River crab is the preferred species for rice field crab farming, is there anything special about it?

1. Rice fields can be river crabs.

The growth provides a good ecological environment. Paddy fields generally have soft soil, sufficient dissolved oxygen, suitable water temperature, and abundant nutrients.

2. Rice fields can provide abundant bait organisms for the growth and development of river crabs.

Rice field breeding river crab is to use the ecological environment of rice field, supplemented by man-made engineering measures, not only to plant rice, but also to breed river crabs, make full use of natural resources, fully tap the production potential of rice fields, and achieve the purpose of double income of rice and crabs.

First, the selection of crab farming paddy fields.

Fields with sufficient water sources, convenient drainage, pollution-free water quality, convenient transportation and strong water retention capacity should be selected, and water should not be discharged in the field. Generally, medium and low-yield fields can be selected for rice crab farming, and the increase in yield and efficiency is more obvious.

Second, the construction of the rice crab project.

The field project of crab farming in paddy fields should be rationally designed and scientifically constructed in accordance with the requirements of ecological and environmental conditions such as the symbiosis of crabs and rice. The main thing is to dig a set of crab ditches, strengthen and strengthen the surrounding fields.

3. Construction of anti-escape facilities.

Using agricultural plastic film, using small stumps as piles, five every one meter, laying along the rice field, fixed with iron wire, supported by wooden piles, usually with double-layer plastic film, practice has proved that this kind of anti-escape wall is more durable, low-cost, easy to repair and reinforce.

When raising crabs, the management of rice fields is also very noteworthy, and the crabs raised in rice fields will taste more delicious if they are better cultivated, and the meat quality of hairy crabs will be very delicate.

Rice fields for breeding adult crabs should generally be selected close to the water source, the water quality is fresh and pollution-free, the drainage and irrigation are convenient, and the water retention performance is good.

The area of the paddy field is 3 10 acres is appropriate, the selected field should have sufficient water source, injection and drainage method, no water leakage, good water retention performance put the crab seedlings directly into the middle ditch of the rice field after returning to green, the method of crab seed cultivation is divided into ponds and graded stocking, and gradually expand the volume, until it reaches the density of breeding warfare and cultivation. The crabs that are directly monopolized and bred into crabs are also being put directly into the ditch at the edge of the rice field after the rice returns to green.

Crab farming in rice fields can better decompose most of the excrement, crab excrement can lead to the growth of rice seedlings, and to the flower can be fertilized, so as to make better use of the ecological environment, so as to protect nature.

Now rice field crab farming is an important model of mutual benefit and win-win, the crabs raised in the rice field can eat the pests in the rice field to avoid insect pests, and the feces discharged by the crabs can also become the nutrition of the rice field**.

Rice crab farming will make the crab meat more tender, but also can save a lot of artificial breeding power, they can be completely self-reliant, and then there is to loosen the soil, will also be conducive to the growth of rice seedlings, the two are mutually beneficial and win-win.

Because this is a double harvest situation, when the crab grows up, your rice will also be harvested, and the crab is raised in the rice field, and there is no need to feed it

The rice crab is a Chinese mitten crab, which is what we call a hairy crab, and he likes to live in a relatively light water environment.

Point 1: This kind of crab is basically a kind of crab that grows in the rice field, and the habit of life is actually very regular, and the one they eat is the insect in the rice field.

It is not surprising that Sichuan can raise hairy crabs. Germany has a headache for the crazy reproduction of hairy crabs, which shows that hairy crabs are very adaptable and fecund. High and strong market, reproduction and adaptability, fresh meat, rich nutrition have made hairy crabs set off a breeding boom in recent years.

In fact, the paddy field fertilization model was successful as early as the Liaoning experiment. From the perspective of latitude, it is easier for crabs to introduce Sichuan than to introduce Liaoning.

The water source of the field crabs in Jiping Village is taken from the natural spring water on the mountain at an altitude of 1,200 meters, and the natural pure water quality unique to the sky is obtained, and the pH is around the limit, which is the best range for the growth of hairy crabs. In addition, the growth of hairy crabs has special requirements for water quality (low salt, low ammonia nitrogen, low hydrogen sulfide). With the application of pesticides and fertilizers, the salt and ammonia nitrogen content in the water has increased sharply, and hairy crabs are bound to suffer from extinction.

Ecologically grown rice fields do not apply any pesticides and fertilizers, which provides this demand for hairy crabs. The problem of low yield and low efficiency of ecologically grown rice can also be filled by selling hairy crabs.

In order to improve economic benefits and share the risks of seed farming, the polyculture model of rice, fish and crab was further introduced in Ziping Village. After harvesting the rice, crucian carp began to be sold, and it was the golden autumn crab fat period when crucian carp was sold out. In addition to good water quality, the water temperature has a great impact on the juvenile crabs, the growth temperature of hairy crabs is 15 30, and the suitable temperature is 22 25.

Otherwise, the survival rate is very low, and it will be much better when you grow up. The yield of crabs per mu in rice fields is more than 450 kilograms, and the yield of crabs is 10 kilograms. Crab paddy fields should choose medium-ripening late japonica rice or hybrid japonica rice paddy fields with sufficient water sources, good water quality, convenient drainage, strong conservation and fertile soil, and it is also possible to have paddy fields that are not dehydrated throughout the year.

It is necessary to raise the ridges around the reinforcement of the cover farmer, the ridge is 66 cm high, the soil is compacted, and there is no leakage.

Rice varieties Yiyou 63, Nanyou 6, Luyou 1, Sterile Bonika 3, Yanzi Bonika 187, Yanzi Bonika 235 and so on. On the application of base fertilizer, farmers should apply sufficient base fertilizer before transplanting seedlings, and organic fertilizer varieties are better. Rice cake fertilizer is good, the aging is long, and the effect is good.

Generally, radish can be supplemented with inorganic fertilizer in areas with 250 500 kg of human manure, 150 200 kg of rice cake fertilizer, and insufficient organic fertilizer, and the total amount of use is basically an appropriate choice to ensure the growth of rice throughout the growth period. 2 to 3 days before transplanting seedlings in the seedling field, apply a high-efficiency pesticide to the seedlings to prevent the spread and spread of rice diseases and pests. Shallow water is usually transplanted and planted in Mizhou, giving full play to the marginal advantage and increasing rice yield.

Within a week after seedling, especially before the seedlings return to greenery, the seedlings should be minimized so that the survival of the seedlings will not be affected.

It is because this method can increase income, create a better living environment for each other, and also improve the income of farmers, which is a matter of killing two birds with one stone.

The development of crab farming in paddy fields has greatly increased the peasants' enthusiasm for farming and is conducive to stabilizing grain production. While producing commercial crabs, all localities generally do not affect the grain output of paddy fields, which not only plays a positive role in stabilizing the grain planting area and grain output, but also ensures the smooth completion of the peasants' rations and the national grain purchase task.

I think the main reason is that crabs can remove weeds from the rice fields, and they can also catch insects in the rice fields, which is conducive to the growth of crops in the rice fields.

Summary. First of all, the rice field itself is a single paddy field cultivation method, and the crop is a single rice. In addition to a single rice, there are also crab roe, which is conducive to the harmony of the biological chain.

The Shouwu Yingxian Rice Farm itself is a single paddy field cultivation Fang Songqin style, and the crop is a single rice. The mixed planting and breeding mode of rice field crab farming is carried out, and the single rice and crab roe are returned to the cavity, which is conducive to the harmony of the biological chain.

The Shouwu Yingxian Rice Farm itself is a single paddy field cultivation Fang Songqin style, and the crop is a single rice. The mixed planting and breeding mode of rice field crab farming is carried out, and the single rice and crab roe are returned to the cavity, which is conducive to the harmony of the biological chain.

What does that have to do with the type of produce?

The product types have changed from single to diverse.

Before, it was only rice that was harvested, but now it's different.

Is river crab also an agricultural product?

Count as by-products.

1. Preparation of crab farming paddy fields.

Crab farming in rice fields requires escape prevention facilities. The ridge is required to be 60 cm high and 40-50 cm wide, and the ridge can be covered with a double layer of plastic film. Smooth asbestos tiles or polyethylene mesh can also be used around the paddy field to prevent escape.

The inlet and outlet should also be equipped with anti-escape sheds. Dig a ring ditch 3 meters away from the ridge, and the ring ditch for raising crab seedlings and crab seeds is 1 meter wide and 1 meter deep. The grow-out crab ring ditch is 2-3 meters wide and 1 meter deep.

In the middle of the field, ditches should be opened and slipped (crab ponds). The ditch is 50-60 cm wide and 50 cm deep, and grow-out crabs can be widened to 1 m and 60 cm deep. The area is 8-10 square meters and the depth is 1 meter.

Ditches and slips account for about 30 of the total area of paddy fields. It is advisable to raise crab fields with 2-3 acres as a breeding unit.

2. Seed stocking.

Cultivated crab fingerlings are stocked with kilograms of crab seedlings per mu. Adult crabs can be stocked with 1500-2 000 crab species weighing 10-15 grams per mu. You can also use the crab seedlings that are bred early in the year, put them in the greenhouse to strengthen the cultivation, and then put them into the rice field in May, which can shorten the breeding cycle.

3. Crab feeding management.

Feed 1-2 times a day, usually 8-9 a.m. and 4-5 p.m. Specially raised adult crabs are mainly fed in the evening, and the daily feeding rate is 3 -5. The feeding point should be on the pre-set food table or on the shore on both sides of the crab ditch.

When feeding, pay attention to check whether there are loopholes in the ridges, because the river crabs have the habit of punching holes, and the loopholes are blocked in time. Pay attention to waterlogging prevention and crab escape during heavy rains, and pay attention to water shortage in dry seasons. Under normal circumstances, the water depth of the paddy field is maintained at 6-10 cm.

In order to keep the water quality fresh, the water should be changed frequently, and the water can be changed once a week from June to July; Change the water 2-3 times a week from August to September; After September, the water can be changed once every 5-10 days. Water change 1 3-1 5 per time. In addition, during the feeding period, apply quicklime once every 10 days in the ditch and slip to make the water 5-10 milligrams of liters.

With sufficient water and light, it can provide a good growth environment, and the integration of rice ecosystem and aquaculture can maximize the sharing and utilization of resources, and the economic benefits are higher than those of traditional feeding methods. 2.Eco-friendly:

Crab farming in paddy fields can promote the diversification of land cultivation, reduce space waste, reduce pollution from other water aquaculture, maintain ecological balance and enhance sustainable development. It is also equivalent to extending the period of rejuvenation income, killing multiple birds with one stone. 3.

Organic farming: Farming through organic farming can not only ensure the quality of crabs, but also reduce the impact on the environment such as the use of chemical fertilizers, and it is also in line with the mainstream trend of modern people's demand for health-conscious products. Disadvantages of rice field crab farming:

1.Pest control costs can be high: pest breeding is possible due to being in a rice field.

Therefore, it is necessary to prevent the early insect pest from having an unnecessary impact on the later culture, which will increase the cost of crab farming. 2.The production cycle and risk factors are large:

The planting cycle of crab farming in paddy fields is long, the harvest period is ominous, and the spring is easy to control, and at the same time, it is affected by various factors such as species, variety, management, climate, etc., and is also susceptible to unknown natural disasters and other risks. 3.A high technical threshold is required:

Compared with traditional crab farming methods, rice field crab farming requires a higher level of technical level and professional knowledge to resist risks and ensure production efficiency, which may be difficult for beginners to control.

Crab farming in paddy fields is a systematic project with comprehensive benefits in the current agricultural production, which plays an important role in stabilizing grain supply, increasing production and income, guiding farmers to get rich, and revitalizing the rural economy. The advantages are:

1) It is conducive to the growth of rice, does not reduce the yield of rice, and improves the quality and efficiency.

River crabs feed on weeds, green weeds, benthic organisms in the rice field, and a large number of pests such as rice leafhoppers, borers, etc., and their excrement can fertilize the field. This promotes the growth of rice, improves rice yield, adopts large ridge double-row technology in planting, rice planting "a lot of rows, no lack of holes", the use of the marginal effect of rice, rice yield increases by 5% 17%, and it is "organic rice", the price per kilogram increases by yuan, and the cost decreases by more than 10%.

2) Rice fields provide a good habitat for river crabs and promote the growth of river crabs.

The shallow water and shading of the paddy field are conducive to the concealment and molting of river crabs, and there are many bait organisms in shallow water, which is conducive to the growth of river crabs. In the later stage, intensive nutritional measures were adopted: after the fourth molt, animal bait was added, so that the size of river crabs in the paddy field was significantly increased, more than 100 grams of female crabs, more than 150 grams of male crabs, and the quality was improved, and the yield of adult crabs in the paddy field was 25 30 kg.

3) Symbiosis between rice and crabs, and the economic benefits are significantly improved.

Each mu of paddy field can harvest about 400 kg of rice, harvest more than 25 kg of adult crabs, can improve the net benefit of 1000 1500 yuan.

4) The comprehensive benefits are extremely significant.

Rice crab farming closely combines planting with crab farming, which not only improves the utilization rate of land and water resources, but also stabilizes farmers' enthusiasm for growing grain, reduces production costs, reduces the use of chemical fertilizers and pesticides, and improves the quality of river crabs and rice.

5) One water for two purposes, one land for double income, in line with the national food security and sustainable development strategy.

This technology is of great significance for ensuring the stability of China's basic grain fields and ensuring the food security strategy. It not only saves land and water resources, but also symbiosis between rice and crabs, significantly reduces pests and weeds in rice fields, and rice is conducive to the concealment, molting and growth of river crabs, ensuring that the environment of rice fields and wetlands is harmonious and friendly, and becoming a veritable resource-saving, environment-friendly and food-safe industry.