Greenhouse Flat Hydroponic System is increasing
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Key technical points for applying fertilizer in small reservoirs
Small reservoirs generally have a water depth of about 10 meters, and are rich in dissolved oxygen and food. The area is small, ranging from tens of acres to several hundred acres. It is an ideal surface for fertilizing fish. Combined with the application of fertilization and breeding technology in dozens of small reservoirs in our county, several points are introduced. I. Reasonable stocking 1. One of the main experiences of stocking large-scale fingerlings in fish stocks is to stock large fingerlings. Reservoirs have more predators than ponds, poor food basis, small fish species have poor ability to escape predators, and have low feeding capacity, so the size of stocked fish species is too small and the survival rate is low. Generally, large-scale fish species larger than 13 cm should be stocked in order to achieve higher catch-recovery rates and commodity rates. 2. The use of chemical fertilizers for fish farming should be rational, and fish should be dominated by alfalfa. Its production can account for more than 90% of the total fish production, and the proportion of stocking cockroaches and cod fish is 4:1. With grass, cockroaches, carp species accounted for 20% -30%. Reservoir stocking density, should be based on the number of food organisms in the water and how much fertilizer, generally 200-500 mu, when up to the product specifications. 3. Timely stocking of reservoirs to put fish in order to better stocks in autumn and winter, fish species can adapt to the surface water environment in advance. At the same time, due to the weakening of ferocious fish activity in winter and reduced food intake, the survival rate of fingerlings will be improved. Placement points should be chosen to be sheltered from the wind in the upper reaches of the sunny area, and should not be placed near dams and drainage gates. Second, the rational fertilization of small reservoirs The key to high-yield fish farming is the rational use of fertilizer. Fertilization should be determined depending on the conditions of the water body and the season. The transparency should be 25-30 cm after application and the water color is brown or brownish green. From April to May, organic fertilizer is mainly applied, 250-300 kg of organic fertilizer is applied per mu, and inorganic fertilizer is applied concurrently; inorganic fertilizer is mainly used in June-August, and nitrogen fertilizer and phosphorus fertilizer are applied in a mixed ratio of 2:1. Nitrogen fertilizer application 1.5 to 2.5 kg/mu, phosphate fertilizer 2.5 to 5 kg/mu, applied once every 10 to 15 days. The main nitrogen fertilizer is urea or ammonium bicarbonate, and the main phosphorus fertilizer is calcium superphosphate. The first application of phosphate fertilizer followed by nitrogen fertilizer cannot be reversed to avoid causing dead fish. Fertilizer selection is applied on sunny days in the shallow water area of ​​the upper and middle reaches of the reservoir by the sprinkling method. Avoid the thickets of aquatic plants and the downstream deepwater areas and near the dam. Third, fish disease prevention and control of small reservoirs should be mainly prevention, prevention and treatment. The fish species must be disinfected before stocking; the deafness can be used to suspend the whole of the stone, and the quality of the water can be regularly adjusted during the hot season, and fish diseases can be promptly treated. Gills often occur, print disease, there are anchor heads, fish parasites. Bacterial disease can be used bleaching powder 1 g / cubic meter full library spatter, parasitic disease can be used 90% crystal trichlorfon 0.3-0.5 g / cubic meter full library spill. Fourth, daily management Frequent application of quicklime to increase the pH and hardness of the water through the use of lime, increase calcium salts, promote material circulation in the water, improve water quality, is conducive to fish growth and inhibit the occurrence of fish diseases. Generally, 15-20 kg lime is applied per acre, once a month. 2. Timely removal of wild fish stocks before the stocking season, the use of joint fishing gear in the dry season in winter to kill wild fish or wild drugs. During the cultivation period, seine nets and trawl nets should be used regularly to trap wild fish and increase the survival rate of the species. 3. Mechanical supporting small reservoir fertilization intensive, there must be oxygenation equipment, transportation equipment, irrigation and drainage equipment, anti-escape facilities, fishing nets. 4. Specially managed reservoirs should be staffed on duty, pay attention to listening to the weather forecast, understand flood prevention, irrigation, etc., constantly check the fish-blocking facilities, salvage floating objects in time, ensure smooth water outlets, and prevent fish from fleeing. Always observe good or bad water quality and check fish growth conditions for proper fertilization.
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