Design of trenching in Rice Field for Shrimp Culture in Rice Field

Have you ever heard of raising shrimp in rice fields? When it comes to this kind of farming, many people may find it incredible. In the past, paddy fields were generally only used by people to grow rice, but with the development of the times, more and more farmers began to learn to make comprehensive use of resources and cultivate rice at the same time. Hurry up and follow the editor to get to know it.

Design of trenching in Rice Field for Shrimp Culture

1. Rice field selection

Select low-set paddy fields with sufficient water source, strong soil water and fertilizer conservation capacity, not affected by drought and flood, no pollution around, good water quality, convenient drainage and irrigation, and sufficient sunshine, and the paddy field area is convenient for management and feeding. Generally, 40-50 mu is a suitable planting and breeding unit. For the first time, it is suggested that the rice field with ready-made ditch system should be used to reduce the construction cost of shrimp culture.

Facility transformation

2. Dig shrimp ditch

A circular ditch was excavated in a culture unit, which was 1.5-2 meters from the ridge of the field. The width of the ditch was 2-3 meters, the depth of the ditch was 1-1.5 meters, the width of the outer ridge was about 2 meters, and the slope ratio was 1Rd 2.5. In order to facilitate shallow irrigation, drying, application of chemical fertilizers, pesticides and fishing in rice fields, shrimp ditches and shrimp ponds must be dug in shrimp rice fields.

The shrimp ditch in the field can be excavated after transplanting seedlings, and the method of excavation should depend on the shape, area and direction of the drainage outlet of the field. If the paddy field is small, it can be opened into a "field" shape; if it is a long and large field, it can be opened into an inner "well" or an inner "field" shape, with a width of 0.5-1.0 m and a depth of 0.3-0.4 m. The shrimp pond can be opened at the intersection of the shrimp ditch or at the four corners of the field, communicating with the shrimp ditch. Shrimp ponds are generally 1.0 meters square and 0.8-1.0 meters deep.

3. Reinforce the ridges of the fields

The soil excavated in the annular ditch can be built on the periphery of the construction ridge and tamped, heightened, widened and strengthened to ensure that the ridge is 0.6-0.8 meters above the field surface, and the top width is about 2 meters. Melons, beans, gourds and so on can be planted on the ridge, waiting for the vines to be on the shelves. It plays a role of shade and summer shelter in the hot summer. When digging shrimp ditches, small ridges can be left in the field to provide enough places for shrimp to dig holes.

4. Set up escape prevention facilities

The shrimp culture in the paddy field should have a good inlet and drainage outlet, and its location should be on the ridge opposite to the two corners of the paddy field, so as to facilitate the smooth influent and drainage of the whole paddy field. Install barbed wire or double-layer dense net (about 20 mesh) at the inlet and drain, and set a fence on the ridge, 40-50 cm high, which can be used together with hard calcium plastic plate or nylon mesh and hard plastic film or asbestos tile as fence material; the corner of the field is set into a circular arc to avoid escaping shrimp and adult shrimp to control the entry of natural enemies.

Techniques of raising Shrimp in Paddy Field

1. Select the field and open the shrimp ditch.

The paddy fields where prawns are cultured require fresh water quality and stable water level. For this reason, a field with good soil quality, which is close to the source of water, with convenient access and drainage, can be dug at one end of the field with a width of 2 meters and a depth of 1 meter or a shrimp ditch with a width of 1 meter and a depth of 0.8 meters around and in the middle of the field. Build into the drainage system, pour good water, and strictly prevent the mixing of wild fish.

2. Sowing seeds at the right time to improve the survival rate

The young shrimps are released a week after the seedlings are planted, usually using the young shrimps artificially cultivated in the same year, with a specification of 2000-5000 / kg and 10-15000 per mu. Choose the morning stocking on rainy or sunny days, and release it at different points, so that there are young shrimps in the whole water area, so as to avoid excessive concentration of young shrimps and death caused by hypoxia. The action should be agile during stocking in order to improve the survival rate of young shrimp.

3. Scientific baiting and strengthening management

Young shrimp immediately after feeding, generally can be fed with wheat bran, bean cake, or fish (shrimp) with pellet bait, but also should be properly fed with some snails, shellfish, fish and other animal bait. Feed twice a day, mainly in the evening, the daily feeding amount can be controlled according to 2% of the body weight of prawns, according to the season, weather and eating conditions of shrimp, reasonable adjustment, so that shrimp eat well, promote growth.

Selection technique of parent lobster

Parent shrimp refers to the sexually mature male and female shrimp used to reproduce shrimp seedlings, the quality of parent shrimp directly affects the quality of shrimp seedlings, so the selection of parent shrimp is particularly important, here we simply understand the selection technology of parent shrimp. Parent shrimp can be selected in September-October of last year or March-April of the same year, with a body weight of 30-50g, complete appendages, health and disease-free, strong activity, and a female-to-male ratio of 2-3:1.

Crayfish feed formula

1. Young shrimp

1. Formula 1: wheat bran 37%, fish meal 35%, peanut cake 25%, clam shell powder 3%. The protein content of this formula is about 45%.

2. Formula 2: fish meal 60%, wheat bran 22%, peanut cake 15%, minerals 3% and trace elements. The crude protein content of this formula is about 50%.

Second, adult shrimp

1. Formula 1: wheat bran 50%, silkworm chrysalis 30%, bean cake 10%, rice bran 5%, peanut cake 5%.

2. Formula 2: wheat bran 30%, rice bran 22.5%, fish meal 20%, peanut cake 20%, silkworm pupa 7.5%.

The mode of raising shrimp in paddy field refers to the reasonable stocking of a certain number of crayfish through certain transformation in paddy field. This can not only achieve the goal of double farming in one field and more harvest in one season, but also bring considerable economic benefits to farmers.