First, the method of cultivation of Vallisneria 1. Sowing period: Generally, the water temperature is above 10°C. In the middle and lower reaches of the Yangtze River, the appropriate sowing period is from March 10 to early May. The best sowing date is from late March to early April. 2. Planting water area requirements: Pottedgrass can be planted in ponds, lakes, shallow waterways or at the edge of river channels. Aquatic waters with a transparency of more than 40 cm are required. The ponds with poor water quality, fertile water and low transparency are generally not ideal. The reason is that freshly sprouted puppies cannot perform normal photosynthesis. Must be planted in shallow water about 3-10 cm during the planting process. 3. Sowing method: Seed sowing amount of bitter buckwheat, generally 1 kilograms of Vallisneria seeds can sow 6-20 acres. In the middle of March, sowing is usually done in mid-March, and then repeated in early April. Before sowing, the seeds are placed in a container and soaked in water for about 5 days. The fruits of the fruit are often soaked in the mash. The seeds in the linear fruits are soaked, and then the fine soil is mixed with the shallow water in the pool. The area is evenly divided, or the mixture is mixed with mud and the water is splashed in the shallow water area. Avoid windy weather when sowing, so as not to be blown by the wind to the edge of the pool and uneven planting. Select a well-defined, well-balanced bean crab or crab, choose a suitable stocking density, and stock it in a timely manner. 1. Clearing and disinfection of crab ponds: After the completion of the excavation of new crab ponds, Qingchao Lake is generally used for 15 kg/mu. When the ponds are clear, they should be kept at a depth of 10 cm or more and after 15 days or so, after the drug toxicity in the clear ponds. Only surplus water can be released. If you are using old crabs and pools in addition to tea and clear ponds, use a mixture of quicklime (25kg/mu) plus bleaching powder (2.5-5kg/mu) for bleaching ponds to disinfect the pond. The old pool will be cleaned with drugs. Remove excess silt from the pond and expose it to dry pond for a while. 2. The selection of quality bean crabs and dunk crabs requires that the dungeons have the same specifications, medium size, complete appendages, strong physique, active crawling, and no disease or injury. According to my county's years of cultivation, the general culture of the dung beetle, the breeding effect is relatively ideal, and after long-distance transport or in the cage in the long time of dungeon crab farming most of the effect is not ideal. 3. Stocking time and stocking density: The date of stocking of crabs and crabs is generally April. If the weather turns cold, early seedlings are susceptible to frostbite. The stocking time of crabs is generally from January to March, and it is usually selected for good weather for stock raising and grass cultivation. The stocking density of crab pond crab species should not be too high, generally 500-1000 beans/mu, and 200-300 eggs/mu. Bean crabs require that the stocking specifications should not exceed 6,000/kg, and the standard for crabs should be 200-400/kg. In addition to good stocking of crabs in adult crab pools, attention should be paid to the stocking of fish stocks. Generally, 30 stocks of white pheasants with 16-20 tails/kg are stocked per acre, 10 pods are used, and a small amount of silver oysters are stocked. In general, grassy grasses and other herbivorous fish should not be inserted, and stocking of herring and herring should be prevented. In January-March, 4000 kg/kg of wintering larvae (1.5 kg/mu) can be placed, and until July, 2.5-5 kg/mu of green shrimp can be harvested. Third, reasonable food feed In the feeding of feed, we must adhere to the "two fine, middle green", especially in the 4-6 months must strengthen the feed, and cast more animal feed, the early supply of the fish due to insufficient supply, if with the feeding Crab granules, the better. Generally, the amount of feed fed from April to July accounts for 30% to 35% of the total amount of feed, and the amount of daily feed accounts for 8% to 10% of the weight of the crab. Only by increasing the feeding amount of crab feed can it be well protected. The germinating bitter fungus further improves the pond's ecological environment. In addition to strengthening the feed for feeding and protecting the aquatic plants, 25-50 kg/mu of fresh snails should be added to the pool. In summer, due to high temperatures, more food such as bean cakes, wheat, and squash should be fed. The feeding of crab crabs is usually done in the evening. If the crab pond area is small, as long as the bait spreads to the beach feet around the pond, if the crab pond reaches 30 mu or more, the pool will have plenty of water and grass besides the pond. In addition to feeding, we should also feed the fish evenly in the middle of the pool. Fourth, daily production management 1. Management of Vallisneria sowing: When the water temperature is 10-18°C, the seedlings begin to germinate 5-10 days after sowing. When the water temperature is above 18°C, the germination time is shortened, and many young fibrous roots are grown just after germination. The seeds are sown for 30 days. When the leaves are about 5-7 cm in length, the leaves are 0.2-o.4 cm in width, and the leaves are hypertrophy in emerald green; when the length of the leaves is about 10 cm, the stem base of the plant begins to grow 1-4 pieces of vinegrass. Stems sprout on each stem and grow into new plants. Therefore, after sowing borage, the water level should be controlled to be above 6-20 cm until mid-June, and the water level should be increased to more than 30 cm in late June. At this time, bitter grass is full of ponds, and the depth of water is increased to 60-80 in mid-July. cm. After sowing grass is sowed, appropriate management measures are taken according to the amount of the input crab species. When the crabs are stocked at 250/mu or below 600/mu, the crabs will be released directly to the pool and the pre-strength investment will be increased. Feed animal fish such as small fish, river otters and snails, and pay attention to the protection of aquatic plants. When the amount of detained crabs is up to 250 or the stock of beans and crabs reaches 600 or more, it is best to enclose the crabs in a corner of the pond with a mesh net, which is equivalent to 1/8 of the pond's total area, in the fence. Feeding of the crabs in the feed is enhanced. When the ponds are basically full of ponds, the nets are removed and large-scale farming is carried out. 2. Water quality management: After the growth of Vallisneria, the water quality in the pond is generally relatively fresh. When the water quality is adjusted, the crab pool water is made to be “shallow, full summer, and autumnâ€, so that the crabs always live in a better environment. Grow. The exchange of water quality generally insists on changing the water once every 10-15 days, and should increase fresh water as much as possible. In the water quality management of crab ponds, water peanuts should be added around the pond to improve water quality. At the same time, every limestone should be splashed with lime every 20-30 days. The amount of lime in crab ponds should not be too high, and it should be used as water depth per acre per meter. The amount of quick lime does not exceed 15 kg. 3. Disease Prevention and Control of River Crabs: The main prevention and control of black leeches and edema of river crabs should generally be carried out once a month with chlorine-containing drugs Quanchipue, and be prevented with oxytetracycline combined with oral administration. The prevention and treatment, generally after the beginning of autumn chlorine dioxide Quanchiposa once, and combined with the new prevention and treatment of "shivers" drugs such as virus busters, glocking spirit, such as taking a week for prevention. Five, long-term grass-seedlings, crabs, investment and output, acres of 200 acres of ponds, ponds, general mu input 1,000 yuan. Until October-November, the average catch rate of crabs was over 60%, 20 kg of crabs were produced per mu, and 3000 yuan was produced per mu. The benefit of the mu was 2,000 yuan. Cosmetics are compound mixtures made from various raw materials after reasonable blending and processing. 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Second, timely stocking