1. Organic fertilizer topdressing method. Organic manure includes all kinds of human and animal manure, each applying 100 kilograms per acre, fertilizing once in 7-10 days, and can be divided into small heaps and whole ponds. You can also take a fertilization method. That is, use a wooden rod as a stand. Wicker foil is used as a chassis, and several shelves are placed in the deep water area of ​​the pool. The manure is put on the rack and put close to the water to make the fertilizer decompose and spread in the middle and upper layers of the water. It is also possible to hang bags, that is, to hold the fertilizer in a rot-resistant bag and hang it on the wooden poles in the deep water area of ​​the pond so as to allow it to decompose and spread on its own. Trips and bags of fertilizers can speed up the decomposition of fertilizers and evenly spread the fertilizer to the entire fishing pond. In particular, special fertilizers can be decomposed and corrupted in the water layer of the pool. This will not cause oxygen deficiency even though the fertilizer is decomposed quickly. Let the fish float. 2. Fertilizer topdressing method. Fertilizers for fish ponds are mainly nitrogen and phosphate fertilizers with a ratio of 1:2. Under normal circumstances, 2.5 kg of urine per mu, 5 kg of phosphate fertilizer, the first use of water-soluble, and then evenly spilled the whole pool, 5 to 7 days Shi once. 3. Green fertilizer topdressing method. Green manure consists of a variety of land-based dry grasses, which are sun dried to a half dry state, then mixed with a certain amount of manure, heaped in the corner of the pond and pressed with stones or mud, and then turned once every 3 to 5 days to cause decomposition. The liquid gradually spreads in the pool, and it can generally be decomposed after 7 to 9 days in the fall, and then the coarse and hardy roots are removed, and then the new material is added, and 100 kg of green manure is applied per acre. Animal And Vegetable Oil,Flaxseed Oil,Rosemary Oil,Evening Primrose Oil Shaanxi Haibo Biotechnology Co., Ltd , https://www.rozenbio.com