The main supporting technology of shrimp, crab and fish: 1. Field selection: It should be convenient to choose drainage, water supply is sufficient, water quality is good, soil fertility is better and the traffic is convenient. Low-yielding fields and low-lying lands. 2. Variety selection: The rice varieties adopt the high-yielding and high-quality seeds of local varieties, Wuyunjing No.7 or Wuxiangjing No.9. These varieties are high-yield and resistant to fall on the one hand, and they are basically consistent with crabs and shrimps during mature period, and can guarantee shrimp and crab fish. The microclimate environment in the field, on the other hand, is the prerequisite for the development of high-quality, non-polluted rice. Crabs raising crabs usually require the use of crabs that breed in the rivers of the Yangtze River. The size of crabs should be moderate and the specifications should be neat. 3. Planting and stocking densities: Paddy field farming forms a new compound system due to the symbiosis between rice and crabs. Therefore, a wide-row and sparse planting method should be adopted. Generally, the row spacing requirement for rice is expanded to more than 8 inches, and the density is 1.5. Around a million holes, and to open a set of ditch, give full play to the water, light, heat, gas and other resource advantages of paddy fields. The area of ​​ring ditch, field ditch and holding pool should generally account for 20% to 30 of the total paddy field area. About %, to ensure crabs have a good habitat, clam shell environment. The nutrient density of raising crab plots should not be too high, generally 600~900 high-quality crab seedlings can be placed in the mu. 4. Rice field management: Applying basic fertilizer before transplanting rice, generally applying 200-300 kilograms of cake fertilizer and 40 kilograms of high-yield in Mushi, promoting basic application of manure, applying 10 kilograms of urea per mus, reducing the use of panicle fat, and promoting secondary use. , Mushi urea 17.5 kilograms; weed control insect pests, mainly to manual weeding, rice growth later than the conventional drug use to reduce the number and dosage, reduce drug concentration, and use high-efficiency low-toxicity pesticides, timely replacement of water once; Water slurry management requires that 5 to 10 cm of water be kept in the paddy fields, and a short period of time for precipitation should be used for light when the field is put down, and the water level can be lowered to expose the paddy fields.
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