设 施 韭 菜 氮 肥 投 入 与 土 壤 氮 素 状 况 研 究摘 要韭菜是人们餐桌上经常食用的蔬菜之一，在整个生长周期中，最适温度约在18~25℃ ，食用部分形成期喜爱弱光，喜湿耐涝，因此，在如今，设施栽培逐渐的应用到到韭菜种植业来。保持土壤肥力的重要组成部分就是氮素，蛋白质的主要构成元素是氮，同时细胞原生质基本物质是蛋白质。氮肥用量过高或过低都会影响韭菜的产量和品质，因此本项目选择典型的设施韭菜生产农户，调查设施韭菜土壤氮肥投入状况和韭菜产量，并到田间实地调查采集土壤样品。基于肥料投入调查和产量调查数据及土壤碱解氮分析结果，综合分析设施韭菜土壤氮素投入特征与土壤碱解氮含量状况，以期为韭菜生产中科学施用氮肥提供科学依据。 由本次试验测得的数据，基本可推知本次土壤样品大多存在氮肥的施入量过多导致土壤过度酸化影响韭菜作物产量的现象。关键词 氮肥；韭菜；土壤氮素含量II中国农业大学学士学位论文 Abstract AbstractLeek is one of the vegetables that people often eat at the table. In the whole growth cycle, the optimum temperature is about 18-25 ℃. During the formation period of the edible part, it likes weak light, wet and waterlogging tolerance. Therefore, nowadays, facility cultivation has been more and more applied to the cultivation of leek. Nitrogen is an important component of soil fertility.Nitrogen is the main element of protein, and protein is the basic substance of cell protoplasm.Excessive or low nitrogen fertilizer use will affect the yield and quality of leek.Therefore, this project chooses typical facilities leek farmers to conduct field research ,to investigate the status of nitrogen fertilizer input and leek yield in facilities leek soil, and to collect soil samples in the field. Based on the data of fertilizer input and yield survey and the results of soil alkali-hydrolyzed nitrogen analysis, the characteristics of soil nitrogen input and the content of soil alkali-hydrolyzed nitrogen in leek were co...
