The Effects Of Different Fertilization Modes On The Loss Of Nitrogen And Phosphorus In Leakage Water, The Yield And Quality Of Cucumber, And Optimal Fertilization Judgment

Based on the problems caused by the irrational fertilization, the effects of6modes of fertilizer application(CK, CF, SF, OF, SF1, SF2) on the yield and quality of cucumber, and the loss of nitrogen and phosphorus in leakage water under each treatmentwere studied. In addition, in order to get the best social, economic and ecological benefits, the fuzzy comprehensive evaluation method was used to find the optimal fertilization.The results obtained are as follows:(1)Fertilizer application can significantly increase theconcentration of nitrogen and phosphorus in the leakage waters;Among the6kinds of different fertilization, the CF treatment contributed the highest concentration of nitrogen and phosphorus loss in seepage water, it reached8.908mg/1,0.066mg/1,1.009mg/1,10.718mg/1,1.875mg/l, respectively;While compared to the fertilizer reduction experiment, the more fertilizerapplied, the higher the concentration of nitrogen and phosphorus loss was found; Nitrogen loss was mainly on the form of nitrate, the proportion of nitrate to TN was up to55.76%-83.11%.(2) The descending order of both the VC content and the soluble sugar content of cucumber for6kinds of fertilization were:OF>SF>SF1>SF2>CF>CK, and fertilizer application can significantly increase the VC content and the soluble sugar content of cucumber, while the most effective pattern to improve the quality of cucumber was organic fertilizer; However, the descending order of nitrate content were as follows:CF>SF>OF>SF1>SF2>CK, the nitrate contentof the cucumber reached439.48mg/kg while the conventional fertilizer applied,reached moderate pollution; The nitrate content of cucunmber with SF, SF1and SF2were370.41mg/1,336.18mg/l,309.99mg/l, respectively, and reduced fertilizer application can decrease the nitrate content in the cucumber.(3) Compared with CK treatment, the other5modes of fertilizer application could raise the yield of cucumber significantly, the increasing rate could reach to18.81%-37.65%;The SF1and SF2could reduce the production of cucumber while compared to SF, and the yield reduction rate was1.14%and13.69%, respectively. (4) The fuzzy comprehensive evaluation showed that the best mode of the fertilization was SF1, followed were SF, OF, CK, SF2, and the worst mode was CF. Therefore, the promotions should be made to practice the SF1mode of fertilization in the region in order to obtain bettersocial, economic and environmental benefits to local farmers.