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- W416397294 abstract "A field case study with independent irrigation system was conducted to elucidate the effect of nitrogen in surface water of paddy field as affected by different splitting application ratios of urea.The results showed that the total nitrogen mass(TN) in the surface water was closely correlated to the rates of urea applied and followed a trend of TN at the elongation stage that at the tillering stage that at the transplanting after urea was applied.TN reached its peak values 1 d after fertilizer application,reduced to less than 50 % 4 d later and continued to diminishing thereafter.The variation of ammonium nitrogen(NH4-N) contents during the rice growing period had a similar trend as TN but with a delayed peak value occurred 2 d after urea application.The change in concentration of nitrate nitrogen(NO3-N) was relatively flat,without any significant peaks observed.Its high values showed up at 3-4 d after fertilizer application and then gradually declined.Because the content of NO3-N was very small compared to NH4-N or TN in the surface water of the paddy field,the content of NH4-N or TN could be used as the main indexes for monitoring the water pollution from the paddy field,particularly within the first week after N application when water flooding from the field should be avoided as possible." @default.
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- W416397294 date "2008-01-01" @default.
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- W416397294 title "Study on the dynamics of nitrogen in surface water of paddy field as affected by different splitting application ratio of urea." @default.
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