Aquaculture Floc Waste Addition Facilitates Soil Fertility, Growth Performance of Crown Daisy (Glebionis Coronaria (L.) Cass. ex Spach) and Community Composition of Rhizobacteria

Intensive BFT (Biofloc Technology) system production leads to large amounts of FSW (Floc Solid Waste), but the disposal of this waste is rarely noticed. As one of the novel solid wastes of aquaculture, the FSW was treated through planting within various supplemental dosages to obtain a more comprehensive assessment on its reclamation potential in this experiment. FSW was added to the soil in the following proportions respectively: 0.5% (adding FSW/Soil weight ratio percentage W/W (dry matter/dry matter)), 1%, and 2%. Pure soil was selected as the control and the pot experiment was conducted based on Crown daisy (Glebionis coronaria (L.) Cass. ex Spach) for 40 days. FSW addition considerably increased soil fertility which exhibited the positive correlation except for the soil pH. Adding ratio with 0.5%, and 1.0% provided the best plant growth with the yield of 50.2 g/m², and 41.5 g/m² respectively. 2.0% FSW addition inhibited the growth of plants, while certain amount of FSW addition not greatly promoted the quantities of plants. FSW addition obviously altered the original soil rhizobacteria communities and increased abundance of some beneficial bacteria, especially for Bacillus sp, Fictibacillus sp. Through RDA (Redundancy Analysis), the strongly positive relation between soil fertility and functional microorganisms in FSW added treatments has been verified. In conclusion, positive plant growth performance and the facilitation of soil fertilities demonstrated the potential of FSW as soil fertilization and amendments.