Jilin Corn Belt Typical Regions Groundwater Nitrate-nitrogen Pollution Condition Diagnosis

The nitrogen is one of important life elements, the nitrogen took in the agriculture ecosystem the most important nutritive elements, are in the agricultural production the essential nutrients. Therefore the increase N fertilizer executes the amount used is enhances the crop yield the important measure. Because in the agricultural production the N fertilizer executes the amount used sharp increase, the N fertilizer use factor is low, the N fertilizer excessive employment has created the serious environment problem, Like the water body eutrophication, the tap water nitrate excessive accumulation endangers the human body health and soil N₂O directly discharges environment question and so on enhancement atmosphere greenhouse effect causes the people to the environment attention. In the agriculture ecosystem, the input soil N fertilizer has three kind of whereabouts, namely a part by the crops absorption, a part remains in the soil by inorganic or the organic shape, another part of N loss ascent environment. The majority of investments nitrogenous fertilizer only then little partially works as the season crops absorption, other majorities through ammonia way and so on volatility, nitration counter nitration as well as drip washing and runoff lose, in the ordinary circumstances by drip washing nitrogen main NO₃^--N, the NO₃^--N leaching not only is the important way which the nitrogen loses, also causes the ground water nitrate pollution primary factor. The Jilin com belt typical area nitrogenous fertilizer excessive and not reasonably employs quite universally, but said on the nitrogenous fertilizer to the ground water negative influence, this region also lacks the integrated system the research, therefore this article selected the Jilin com to bring two typical planters regions the underground well water sample to take the research object, studied in the long-term com continuous cropping, the farmer convention applies fertilizer under the condition, the com belt ground water nitrate pollution condition, produced reason and influence factor and so on, its main findings as follows:Below through brings two typical regions 20 water wells to the Jilin com the dynamic monitors to obtain the result:The Jilin com has two typical regions ground water NO₃^--N content amplitude is 0.02-160.68 mg/L,The mean value is 14.83mg/L,Has 25.6% is investigated in the well water the NO₃-N content to receive the influence which the humanity moves (NO₃^--N >= 2mg/L) in,26.9% well water the NO₃-Ncontent surpasses the international security permission upper limit (NO₃^--N>=10mg/L) in, 16.9%...