Effect of irrigation quota on soil nitrate nitrogen concentration under surge irrigation

To study the effects of irrigation quota on nitrate nitrogen transport in the groundwater, based on indoor experiments of fertile solution infiltration, the effects of irrigation quota on the influence of groundwater quality under the condition of 150 cm groundwater level depth were studied. The results showed that the nitrate nitrogen concentration in the underwater under different irrigation quota treatments had similar tendency, nitrate nitrogen concentration increased with decreasing of groundwater depth, that was to say shallow groundwater was vulnerable polluted by nitrate nitrogen; the maximum concentration of the nitrate nitrogen in the groundwater was appeared at the end of irrigation; the nitrate nitrogen concentration in groundwater increased with the time lengthening under the same irrigation quota; the nitrate nitrogen concentration increment in groundwater increased with increasing of irrigation quota. The more the irrigation quota is, the more seriously the nitrate nitrogen pollutes.