10%after 4days.2)In the th ird and forth fertilization(CO(NH) 2 ),the concentration of total nitrogen increased a little 1～3days after fe rtilization then decreased,which was different from the first an d second fe rtilization.3)The man-made-raining experiment sh owed that rainstorm afte r fer-tilization caused the great loss of nitrogen.The loss amount of total ni trogen was 5.54～7.95kg·hm-2 in the first fertilization when encountering 40mmrainstorm1day after fert ilization and that reached 16.74～24.02kg·hm-2 if the rainstormwas 80mm.NH 4+-N was the main form of the runoff loss.4)The drainage in seeding and ba king period should be controlled strictly t o prevent the loss of nitrogen.5) Increasing the usage of organic fertilizers and reducing the usage of chemical f ertilizers had no effect on rice yield,but that largely reduced the drainage a n d runoff loss of nitrogen and was an effective measure to protect the agric ul tural water environ-ment." @default.
- W2372893228 created "2016-06-24" @default.
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- W2372893228 date "2004-01-01" @default.
- W2372893228 modified "2023-09-25" @default.
- W2372893228 title "Rule of Lose of Nitrogen in the Surface Water of Rice Fields and the Control Technology" @default.
- W2372893228 hasPublicationYear "2004" @default.
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