Pond cage breeding experience
Li Shi, a “great breeder of yellow crickets†in Niuzhou Village, Nan Da Shan Town, Lancang City, has more than 10 years of history in raising cages. He has developed 500 urine cages, and has an annual output of 15,000 kilograms of radix astragali with an annual net income of over 250,000. yuan. Lao Li introduced that, based on his many years of experience, the key to mastering the high yield and efficiency of cage culture is to grasp the following points. In the case of cages for raising clams, ponds with larger areas, water depths of more than 1.5 meters, less silt at the bottom of the pool, good water sources, and convenient water injection and drainage should be selected. The cages should be made of high-quality polyethylene mesh sheets, with a length of 3 to 4 meters, a width of 2 to 3 meters, a height of 1.3 to 1.5 meters, and a mesh mesh of 10 mesh to 32 mesh. The four corners of the cage are inserted into the bottom of the tank near the water inlet with bamboo and coarse bamboo inserted vertically. The bottom of the tank is 40 centimeters away from the bottom of the tank. The top of the tank is 50 centimeters above the water surface. The depth of the tank is 0.8 to 1 meter and the distance between the tanks is 2 meters. In the box, aquatic plants such as peanuts and water hyacinths are cultivated, and water plants cover 80% to 90% of the cages. Inside the box, a 60 cm 40 cm bait station was made with a dense mesh cloth and fixed at 20 cm below the water surface. Net cages shall be installed 10 days before the seedlings are released. The total area of ​​cages set in the pond should not exceed 20% of the total surface area. The key to success in the selection of nursery cages is the selection of seedlings. Healthy seedlings are well-proportioned, robust, free to swim, smooth and blood-stainless, with normal mucus secretion, non-sticky, and catching jaundice. To collect wild seed, it is better to choose a cage to catch the seedlings, and avoid using electric pick-ups, fishing catches, and drug-harvesting shoots. Large-scale cages raise cockroaches and seedlings can be picked in the following ways: 1 Look at the water method. The water used to hold the containers is clear water, indicating that the batches of seedlings are kept for a long time and the constitution is weak and should not be purchased; if the water is cloudy, This shows that these batches of seedlings are not raised for a long time and their physique is relatively strong and can be purchased. 2 salt soaking method, soaking the seedlings with 3% to 5% of salt, four to five minutes the body has injured the seedlings will be vigorously bouncing, poor physical will occur coma, or weakness or body deformation, such seedlings are not Purchase; if the seed is normal, it can be purchased. 3 vortex method, the seedlings into plastic pots, add half a pot of water, hand-rotating in a certain direction spiral to form a vortex, poor seedlings generally in the middle of the vortex; good seedlings with strong water resistance, in pots On the edge, you can buy the seedlings on the edge. 4 Deep-water pressurization method, put a half-barrel seedling in a fish bucket, fill the water and cover it. After 5 minutes to 10 minutes, lift the cover and float on the surface of the water. The head protrudes from the surface of the water and is resistant to hypoxia. Poor sex, weak constitution, and sickness can not be purchased; for the healthy seedlings that sink into the bottom of the barrel, they can be purchased. Feeding cages for stocking seedlings is generally conducted from May to July. The temperature is stable at this stage, and the water temperature is above 25°C. It is suitable for stocking of the astragalus. After 4 months to 6 months of feeding, Huang Qi can reach the market specifications. The weight of 30 grams to 60 grams of quail species, stocking density of 1.5 kg to 2 kg per square meter is appropriate, with the seedlings in the box to maintain the same size, once enough. At the time of stocking, soaked in 3% to 5% saline for 3 minutes to 5 minutes.
Catalysts can induce chemical reactions to change and make chemical reactions faster or slower. Catalysts are also called catalysts in industry. The composition, chemical properties and quality of the catalyst did not change before and after the reaction. It mainly includes solid acid-base catalyst, molecular sieve catalyst, metal catalyst, metal oxide and metal sulfide catalyst, and complex catalyst.
1. Acid-base catalysts: Petroleum refining and petrochemical industry are the largest application fields of catalysts, occupying an important position in the national economy. Acid catalysis plays an important role in petroleum refining and petrochemical industry. Solid acids are further divided into Blans Te Um (B acid) and Lewis acid (L acid). Typical solid base catalysts: MgO, CaO, SrO2, etc; typical solid L acid catalysts: AlCl3, FeCl3, etc.
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