| 摘要 |
PROBLEM TO BE SOLVED: To accelerate the absorption of nutrient salt by striking a water current against the hairy root of a vegetable, to lure fish by the bubble from a diffuser and to develop an environment rich in zooplankton as a bait by providing the diffuser in the water under a vegetation floating island. SOLUTION: A diffuser consisting of a diffuser pipe 2 is provided in the water under a vegetation island 1 as an aerator. As a result, the aeration compressed air from an air feed pipe 3 is released into the water from the diffuser pipe 2, and the bubble ascends while giving oxygen to the surrounding water and joins the atmosphere. Meanwhile, the ascending bubble gives lifting energy to the water, and the water current ascending from the intermediate and deep layers strike against the floating island 1 to form slow diffused current in all directions. The diffused current rich in dissolved oxygen provides the vegetation zone 11 of aquatic plant around the island with an appropriate water current, and the nutrient salt is sufficiently absorbed by the plant. Further, the development of phytoplankton as well as of zooplankton is promoted, and the good living environment for fish is produced. |
