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Title:: Benefit Assessment of Reducing Nitrogen Application in Greenhouse Tomato in Salinized Fluvo-aquic Soil Area Based on Fuzzy Comprehensive Evaluation

Author(s):: LIU Quanfeng1; WANG Yixuan2; QI Lixue2; CAO Jinfeng1; SUN Qiang3; LAI Deqiang1; (1.Cangzhou Academy of Agriculture and Forestry Sciences,Cangzhou Vocational College of Technology,Cangzhou,Hebei 061001;2.Environmental Protection and Soil and Fertilizer Stations,Agriculture and Animal Husbandry Bureau of Cangzhou Municipality,Cangzhou,Hebei 061001;3.Hejian City Bureau of Agriculture,Cangzhou,Hebei 062450)

Keywords:: salinized alluvial soil; greenhouse tomato; amount of nitrogen fertilizer; benefit evaluation

Abstract:: The fuzzy comprehensive evaluation method was applied in this study by taking tomato as research object.The multi-factor secondary evaluation index system was established,which included 7 indexes from 3 aspects of society,economy and ecological environment to evaluate the social,economic and ecological benefits of different nitrogen dosages on tomato(no nitrogen(N0),nitrogen application 150 kg·hm-2(N1),nitrogen application 300 kg·hm-2(N2),nitrogen application 450 kg·hm-2(N3),and farmers′ habit of nitrogen application 600 kg·hm-2(N4)) in order to find out the optimum amount of nitrogen fertilizer in greenhouse planting in Cangzhou.The results showed that when only the social benefits was considered,very well results could be achieved under N0,N1 and N3,respectively.When only economic benefits was considered,the highest evaluation value was measured in the case of N2.When only the benefit of ecological environment was considered,N0 had the minimum effect on the ecological environment.When the social,economic and ecological environment benefits was considered as a whole,the highest comprehensive benefit was observed in the case of N3 and the lowest of that was observed in the case of N4.It had important guiding significance for evaluating the social,economic and ecological benefits of nitrogen fertilizer application in salinized fluvo-aquic soils.