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在滇池北岸韭黄生产基地采用田间试验的方法,研究了氮肥减施及双氰胺(DCD)施用对土壤氮素流失的影响。结果表明:减施20%的氮肥,韭黄产量无明显减少,但可以分别减少淋溶、侧渗、径流水氮损失37.0%,22.2%和28.9%左右,减少韭黄硝酸盐含量13.6%左右。减施20%氮肥后配施双氰胺,可以增加韭黄产量8.7%左右,分别减少淋溶、侧渗、径流水氮损失58.4%,59.7%和17.1%左右,减少韭黄硝酸盐含量24.8%。因此,该技术对减少滇池北岸韭黄地氮素流失和降低韭黄硝酸盐含量具有重要实践意义和推广价值。
In the northern chuandan production base in Dianchi Lake, a field experiment was conducted to study the effects of nitrogen fertilizer application and DCD application on soil nitrogen loss. The results showed that the yield of Chinese chive and chives reduced by 37.0%, 22.2% and 28.9% respectively, and the nitrate content of chives reduced by about 13.6%. The application of dicyandiamide after 20% nitrogen fertilization can increase the yield of chives by 8.7%, and reduce the leaching, infiltration and runoff water losses by 58.4%, 59.7% and 17.1%, respectively, and reduce the nitrate content by 24.8%. Therefore, this technology has important practical significance and popularization value to reduce the nitrogen loss and reduce the nitrate content of chive yellow in Dianchi Lake.