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| Nitrogen loss risk of paddy field under different fertilizations in runoff prone period |
| Received:May 12, 2017 |
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| KeyWord:paddy field;runoff;prone period;fertilizer type;nitrogen loss |
| Author Name | Affiliation | E-mail | | HOU Peng-fu | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | XUE Li-xiang | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | YU Ying-liang | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | JIANG Yu | Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | WANG Ji-dong | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | XUE Li-hong | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | njxuelihong@gmail.com | | YANG Lin-zhang | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | |
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| Abstract: |
| The runoff prone period of paddy field in Taihu Lake region was analyzed according to the typical natural rainfall data of 60 years in this study.Then,the actual runoff nitrogen control effect from paddy field in runoff prone period of different fertilization reduction treatment were compared using the runoff monitoring data in recent 3 years of a long-term fertilization reduction experiment that initiated in 2009.The results showed that,the rainfall probability was larger in early rice growth stage in Taihu Lake region and daily rainfall probability between June 21st and July 6th were more than 50%.The rainfall probability of basal fertilization stage and tillering fertilization stage were 48.15% and 49.81%,respectively,obviously higher than other stages.The mean precipitation of these two stages were 12.81 mm and 12.84 mm,both exceed the minimum rainfall for runoff (11.5 mm),implying high probability for paddy runoff in these two periods.The nitrogen in runoff water and surface water in the runoff prone period were mainly ammonium nitrogen as the long-term experiment study indicated.Compared with conventional nitrogen rate nitrogen rate (CN) treatment,the nitrogen concentrations of reduced nitrogen rate treatment (RF) and organic combined with chemical nitrogen treatment (OCN) were decreased 8.83% and 19.18%,respectively.The nitrogen concentrations in runoff water and surface water of sulfur coating urea treatment (SCU) in basal fertilization and basal fertilization-tillering fertilization stage were higher than those of other treatments,which increased 20.3% and 11.72% respectively incomparasion with CN treatment.The nitrogen concentration in runoff water of organic fertilizer treatment (OF) decreased 9.04% and 28.53% in basal fertilization and tillering fertilization stage,respectively,but increased 19.7% in tillering fertilization-panicle fertilization stage compared with CN treatment,which increased the risk of runoff nitrogen loss.The nitrogen reduction measures referred in this study can reduce the runoff water nitrogen concentrations in the runoff prone period of paddy field,but the effect on nitrogen loss control in the runoff prone period are different. |
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