1. Rice field finishing. Paddy field selection should be easy to use for feeding and fortification to escape from the wall, and field ridges should be raised and widened. Generally, field ridges should be raised to 50-60 centimeters and the top width should be 50-60 centimeters. The "well" or "tian" type ditches should be excavated in Tianzhong. The standard depth is 30 centimeters and the width is 40 to 60 centimeters. Excavate a 6 to 8 square meter sink with a low head and a depth of about 60 centimeters to make the crab handle and the young crab in autumn. use. In the opposite corners of the paddy field, a drainage ditch is set up. The pipeline is better. The inner end of the water pipe is changed into a double-layer net. Then the 40-day barrage is set to prevent young crabs from escaping and the danger of frogs and voles. Put anti-escape walls before putting crabs. There are generally two methods. First, the inner side of the field ridge is embedded with a glass steel fence, the fence is 60 centimeters high, and the exit surface needs to retain 40 centimeters; the second is to use bamboo rakes and small piles as the skeleton to lay the film again, 60 centimeters high, buried under 10 ~ 1 5 cm, tilted inward 30 degrees, semi-circular corners. In addition, some labor can be set in the paddy field. Concealed, this helps to reduce the larvae and increase their survival rate.
2. Feed management. The types of early river feeds include fresh water grass and fish gills, shrimp gizzards and cooked pig blood. , Tofu, etc., can later increase snail meat, stew meat, bean dregs, crushed rapeseed cake, bean cake, cooked corn, wheat, pumpkin and restaurant waste, slaughterhouse waste. When feeding early, use gauze filter, feed 3 to 4 times a day, and the feeding amount is 30% to 50% of the total weight of crabgrass. Feed it once a day at a later time, and feeding should be done in the evening to accommodate crabs. The habit of asking for food at night was estimated to be 5% to 8% of the total weight of the crab seedlings, and the water quality, weather, temperature, and crab clam shell metamorphosis and other factors will increase or decrease. Food, ensure that crabs are full, eat enough and not excess.
3. Water quality management. Rice fields were infused with fresh water when they were released. The depth of water is 10 cm. It gradually deepens with the rise of water temperature and the growth of river crabs. The hydration of paddy fields is stable at 15 to 20 cm. It is injected and drained once a week, each time about 5 to 10 meters, guaranteeing fresh and live crabs. , high dissolved oxygen in the water well-developed, lime once a month, the amount of 20 kg / acre, so that the water quality was slightly alkaline. In order to achieve the purpose of sterilization, disinfection, and calcium supplementation, according to the quality of water, it can be top-dressed as appropriate. Every month, people can apply 100-130 kilograms of dung or 5-7 kilograms of urea. If conditions permit, we can maintain micro-flowing rice fields to stimulate the appetite and increase the number of shells.
4. Disease prevention and treatment. Rice fields are shallow and young crabs are easily attacked by predators. For example, waterflies, jaundice, etc., must be driven or killed. In particular, mice are killed. It can kill and bite 20 to 30 juvenile crabs overnight. The method of extermination can be used. Rodent control and manual capture. The transplanted aquatic plants should be soaked with lime water of 20-30 g/m3, and periodically treated with quicklime to disinfect the water. It can also be used to prevent disease and regulate the quality of water. It is necessary to choose high-efficiency and low-toxicity when applying rice pesticides. Low-residue pesticides should be applied on a piecewise basis to minimize pesticide contamination. Water should be changed after application to ensure that the water is non-toxic. Juveniles are usually harvested before cutting rice in mid-late September.
2. Feed management. The types of early river feeds include fresh water grass and fish gills, shrimp gizzards and cooked pig blood. , Tofu, etc., can later increase snail meat, stew meat, bean dregs, crushed rapeseed cake, bean cake, cooked corn, wheat, pumpkin and restaurant waste, slaughterhouse waste. When feeding early, use gauze filter, feed 3 to 4 times a day, and the feeding amount is 30% to 50% of the total weight of crabgrass. Feed it once a day at a later time, and feeding should be done in the evening to accommodate crabs. The habit of asking for food at night was estimated to be 5% to 8% of the total weight of the crab seedlings, and the water quality, weather, temperature, and crab clam shell metamorphosis and other factors will increase or decrease. Food, ensure that crabs are full, eat enough and not excess.
3. Water quality management. Rice fields were infused with fresh water when they were released. The depth of water is 10 cm. It gradually deepens with the rise of water temperature and the growth of river crabs. The hydration of paddy fields is stable at 15 to 20 cm. It is injected and drained once a week, each time about 5 to 10 meters, guaranteeing fresh and live crabs. , high dissolved oxygen in the water well-developed, lime once a month, the amount of 20 kg / acre, so that the water quality was slightly alkaline. In order to achieve the purpose of sterilization, disinfection, and calcium supplementation, according to the quality of water, it can be top-dressed as appropriate. Every month, people can apply 100-130 kilograms of dung or 5-7 kilograms of urea. If conditions permit, we can maintain micro-flowing rice fields to stimulate the appetite and increase the number of shells.
4. Disease prevention and treatment. Rice fields are shallow and young crabs are easily attacked by predators. For example, waterflies, jaundice, etc., must be driven or killed. In particular, mice are killed. It can kill and bite 20 to 30 juvenile crabs overnight. The method of extermination can be used. Rodent control and manual capture. The transplanted aquatic plants should be soaked with lime water of 20-30 g/m3, and periodically treated with quicklime to disinfect the water. It can also be used to prevent disease and regulate the quality of water. It is necessary to choose high-efficiency and low-toxicity when applying rice pesticides. Low-residue pesticides should be applied on a piecewise basis to minimize pesticide contamination. Water should be changed after application to ensure that the water is non-toxic. Juveniles are usually harvested before cutting rice in mid-late September.
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