The use of shallow water for the cultivation of clams and the cultivation of green prawns results in both good harvests of clams and crawfish as well as good economic and ecological benefits. First, farmland infrastructure construction should be selected to facilitate irrigation and fertility, soil fertility, light conditions, good cultivation of paddy fields, with an area of ​​3 acres to 5 acres is appropriate. The outer ring ditch with a width of 0.5m and a depth of 0.8m is excavated around Putian. A ditch with a width of 0.5m and a depth of 0.6m is excavated every 2.5m. The ditch and ditch shall be opened in a "king" and "field" shape. To ditch and ditch communicate. There are injection and drainage systems on both sides of Putian, and anti-escape facilities such as dense fences and iron nets are installed at the injection and drainage outlets. Before flooding in Putian, 30kg to 35kg of water per acre was used to splash the whole pond. 2. Transplanting and Management of Alfalfa Seedlings 1. Seedling Transplanting Alfalfa is used for germination in April to May. The seedlings are transplanted at 45 days. The distance between transplanted holes is 50 cm to 60 cm. 1 plant per hole or 3 plants are planted. ~ 5 vegetative shoots 1 plexi, mus planted 1500 ~ 2000 strains. 2. Putian management (1) Fertilization Before transplanting, deep application of manure, green manure and Other organic fertilizers, organic fertilizer should account for 70% of the total amount of fertilizer; In addition, 2 kg to 3 kg of urea per acre. During the breeding season, compound fertilizers containing nitrogen, phosphorus, and potassium and soil miscellaneous fertilizers must also be applied. (2) Water management The field water level is maintained at 8 cm to 10 cm after transplanting. (3) Prevention and control of diseases The main prevention and control of Fusarium wilt, rickets, etc., should be selected as the most efficient and low toxicity pesticides. Third, the implementation of fresh shrimp and management 1. Transplanting water plants and grasses can not only provide plant food for the green shrimp, but also provide shelter and habitat for the green shrimp, but also become the attachment of green shrimp shelling. 2. The penaeid shrimps to be transplanted shall be allowed to be transplanted for 7 days to 8 days after the start of development. In the morning, 0.2 kg to 0.5 kg of egg-bearing shrimps will be stocked in more than one acre. 3. Reasonable feeding of fresh shrimp like eating Peanut cakes, bean cakes, rice bran, distiller's grains and other plant foods, as well as snails, cockroaches, cocoon and other animal feed. Green shrimps are mainly fed with powdered material during the seedling stage and pelleted foods are fed later. Generally, it is advisable to feed along the ditch side once a day, and the amount of feeding is 5% to 10% of the body weight of the shrimp, and it is advisable to eat basically or slightly remaining on the morning of the second day. 4. Water Quality Management Green shrimp have higher water quality requirements. In the high temperature season, change the water every 5 days to 7 days. Change the water by 1/3 each time. When changing the water, keep the water depth 0.5 meters or so. Normally, Putian should maintain a high water level. IV. Harvesting In order to obtain higher yields of plutonium and shrimp, it is best to harvest shrimp and harvest pupae in November.
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