Rice field crab culture

Rice fields raise crabs, rice and crab symbiosis, and many benefits. Crab can remove weeds in rice fields, eat some pests and promote rice growth. Rice fields provide a good environment for river crab growth and promote the growth of river crabs. Raising crabs in rice fields can improve the economic benefits of rice cultivation and increase farmers' enthusiasm for growing grain. The paddy field in China is vast, and the development of paddy field crabs is also an important aspect. Let’s take a look at rice farming crab technology.

1. Selecting the field and doing a good job in raising crab facilities. The paddy field for raising crabs requires the selection of fields close to the water source, good water quality, clay quality and good water retention performance. The area is 3-4 mu. The excavation of the rice crab crab ditch can refer to the paddy field for fish farming. The ditch is 1.5-2 m wide and the ditch is 1 m deep, showing a "field" shape. The paddy field is surrounded by calcium-plastic panels or other materials to prevent the escape wall, and the inlet and outlet systems are built. The inlet and outlet ports should be sealed with polyethylene mesh and covered with nets to prevent the river crabs from escaping from the inlet and outlet. All these facilities must be built before the crabs are stocked.

2. Planting rice, stocking crabs in a timely manner, and paddy fields for raising crabs, it is advisable to use high-yielding rice varieties that are resistant to strong fertility, hard in straw, not easy to fall, and resistant to disease, using wide-line dense planting, and appropriately increasing the planting of the field. Density, exerting marginal advantages and increasing rice yield.

The stocking specifications of crab species are 40-60 per kilogram, 20-30kg per mu, or 100-200 per kilogram, 10-15kg per acre, and can meet the market specifications in the same year: young Crabs require neat specifications, complete limbs, and strong physical fitness to increase the survival rate of stocking.

3, the feeding management of rice paddy crabs, the regulation of the feeding method of the water quality rice paddy crabs, the annual feeding amount, the daily feeding amount, the feeding times, all can refer to the pond crab raising method for planning layout and organization and implementation. . In order to add some green duckweed, duckweed, etc. in the paddy field, in addition to feeding plant-based bait such as pumpkin, wheat, and soybean, from July to September, some small fish, shrimp, pig blood, silkworm cocoon must be planned. Animal bait such as snails and scorpions to meet the needs of river crab growth.

Paddy fields raised in rice fields should be kept at a water depth of 20-30 cm, and the water depth of the crab ditch is 1 m. The water quality is required to be fresh and the dissolved oxygen is abundant. In the hot season, it is necessary to change the water frequently, usually every 2-3 days, every time you change the water by about 20cm.

The rice fields are shallow and shallow, and the river crabs often cause water leakage in the fields, which is easy to cause escape. Therefore, we must attach great importance to the anti-escape work of rice-raising crabs, often check and repair anti-escape facilities, plug the loopholes in the fields, prevent storms from escaping across the anti-escape facilities and the fields, flooding the fields, etc., and prevent the pesticides and fertilizers from being water quality. Pollution, take effective measures to eliminate water snakes, water mice and other enemies.

River crabs are very sensitive to the reaction of fertilizers and pesticides. It is best to use crabs in paddy fields. If you want to use them, you should choose high-efficiency and low-toxic pesticides. When using the medicine, first fill the field water, change the liquid to spray, change the high concentration to low concentration spray, minimize the impact on the river crab, fertilize the rice field, it is best to apply the base fertilizer, and the top dressing should also use organic fertilizer. Lord, the use of chemical fertilizers should pay great attention to the impact on river crabs, so as to increase the production of rice and crab.

4, timely harvest, rice paddy crabs caught in the middle and late September, the methods of capture are water and crabs, freehand capture and trapping at night. River crabs should be sold or kept in time after harvest. If the crab species raised in rice fields are selected, the ponds with deeper ponds and better water quality conditions will be used as wintering ponds for holding or wintering, and will be used for the development of crabs for crab farming in the coming year.

 

Precautions in the process of raising crabs in rice fields

1) Qingtian disinfection, the completion of the field repair, 30 to 35 kilograms of quicklime per acre into a lotion, the whole field splashed to kill the enemy and germs, add calcium.

2) For rice transplanting, planting with wide rows of dense plants should be carried out to increase the planting density around the ditch, which can exert its marginal advantages, increase yield, and prevent collapse of the ditch wall.

3) The crab species are stocked at the right time. After 7-10 days of rice transplanting, the crabs of the same size are selected, and 300 to 500 mu are placed.

4) Fertilization in paddy fields is dominated by organic fertilizers. Under the premise of applying base fertilizer, it is usually best to use topping for cakes. Reduce the number of top dressings as much as possible, especially to reduce the number and quantity of fertilizers. When it is determined that chemical fertilizers are needed for topdressing, urea should be used, and ammonium bicarbonate should not be used. The amount per mu is controlled within 7.5 to 10 kg.

5) The paddy field in the paddy field should be kept at a depth of 3 to 5 cm, without changing the water level or dehydration. If it is necessary to dry the field, the water level can only be lowered to the surface of the water, and the light can be used in several places to prevent the water from being too small to affect the growth of the crab.

6) Disease control River crabs are more toxic to pesticides than fish. Therefore, crabs in rice fields must be strictly controlled to use pesticides that are highly toxic to river crabs.

The above is the rice field crab technology for your reference, and I hope to help you. Huinong School has more relevant agricultural technology knowledge. Continue to pay attention to Huinong School to answer questions during planting or breeding.

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