Study on Nitrate Nitrogen Contamination of Groundwater by Farming and the Ponding water in Farmland

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In this research, it is carried out that the evaluation of the evaluation of effect to groundwater recharge by ponding water in farmland without no making rice, nitrogen loading by observation of the amount of nitrogen concentration of soil before and after ponding in farmland, and change of the amount of spring water and evaluation of change of the nitrate nitrogen concentration in spring water.As the results, I can get following results. In change of the amount of spring water from 2004 to 2013, the amount of spring water rose till 2008 and after that became almost fixed. This is based on the slow increase of the amount of groundwater recharge by ponding water in the farmland and the reduction of a paddy field. Since nitrate nitrogen concentration was low compared with the amount of recharge to underground, then it is understood that nitrate nitrogen contamination of groundwater by ponding is little influence.