First, chase fertilizer materials. In early spring when the pond water temperature stabilized at 8 °C ~ 10 °C, it began to chase fertilizer. The amount of fertilization should be determined based on the quality of water, fertilizer, and fertilizer quality. Generally, 60-90 kilograms of human excrement per mu or 100-150 kilograms of livestock manure is applied. If chemical fertilizers are used, the ratio of nitrogen, phosphorus and potassium is 1:1:0.5. When the topdressing is applied, the total amount of water per acre is 3 to 7 kg and the interval between topdressing is 5 to 10 days. . The water quality is kept in tan or yellow-green color with a pool of water, and a transparency of about 30 cm is appropriate.
Second, feed the bait. In early spring feeding, concentrates such as bean cakes, bran, and corn flour should be used as the main ingredient. Each day, they should be fed regularly and regularly for 1 time. Each feeding amount should be 1.5% to 3% of the fish's body weight. Afterwards, as the water temperature rises, the number of feedings is gradually increased, and feeding is repeated twice a day. At the same time, appropriate amount of plants should be fed to the pond that raises the grass carp, and the feeding amount should be 4 to 6 hours. The specific feeding amount should also be flexibly controlled according to the water temperature, the weather, and the fish's feeding conditions.
Third, water injection technology. In early spring, due to the low water temperature, the individuals of the fish are small and their food intake is small. The pool water should not be too deep. As the water temperature rises, the fish body increases and gradually deepens the water level. It is better to change the water once in the early spring and replace it by 1/2 of the whole pool. After 15 days of water injection, raise the water level by 10 to 15 centimeters each time, keep the pond water level 1 meter from March to April, and at the same time, prevent the inflow of sewage and enemy pests.
Fourth, disease prevention and treatment. Ponds should be managed by dedicated personnel and adhere to the practice of patrolling the ponds every morning and evening to check the water quality and determine the amount of fertilization and feeding. Timely salvage residual food, keep the pool water clean, and prohibit the feeding of deteriorated feed. Drugs are regularly administered to prevent fish disease. Every 15 days, 110-6 bleach and 0.710-6 cupric sulfate solution are alternately sprayed one at a time. If fish diseases are diagnosed and treated in time.
The iodine molecule it releases will kill the bacteria, oxidize active gene in bacteria cytoplasm and combine with amino of protein to change its nature, thus to kill the bacteria, fungi, virus and Amoeba. Its bactericidal activity is proportion to its concentration, and its corrosivity and irritation to body is also proportion to its concentration.
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