(1) Field selection and requirements The selection of fields with good water retention performance, low-lying terrain and convenient drainage and drainage. Dig out the ring ditch 3 to 5 meters away from the field inside the block, 5 to 8 meters wide and 1 to 1.2 meters deep. The large fields dig in the field the “+†or “well†shape, a 0.5-meter-wide, 0.6-meter-thick field ditch that connects with the surrounding ring and ditch. The excavated soil is used to increase the height of the field ridge, so that no water seepage occurs. Leaking water, at the same time in the field ridge with asbestos and other materials to build 0.6 meters high anti-escape wall, set up separate inlet and outlet.
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(B) Intercropping wheat crabs After capturing, dry the water on the field surface and use no-tillage methods to sow wheat. Use 7.5 kg per mu. A space is left in the middle of the wheat ridge, and the watermelon pods will be transplanted later. Wheat management is generally not fertilized (due to post-culture fecal baits, soil fertility than full), without pesticides (if medication, low toxicity, low residual biopesticides), wheat harvested in early June.
(C) intercropping watermelon selection of early-maturing watermelon varieties. Starting in mid-April, another field of germination and nursery will be carried out. In early May, the melon plant will be transplanted to the wheat ridge and covered with a plastic film to cover the heat and moisturizing. Beforehand, 1000 to 2000 kg of manure will be applied per mu, or 100 kg of cooked cake and 150 kg of superphosphate. As a basal fertilizer, combined with arranging wolfberry and then applied 15 kg NPK compound compound fertilizer, the density of planting varies depending on the cultivation method and the pruning method, and the general spacing is 220 cm and the plant spacing is 50-60 cm. Harvest the watermelon before and after July.
(d) Stocking of shrimps and crabs
In March, the mud in the ditch was removed, and the bottom was frozen for half a month. The water was filtered and injected into the river with a dense mesh bag, and then disinfected with quick lime and tea seed cake. At this time, the water in the ditch is maintained at a depth of about 0.8 meters. At the same time, the water peanut community is transplanted, and 150 kilograms of fresh snails are placed per acre. A plastic film is used to form a protective wall along the outside of the ditch. The bottom part is 0.5 meters and the upper part is 0.2 meters. Prevent the crabs from crawling into the wheat field and dry and die. In early May, stocks of about 2,000 “bean crabs†per kilogram will be stocked, 800 to 1,000 per mu. Shrimp can be placed before and after the release of crab species per acre holding egg 0.75 to 1 kg, can also be in the field after the water (in mid-July) into the breeding shrimp seedlings, put 2 to 30,000 per acre.
(v) Feeding management When shrimps and crabs are stocked in the ditch, they are fed 1 to 2 times a day and are fed mainly in the evening. One week after entering Daejeon, normal feeding on the fields is started.
The bait varieties include fresh and small fish, snail meat, pig blood, wheat bran, wheat flakes, pumpkin, and potatoes. In the mid-term, meat-based feed accounted for 40%, and plant-based feed accounted for 60%. The proportion of pre-harvest and pre-harvest was the opposite, with meat-based feed as the mainstay. The amount of daily feeding is controlled at 7% to 9% of the total weight of shrimps and crabs in Tanaka. It adheres to timing, positioning, quality, and quantitative feeding. During the breeding period, attention should be paid to water quality regulation to maintain the water quality to meet the requirements of fertilizer, live, tender and cool. The water level is gradually deepened, reaching about 0.7 meters in the later period. Every 15 to 20 days, 1 lime is sprayed throughout the field, 10 to 15 kilograms per acre, which plays a role in preventing disease and increasing calcium.
(6) Shrimp and crabs will be collected from the end of September. They will be caught by hand and caught in cages. Captured crabs can be divided into specifications, and male and female crabs can be kept in the ditch or in the river. Here, sell when the price is right. Green shrimp can be concentrated in the ditch, from late November to the following year, from March to March, water catching, cage trapping, and copying, fishing, and other methods of fishing and listing.
Author: No.41, Jianmin Lane, Nanmen Street, Liaozhong County, Liaoning Province