Studies On Nitrogen Use Efficiency Of Cucumber Resources And Examination Of Low Nitrogen Tolerance

Nitrogen is one of three fertilizers, but a great deal use of nitrogenous fertilizer has made environmental pollution, as soon as made the descend of nitrogen efficiency of corps and enhance the cost. One of the important reasons of the irrational use of nitrogenous fertilizers is which make higher content of nitrate than health standard. The lack of nitrogenous fertilizer make the descend of yield and quality of vegetable. To solve the problem, it is necessary to study nitrogen efficiency, in order to provide precise and convenient indexes and methods which is very significant work currently. The selection of cucumber which are common for people. Hope it is good for vegetable planted.The experimentation were taken by potted planted to study the difference of nitrogen use efficiency in different cucumber varies. In order to confirm the identifiable of nitrogen use efficiency and identify valuable breeding and planting material to green food, studied the nitrite and nitrate content of cucumber, and the mechanism of nitrite and nitrate accumulation.There is distinct difference of nitrogen use efficiency among the different varies of cucumber in low nitrogen. The supply varies are classed 3 types by nitrogen accumulation, biology dry weight and yield, found the nitrogen use efficiency are higher which two varies of huabei type, two varies of European fresh type and one varies of huanan type.. The nitrogen use efficiency is significantly related to the exponent of malnutrition stress.The experimentation mainly studied the characters of cucumber's relation to the nitrogen use efficiency in low nitrogen, find yield, plant height, leaf area, root volume, root dry weight, the ratio of root and plant six characters is significantly related nitrogen use efficiency. They can be the examination of malnutrition stress.The experimentation studied the nitrite and nitrate content of varies, there is distinct difference among the different varies. Except one varies' nitrite content is high, others are lower than healthy standard, the varies D0327 is best for eating.To analyse correlativity of NR activity and nitrite and nitrate content, the related of them is not significant.