Can fungicides be used in shrimp-rice continuous cropping fields?

e was required to

When raising crayfish in rice fields, should shrimp-rice continuous cropping rice be harvested mechanically or manually? good?

Harvesting requires manual labor. If you use a machine, the crayfish will be pressed into the mud and become stuck.

When crayfish are raised in rice fields, shrimp and rice are continuously cropped, and after the middle rice is harvested, is it better to transplant or toss the rice next year?

Don’t

Rice and shrimp cultivation technology

Rice and shrimp cultivation technology:

1. Rice field environmental conditions

< p> Shrimp farming rice fields should be in a good ecological environment, far away from pollution sources, free of sand and soil, and have good water retention properties. The water source is sufficient, drainage and irrigation are convenient, and it is not flooded. There is no limit to the size of the area, but 50 acres is generally appropriate.

2. Rice field transformation

1. Trenching

Excavate a circular trench along the outer edge of the rice field ridge 7m-8m into the rice field. The trench is 2m excavated, the trench width is 3m-4m, and the trench depth is 1m-1.5m. If the rice field area reaches 100 acres, a "ten"-shaped field trench must be dug in the middle of the field, with a trench width of 1m-2m and a trench depth of 0.8m.

2. Building ridges

Use the soil excavated from the annular trench to reinforce, heighten and widen the ridges. When reinforcing field ridges, each layer of soil added must be tamped to prevent water seepage or storms from causing the ridges to collapse. The field ridge should be 0.6m-0.8m higher than the field surface, the ridge width should be 5-6m, and the top width should be 2m-3m.

3. Escape prevention facilities

Anti-escape nets should be set up at the drainage outlets and field ridges of rice fields. The anti-escape net at the drainage outlet should be a mesh with 8 holes/cm (equivalent to 20 mesh). The anti-escape net on the field ridge should be made of cement tiles, and the height of the anti-escape net should be 40cm.

4. Inlet and drainage facilities

The inlet and outlet are located at both ends of the rice field. The water inlet channel is built on the ridge at one end of the rice field. The water inlet is filtered with a 20-mesh long mesh bag. Enter water to prevent harmful organisms from entering with the water flow. The drainage outlet is built at the lower part of the circular ditch at the other end of the rice field. Follow the pattern of high irrigation and low drainage to ensure that water can be poured in and drained out.

3. Transplanting plants and placing beneficial organisms

After disinfecting the shrimp ditch for 3-5 days, transplant aquatic plants in the ditch, such as Hydrilla verticillata, Echinacea purpurea, and For peanuts, etc., the planting area is controlled at about 10%. Before and after the shrimp seeds are released, some beneficial organisms are released into the ditch, such as water earthworms (0.3-0.5 kg/㎡), field snails (8-10 pieces/㎡), river mussels (3-4 pieces/㎡), etc. It can not only purify water quality, but also provide rich natural bait for crayfish.

4. Stocking management

1. Broodstock breeding mode

From the end of August to September for the first time of breeding, go into the circular ditch and field ditch of the rice field. When broodstock is released, 20kg-30kg per mu is added, and 5-10kg per mu is used in raised rice fields. Before the broodstock is released, 40%-60% of the area of ??the ring ditch and field ditch should be transplanted with floating plants. Broodstock should be selected from farms or natural waters with strong constitution, no disease or injury, and good color. The selected broodstock should be packed by male and female in plastic shrimp baskets of different colors. A layer of aquatic plants should be placed on each basket to keep it moist. , avoid direct sunlight, and the transportation time should not exceed 10 hours. The shorter the transportation time, the better. Broodstock are stocked at a female to male ratio of 2-3:1. When placing, the shrimp basket is repeatedly immersed in the water 2-3 times for 1-2 minutes each time to allow the broodstock to adapt to the water temperature, and then placed in the ring ditch and field ditch.

There are two models for releasing young shrimps. One is to release artificially propagated shrimp seedlings from September to October. About 15,000 shrimp seedlings with a size of 2-3cm are released per acre. The second is to release artificially cultivated juvenile shrimps from April to May. About 10,000 juvenile shrimps with a size of 3-4cm are released per acre.

5. Feeding and management

1. Feeding

In addition to feeding on organic debris, zooplankton, and aquatic insects in the rice fields, the broodstock released at the end of August In addition to natural baits such as wormwood, pericans and aquatic plants, it is advisable to feed a small amount of animal feed, with the daily feeding amount being 1% of the total weight of the broodstock. It is advisable to add aquatic plants once a month before December, and the dosage of aquatic plants is 150kg/acre.

Animal feed should be fed once a week in the shallow water of the platform beside the field ridge. The feeding amount is generally 2%-5% of the total weight of the shrimp. The specific feeding amount should be adjusted according to the climate and the feeding situation of the shrimp.

When the water temperature is lower than 12℃, feeding is not required. In March of the following year, when the water temperature rises above 16°C, aquatic plants are added twice a month at a dosage of 100kg/mu-150kg/mu, and animal feed is fed once a week at a dosage of 0.5kg/mu-1.0kg/ mu. Artificial feed should also be fed once every evening, and the feeding amount is 1%-4% of the weight of shrimp stored in the rice field. Available feeds include cake meal, bran, rice bran, bean dregs, etc.

2. Fertilization

Apply sufficient base fertilizer before placing broodstock or shrimp seedlings, and apply 100-200kg/acre of decomposed farmyard manure (pig, cow, chicken manure) at one time. The dosage of topdressing decomposed farmyard manure is 50kg/mu-100kg/mu. Special fertilizer for shrimp and crabs with enzyme bacteria can be used throughout the whole process of crayfish farming in rice fields. Application...

Can pesticides be sprayed on rice and shrimp continuous cropping fields

No

How much is the subsidy for rice and shrimp continuous cropping per acre in Anqing City, Anhui Province< /p>

More than 500 yuan

What is the huge business opportunity behind lobster

For ordinary merchants, crayfish are currently very popular:

1. For catering businesses, the development of crayfish can bring good economic benefits.

① Expand the sales area of ??crayfish through takeout and online shopping, transcending time and space limitations.

② With the popularity of crayfish, derivative products such as crayfish-filled fried buns and moon cakes can be developed and produced sustainably.

2. For a place, the development of crayfish can drive upstream and downstream enterprises and the overall economic development.

Take Qianjiang, Hubei Province as an example:

1. Achieve industrial upgrading: Qianjiang wants to be the "Chitin Capital of the World"

According to statistics, crayfish processing Later, about 80% of shrimp shells became waste. Qianjiang City produced more than 100,000 tons of discarded shrimp shells every year. These wastes were often placed in a row, which not only wasted resources, polluted the environment, and easily caused conflicts with surrounding people. conflicts and disputes. These discarded shrimp shells contain a large amount of chitin, which provides a large amount of resources for Qianjiang crayfish processing to turn waste into treasure, transform and develop the industry, and extend the industrial chain.

2. Achieve added value to the tourism industry: the annual Qianjiang Lobster Festival detonates rural tourism

Since 2004, Qianjiang City has held two China (Qianjiang) Cao Yu Culture Zhou He hosted the third China Hubei Qianjiang Crayfish Festival, hosted the International Chitin Symposium, and carried back the golden sign of "China's Hometown of Crayfish". With the help of the festival, the city's business card of "Cao Yu's hometown, waterside garden, and lobster hometown" is famous all over the world, and the popularity and influence of Qianjiang City continue to expand.

3. Vigorously develop derivative products: the "shrimp-rice continuous cropping" model makes the rice produced green and safe

On December 9, 2012, the 11th China High-Quality Rice Expo and Trade The expo ended in Huai'an, Jiangsu. The "Xiaxiangdao Brand Ecological Fragrant Rice" presented by Qianjiang City won the "Gold Medal Rice" award. The expo was sponsored by the Ministry of Agriculture, and 318 companies and units selected their products. Participating in the exhibition, Qianjiang City Xixiangdao brand ecological fragrant rice is an ecological rice produced through the "shrimp-rice continuous cropping" model

If you are interested in crayfish entrepreneurship, you can follow the public account cmcchckj~

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What should you pay attention to when raising lobsters in newly introduced rice fields

There are many enemies that threaten the survival of crayfish in shrimp-rice continuous cropping rice fields, such as water centipedes, frogs, water snakes, eels, loaches, and carnivorous fish ( Such as catfish, loach, mullet), water rats, etc. are all natural enemies of crayfish. Therefore, drugs (such as quicklime) must be used to completely eliminate the above enemies before stocking the crayfish. Do not use 20-- at the water inlet. 40-mesh gauze should be used for filtration, and the drainage outlet should also be surrounded by dense mesh to prevent the invasion of enemies. Frequent inspections should be carried out to remove harmful organisms in the field in a timely manner. If conditions permit, some scarecrows and colorful strips can be set up on the edge of the field to intimidate and prevent pests from entering. Drive away waterfowl.

How many kilograms of lobster can be produced in one acre of mixed rice and lobster culture?

Generally speaking, there are two modes: one is rice and shrimp continuous cropping, that is, planting rice first, The latter is shrimp farming, with a yield of 50-100 kilograms per mu; the second is rice and shrimp farming. There are lobsters in the rice fields all year round, and the annual yield per mu can reach 150-200 kilograms.

Shrimp farming in rice fields requires trenches to be dug in the rice fields to facilitate the release of water during rice harvesting and paddy farming, and to reduce spraying. It is recommended to purchase relevant books to understand detailed techniques.

The picture below is an example. Due to changes in market prices, the benefits are for reference only.

Can lobsters be cultured in rice fields?

Can lobsters be cultured in rice fields?

Reason:

The yield of freshwater lobster raised in rice fields can generally reach 400 to 500 kilograms per mu, and can reach 800 kilograms at high yields. Raising shrimp in rice fields can eat weeds and other aquatic organisms that consume fertilizer in the fields. It not only saves the labor of weeding, but also eliminates mosquitoes and flies that harm people and livestock. Moreover, shrimps are constantly moving and foraging in the rice fields, which not only helps the rice fields to loosen soil, provide running water, and ventilate the rice fields, but also increases the dissolved oxygen in the field water. At the same time, they excrete a large amount of feces through metabolism, which has the effect of maintaining and increasing fertilizers.

The main modes of crayfish farming in rice fields are:

First, continuous cropping of rice and shrimp: Continuous cropping of rice and shrimp refers to planting one season of rice in the rice field and then raising one crop of crayfish, and so on. For continuous cropping of rice and shrimp, it is best to choose mid-rice varieties. The transplanting season of mid-rice is later than that of early rice, which is beneficial to harvesting larger and more crayfish before the rice is transplanted next year. The late rice harvesting season is late, so it is not necessary to release seed shrimp after harvesting the rice. At this time, the seed shrimp has passed its optimal breeding period.

The second is rice and shrimp farming: Rice and shrimp farming uses the shallow water environment of the rice field, supplemented by artificial measures, to grow rice and raise shrimp to improve the economic benefits per unit area of ??the rice field. Since crayfish do not have high requirements for water quality and breeding site conditions, and many areas in my country have the tradition of raising fish in rice fields, when the benefits of rice planting are limited, promoting rice and shrimp farming can effectively increase the productivity of rice fields per unit area. Economic benefits. The rice and shrimp growth model can choose early, middle or late rice, but only one season of rice is planted a year, and the rice varieties must be lodging-resistant varieties. It is best to use the no-till and throwing method when transplanting rice seedlings.

Raising crayfish in rice fields can eliminate weeds and pests, reducing the need for chemical fertilizers and pesticides. Generally, rice shrimp growth can increase rice yield by 5-10%. In August-September, 20 kilograms/acre of seed shrimp or 30 kilograms/acre of 3-4 cm juvenile shrimps are planted in March-April. During the rice growth period, the yield of crayfish can be increased by about 50 kilograms/acre. Continuous shrimp farming under certain conditions can increase shrimp production by 100 kilograms/mu, and the maximum shrimp production in a year is about 150 kilograms/mu. The third is rice-shrimp rotation: Rice-shrimp rotation uses the water body of the rice field to plant one season of rice, and after the rice is harvested, crayfish are cultured. No rice is planted in the second year, and one season of rice is planted in the third year. The cycle continues every three years. Rice-shrimp rotation can maintain the ecological environment of shrimp farming in rice fields, so that shrimps have sufficient nutrients, reduce shrimp pathogen populations, and at the same time allow crayfish to have a longer growth period, which can produce larger-sized high-quality commercial shrimps and improve the quality of shrimps. The grade and price of commercial shrimp increase the economic benefits of shrimp farming.