The application of chemical fertilizer on fish in the reservoir is a non-feeding (green, fine bait), non-application (fish medicine, pesticide), disease-free, fast growth, easy operation, quick effect, high efficiency, no pollution, no Pollution aquatic aquaculture technology. The main principle of fertilizer fish farming is to make full use of the characteristics of adequate water source, non-pollution, and sufficient oxygen in the reservoir to scientifically apply a certain percentage of nitrogen and phosphate fertilizer under certain conditions to cultivate water quality and supplement nitrogen and phosphorus in water bodies. Elements, and through photosynthesis, promote the reproduction of plankton. Provides ample biological feed for alfalfa and other omnivorous fish. During the whole breeding process, the fish are always grown in a good ecological environment, so as to greatly increase the yield and quality of farmed fish. In the county's Yanqian Reservoir, about 800 acres of fish surface water. Last year, in accordance with the fishery technology of fertilizers, the fish species were placed every year. In the year, 100,000 species of clams and squid were put in place, 380 tons of chemical fertilizers were used, and the production of fish was increased from more than 10,000 kilograms to more than 80,000 kilograms. Products are very popular with consumers. The success of the reservoir fertilizer fish farming will become a new economic growth point for the development of pollution-free fishery production in reservoirs in the mountains of Meizhou and a new way for mountain farmers to shake off poverty and become rich. The main technologies of the reservoir fertilizer fish farming are as follows: 1. The selection of fish breeding water surface Where there are sufficient water sources, no pollution, broad water surface and a certain shallow water area (below 3 meters), it is not easy to dry up, and convenient transportation of the ponds and reservoirs All suitable for fertilizer fish. Second, the release of fingerlings According to the water quality of the aquaculture water body and the different feeding habits of fish, the quantity, specifications, and mix proportions of the fish fingering are: 1. Quantity: The mu stocking quantity shall be determined according to the planned output, and the general mu shall be allocated to all kinds of fish species. 300 or so. 2, Specifications: It is best to use fish every other year. Generally require seedlings more than 5 inches, seedlings more than 4 inches. 3, the mix of varieties: mainly in the pipa, pipa-based. The general population accounts for 40%, earthworms 50%, and other omnivorous fish 10%. Third, the choice of chemical fertilizers and the proportion of fertilizers should be selected fast-acting ammonium bicarbonate and superphosphate. The actual amount of nitrogen and phosphorus used for fish fertilization is 1:1. That is, each time 100 kg of nitrogen fertilizer is used, 100 kg of phosphate fertilizer should be added. Fourth, the time, number and frequency of chemical fertilizers to be applied 1. Fertilizers should be selected from April to October when the sun exposure time is long, with emphasis on July-September. Fertilization must be done on a sunny morning. At the same time, the water temperature must be above 20°C. 2, the amount of fertilizer. The annual fertilization amount should be determined according to the water quality, the number of fish species and the economic strength. In general, the amount of fertilizer should be reasonably grasped according to the principle of planned production and the fishery factor of 2-3. 3, the frequency of application of chemical fertilizers. Throughout the fertilization season, after each fertilization, the water body is transparent to small reservoirs of 30-35cm, medium to large reservoirs of 35-40cm, and 5-15kg per mu. Under normal circumstances, the water temperature is 20-25°C, once every 8-10 days; the water temperature is above 25°C and once every 5-7 days. Fifth, the location and method of fertilization 1, fertilizer should be selected within the depth of 3 meters, the water temperature is higher, the wind wave is smaller, the fish more upstream shallow water area, coastal belt and the distance away from the water culvert gate library bends and other places. 2, fertilization method. The best way to fertilize is to crush the phosphate fertilizer every time on the first day and sprinkle it at the fertilization point. The next day, the nitrogen fertilizer was minced in the same way and sprinkled again. VI. Precautions 1. The ratio of the fish species to be put into chemical fertilizer should be adapted to avoid wastage and affect the aquaculture production and economic benefits. 2, in strict accordance with the nitrogen, phosphorus 1:1 application amount. 3, the water temperature is low, the rainy days are not suitable for fertilization. 4. Do not put chemical fertilizers into the vehicle and pour the whole bag directly without breaking it, so as to avoid reducing fertilizer efficiency. And we must adhere to the principle of applying nitrogen before the application of phosphate fertilizer. 5. Chemical fertilization should avoid the peak period of flood storage, flood discharge and irrigation. If it is really necessary to discharge water, it should try to open the bottom culvert.
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