There are many varieties of cultivated snails in paddy fields. The snail shells in China Garden are thin, with obvious black edges around the shell mouth, and there are no black edges on the mouth of the Chinese garden snail shell, and the shell is thicker. The natural growth of snails in the paddy fields of the Yongjia Mountains is mostly Chinese snails. The main points of breeding techniques are as follows:
1. Paddy field selection: It is better to select a good muddy field with good water source conditions, sufficient sunlight, and plenty of soil humus. And to be close to the mountain side, in order to avoid the inflow of pesticide field water, the field snail.
2. Preparation before restocking
(1) Heighten the field ridge. Tian Wei is 40 centimeters high and surrounded by nets. The top is 20 centimeters higher than the field surface, and 15 centimeters of mud is buried under it. This can prevent the invasion of voles and snakes.
(2), Qingtian disinfection. Disinfect the medicine with quick lime, use 50-75 kg of mu or 15-20 kg of bleach per mu.
(3) Apply organic fertilizer. After 3-4 days of disinfection, organic fertilizer was applied in the field, fertilizer was mixed with chicken manure and shredded straw in a ratio of 3:1 to base fertilizer, and piles were piled in the field at 300 kg per mu to ferment and rot the fertilizer and reduce the impact on plankton. Growing harmful substances. After 5-6 days, spread the basal fertilizer evenly, and then plow till flat in Daejeon.
(4) Ditching. The total area of ​​the ditch accounts for about 10% of the paddy field area. The form of the ditch may vary depending on the field, and the words “oneâ€, “ten†may be opened, and the ring ditch may be used. The depth of the central ditch shall be 30-50 cm and 50-60 cm wide.
(5) Install a barrage. The snails will escape, especially after the thunderstorms in the evening, snails will escape. Anti-escape methods can be set up in the inlet and outlet of a dense network to prevent snail escape.
3, snail stocking
Split the young snails into snails. Put juvenile snails, specifications about 5 grams, 25,000-30000 acres of species, weighing 125-150 kg; put screw species, specifications 10-15 grams, 30-50 kg acres, species, stocking time, single-season rice planting before stocking The main position of the stocking is ditching.
4, feeding and management
(1) feeding: 1 day or 2 days. In the optimum temperature range (20-28°C), snails eat well, once every two days, each feeding amount accounts for 2-3% of the snail's body weight; water temperature 15-20°C or 28-30°C twice a week Each dosage is 1-2% of the screw; if the water temperature is lower than 15°C or higher than 30°C, it will be stopped or less feed. The feed can also be fed with a mixture of 20% corn, 20% fishmeal and 60% rice bran.
(2) Fertilization of paddy fields: organic fertilizers are mainly used to chemical fertilizers. If urea is used to control 10 kg or less per mu and calcium superphosphate is less than 15 kg, it is necessary to use less amount of ammonium percarbonate. To prevent high-temperature fertilization, it is not advisable to use large amounts of organic fertilizers to avoid polluting the water quality and affecting the growth of snails.
(3) Rice field application: Use high-efficiency, low-toxic and low-residue pollution-free pesticides, such as carbendazim, tricyclazole, dimehypo, and jinggangmycin. Spray the medicine on the rice leaves when spraying to reduce the pesticide concentration in the water.
(4) Apply quicklime in proper amount. It can not only adjust the pH value of soil and water, but also provide calcium nutrition for snail, and reduce the occurrence of pupa contraction due to calcium deficiency. The amount of lime is generally once a month, 6-8 kg per mu.
(5) Prevention of pests and diseases: For predators, to prevent rats and birds from eating snails, in addition, field fish will eat small snails, but it is feasible to stock summer fish species because they cannot eat small snails. Disease prevention, such as the discovery of sepals after the contraction of meat spills, indicating that the snail calcium deficiency, adding shrimp in the feed, light fish meal, shell powder can cure the disease. If the sepals subside, it means that more feed is needed to feed more. If there is a grasshopper in the field, it can be killed by pig blood.
(6) Tianshui Management: During rice cultivation, it is best to maintain micro-flowing water with a depth of 10-20 cm to prevent leakage of dry water and to check the safety of inlet and outlet grilles; increase the flow rate at high temperatures so that there is sufficient dissolved water. oxygen. During the winter, cold snails hibernate into the soil, replacing fresh water once a week, and at the same time, sprinkle chopped straw or weeds in the paddy fields to facilitate wintering.
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