氮肥施用量对夏玉米土壤NO_3^--N含量的影响

The Soil Nitrogen Pollution Research of Applying Nitrogenous Fertilizer on Summer-corn

采用定点监测方法,研究了不同氮肥施用量对夏玉米土壤NO-3-N含量的影响。结果表明:夏玉米增施氮肥,可导致土壤NO-3-N含量增加,且0~20 cm土层的NO3--N含量增加最明显;各土层的土壤NO-3-N含量基本随氮肥施用量的增加而升高,但随着土层深度的增加,NO3--N含量变化趋于平稳。河北平原夏玉米田正常施用氮肥,尚不会产生NO3--N对土壤和地下水污染。

In Malan farmland of Hebei province, the Nitrogenous soil pollution experiment of applying nitrogenous fertilizer in summer-corn was studied. The results shows： the NO3^--N content of 0 -20 cm soil increased remarkable along with N fertilizer increasing after applying N fertilizer, the highest content of NO3^--N was 39. 3 mg/kg when applying N 1 200 kg/hm^2. Applying N 150 - 300 kg/hm^2, the NO3^--N content of each depth 0 - 150 cm was under 20 mg/kg. Applying N 600 kg/ha and more, the NO3^--N content of 0 - 20 cm was 30 -40 mg/kg, but the NO3^--N content of deep soil was under 30 mg/kg. So, usual N fertilizer applying can＇t produce NO3^--N pollution to soil and groundwater in Hebei plain.