The white field sets up crabs. It can make full use of the ecological environment and biological resources in the white field and make the white crabs and river crabs take their own needs. This will greatly increase economic efficiency. Generally, every 667 square meters can produce konjac white 800--1000kg, and harvest commodity crabs 50--60kg. The relevant technologies are introduced as follows:
First, the choice and preparation of Ling Baitian choose ample water, good water quality, non-toxic, pollution-free, irrigation and drainage of the land, with an area of ​​2000-3500 square meters is appropriate, the bottom sediment to better water retention properties of sandy loam or clay for good. In the white field, crab trenches were excavated, with a 1.5--2m wide groove and a 1-1.2m deep groove. Digging mud raises and widens the surrounding fields. The fence shall be constructed with calcium plastic plates, asbestos tiles or other materials to prevent escape. The wall height is 0.5--0.6m, buried in soil 0.1m, and slightly tilted to the inside of the field, the inside of the field should be smooth, no support Things. The corner of the escape prevention wall is rounded. The inlet and outlet ports shall be sealed with polyethylene mesh, and a bamboo fence shall be built on the outside. The mesh shall be covered to prevent the crab from escaping from the inlet and outlet.
Second, the white planting
1. Apply base fertilizer. Before planting eucalyptus, the plots should be ploughed, exposed to sunlight and soaked in water. Then, 500--800 kg of organic fertilizer should be cooked per 667 square meters, and 40 kg of superphosphate should be used as base fertilizer (uniformly applied to the soil surface).
2. White varieties selection. There are many white plague varieties, and good varieties with high yield, strong resistance and early maturity should be selected according to local conditions and suitable for planting in deep paddy fields.
3. White transplanting. General requirements in the first half of April for transplanting, between the white line 1m, spacing 0.6m, transplanted every 667 square meters 1000 - 1200.
Third, the proper cultivation of aquatic fishermen are: "crab size, see plants, crabs, see plants." This shows the importance of aquatic grasses for raising crabs. At present, most plants are planted with hardgrass. For every area of ​​667 square meters, 30--50 grams of Vallisneria seeds are used. The method of cultivation of Vallisneria seedlings is similar to that of rice mulching. When the grass grows to about 10cm, it is planted in the field using the rice “casting method†and the crabs can be placed until they reach a length of about 30cm.
Four, juvenile crabs in stocking larvae after the survival of white crabs can be stocked, the juvenile crabs stocking specifications to 40--60 / kg is good, stocking 20--30kg per 667 square meters, can also be stocking specifications for 100- -200 animals/kg, stocking 10 to 15 kg per 667 square meters. The stocking young crabs require uniform body color, neat specifications, robust physique, and no disease or injury. In addition, in order to allow the crabs to feed enough of the food after they have landed in the field, 150 to 200 kg of freshly treated snails are disinfected every 667 square meters before and after Ching Ming. Tiangou added some araceae, duckweed and so on.
V. Field Management
1. Feed the bait. Feeding or restocking should be done with "four settings" (fixed, regular, quantitative, qualitative). In May-June, the young snails that lived with live snails before and after Ching Ming were the main species; from July to September, besides the squash, wheat, soybeans, and other plant foods, fish, shrimp, and pigs should be supplemented in a timely manner. Blood, silkworm cocoons, snails, clams and other animal foods to meet the nutritional needs of crab growth.
2. Water quality regulation. The growth and development of crabs requires very strict water quality. Therefore, attention must be paid to observing changes in water quality and weather changes at any time, and timely regulating water quality and water levels. Normally, the water depth in the field should be 0.2--0.3m, and the water depth in the ditch should be 1m. In the hot season, it is necessary to insist on changing the water frequently. Generally, the water is changed every 2 to 3 days. Each time the water is changed by about 0.2m, the water quality is not greasy, but it is not light. When changing the water, avoid using a piece of water to fill the fields.
3. Adhere to daily field inspections. Pay attention to preventing escape, leaking, poisoning and preventing snakes and rats from harm.
4. Disease Prevention and Control of Crab, Crab, Pak. White crabs in the field can reduce the occurrence of pests and diseases, and generally do not require the use of pesticides. Even if pests and diseases occur, biological control should be used as far as possible, with no or little use of pesticides. It is strictly prohibited to use pesticides such as buprofezin, methamidophos, omethoate, 1605, carbofuran, pyrethroids, and imidacloprid. The application must be done after sunny dew. Change the high-concentration spray to a low-concentration spray and use a nozzle with a 0.7mm hole diameter. At the same time, the drug should be sprayed as far as possible on the upper middle of the plant to reduce the liquid falling into the water. In case of improper application of pesticides, pesticide concentration is too high, should be quickly filled with "Happy Valley" to ease the phytotoxicity.
Six, pick crabs generally start crabbing in the middle and late September. The methods of catching include catching crabs in the water, catching them by hand in the night, and trapping them. After the crabs are caught, they must be sold in time.
Wang Shulin (Yifeng Town Fisheries Station, Yandu County, Jiangsu Province, China Postcode: 224022, Tel: 0515-8663986)
First, the choice and preparation of Ling Baitian choose ample water, good water quality, non-toxic, pollution-free, irrigation and drainage of the land, with an area of ​​2000-3500 square meters is appropriate, the bottom sediment to better water retention properties of sandy loam or clay for good. In the white field, crab trenches were excavated, with a 1.5--2m wide groove and a 1-1.2m deep groove. Digging mud raises and widens the surrounding fields. The fence shall be constructed with calcium plastic plates, asbestos tiles or other materials to prevent escape. The wall height is 0.5--0.6m, buried in soil 0.1m, and slightly tilted to the inside of the field, the inside of the field should be smooth, no support Things. The corner of the escape prevention wall is rounded. The inlet and outlet ports shall be sealed with polyethylene mesh, and a bamboo fence shall be built on the outside. The mesh shall be covered to prevent the crab from escaping from the inlet and outlet.
Second, the white planting
1. Apply base fertilizer. Before planting eucalyptus, the plots should be ploughed, exposed to sunlight and soaked in water. Then, 500--800 kg of organic fertilizer should be cooked per 667 square meters, and 40 kg of superphosphate should be used as base fertilizer (uniformly applied to the soil surface).
2. White varieties selection. There are many white plague varieties, and good varieties with high yield, strong resistance and early maturity should be selected according to local conditions and suitable for planting in deep paddy fields.
3. White transplanting. General requirements in the first half of April for transplanting, between the white line 1m, spacing 0.6m, transplanted every 667 square meters 1000 - 1200.
Third, the proper cultivation of aquatic fishermen are: "crab size, see plants, crabs, see plants." This shows the importance of aquatic grasses for raising crabs. At present, most plants are planted with hardgrass. For every area of ​​667 square meters, 30--50 grams of Vallisneria seeds are used. The method of cultivation of Vallisneria seedlings is similar to that of rice mulching. When the grass grows to about 10cm, it is planted in the field using the rice “casting method†and the crabs can be placed until they reach a length of about 30cm.
Four, juvenile crabs in stocking larvae after the survival of white crabs can be stocked, the juvenile crabs stocking specifications to 40--60 / kg is good, stocking 20--30kg per 667 square meters, can also be stocking specifications for 100- -200 animals/kg, stocking 10 to 15 kg per 667 square meters. The stocking young crabs require uniform body color, neat specifications, robust physique, and no disease or injury. In addition, in order to allow the crabs to feed enough of the food after they have landed in the field, 150 to 200 kg of freshly treated snails are disinfected every 667 square meters before and after Ching Ming. Tiangou added some araceae, duckweed and so on.
V. Field Management
1. Feed the bait. Feeding or restocking should be done with "four settings" (fixed, regular, quantitative, qualitative). In May-June, the young snails that lived with live snails before and after Ching Ming were the main species; from July to September, besides the squash, wheat, soybeans, and other plant foods, fish, shrimp, and pigs should be supplemented in a timely manner. Blood, silkworm cocoons, snails, clams and other animal foods to meet the nutritional needs of crab growth.
2. Water quality regulation. The growth and development of crabs requires very strict water quality. Therefore, attention must be paid to observing changes in water quality and weather changes at any time, and timely regulating water quality and water levels. Normally, the water depth in the field should be 0.2--0.3m, and the water depth in the ditch should be 1m. In the hot season, it is necessary to insist on changing the water frequently. Generally, the water is changed every 2 to 3 days. Each time the water is changed by about 0.2m, the water quality is not greasy, but it is not light. When changing the water, avoid using a piece of water to fill the fields.
3. Adhere to daily field inspections. Pay attention to preventing escape, leaking, poisoning and preventing snakes and rats from harm.
4. Disease Prevention and Control of Crab, Crab, Pak. White crabs in the field can reduce the occurrence of pests and diseases, and generally do not require the use of pesticides. Even if pests and diseases occur, biological control should be used as far as possible, with no or little use of pesticides. It is strictly prohibited to use pesticides such as buprofezin, methamidophos, omethoate, 1605, carbofuran, pyrethroids, and imidacloprid. The application must be done after sunny dew. Change the high-concentration spray to a low-concentration spray and use a nozzle with a 0.7mm hole diameter. At the same time, the drug should be sprayed as far as possible on the upper middle of the plant to reduce the liquid falling into the water. In case of improper application of pesticides, pesticide concentration is too high, should be quickly filled with "Happy Valley" to ease the phytotoxicity.
Six, pick crabs generally start crabbing in the middle and late September. The methods of catching include catching crabs in the water, catching them by hand in the night, and trapping them. After the crabs are caught, they must be sold in time.
Wang Shulin (Yifeng Town Fisheries Station, Yandu County, Jiangsu Province, China Postcode: 224022, Tel: 0515-8663986)
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