Purification Effect of Cultivating Green Leaf Vegetable on Floating-beds on Eutrophic Water Body

With Lactuca and Amaranthus as the planting stuff on floating-beds,the studies on their growth status and the purification effect on the eutrophic water indicated that Lactuca and Amaranthus could grow in the eutrophic water normally.The removal rate of TN,NH4+-N,NO3——N,TP and PO43——P respectively reached 69.83 %,85.41 %,59.57 %,76.58 % and 82.16 % by lactuca during 28 d growth and the removal rate of TN,NH4+-N,NO3——N,TP and PO43——P respectively reached 74.91 %,89.58 %,54.60 %,78.53 % and 84.71 % by amaranthus during 28 d growth.It was proved that lactuca and amaranthus had a significant effect on improving the quality of the eutrophic water,without producing nutrition enrichment,so lactuca and amaranthus were edible according to food standard.