Effects Of Concentration Of FA In Fresh- And Brackish-Water Nutrient Solution On Three Kinds Of Protected Vegetable

In this study,three kinds of vegetables,tomato,rapeseed and spinach,which were cultivated in greenhouse in the north of China,were chosen as experimental plant.Under the same supply level of nutrients,6,5 and 5 fulvic acid?FA?concentration treatments in fresh-water and brackish-water nutrient solution,respectively,were set up,so as to study the effects of different treatments on the growth and development,physiological changes,quality and yield of vegetables at different growth periods.On this basis,the TOPSIS model based on AHP and entropy weight method was used to evaluate vegetables,and the suitable concentration of FA was determined under different irrigation conditions.The main findings are as follows:Under both fresh and brackish water nutrient solution irrigation,the growth,development,yield,quality of tomato plant were promated by 150 mg·L^-1 of FA concentration,the composite score was the most,was 0.852 and 0.918,respectively.It was the most optimal concentration of FA for tomato under experimental condition.When irrigated with fresh water nutrient solution,the optimal concentration of FA for rapeseed was 240 mg·L^-1.The yield of rapeseed per plant was 120.13 g,and the composite score was the most.Under brackish water nutrient solution irrigation,the composite score was the most?0.963?,when the concentration of FA was 320 mg·L^-1,It was the most optimal concentration of FA for rapeseed under experimental conditions.Under both fresh and brackish water nutrient solution irrigation,the growth,yield and quality of spinach were increase when the concentration of fulvic acid was 240 mg L^-1,It was the most optimal concentration of FA for sponach under experimental conditions.