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In the wild, Astragalus inhabits shallow cemented soils because the soil can provide stable warm conditions and a dark living environment. In production, bamboo nests, bricks, and aquatic plants are used instead of soil to meet the living conditions of Astragalus and soilless culture. As far as soil cultivation is concerned, soilless astragalus cultivation has the advantages of low construction cost, convenient observation and management, easy feeding of compound feed, and prevention and control of diseases and insect pests. At present, soilless culture basically adopts aquaculture mode, but in places where water resources are in short supply, the mode of aquaculture without water is difficult to promote. The water-sew-free aquaculture in Huanghua is easier to promote than aquaculture without water. Silent water and soilless farming water-saving section labor, low investment, quick effect, wide range of adaptation, generally after 6 to 7 months of production cycle, can be increased by 3 to 5 times, net income per square meter Dianchi up to 100 ~ 150 yuan. The key technologies for aquaculture without water in Huangshui are briefly described below. Water and grass stocking Reasonably put water plants to purify water quality, and reduce the number of water changes in Dianchi to 1 or 2 times per month, and it can play a role in preventing heatstroke, reducing stress, providing fish nests, and preventing diseases and insect pests. Common water plants include water peanuts, water hyacinths, water lettuces, and fine green tea. In different seasons, it is necessary to use watercress proportionately and reasonably, summer water hyacinths and water lettuces are the main ones, spring and autumn are mainly water peanuts and fine arborvitae, and winter plants are not left to prevent freezing of yellow locusts. In general, plants are released 15 days before stocking. Before disinfecting, 0.01% potassium permanganate solution should be used to sterilize aquatic plants for half an hour. Aquatic planting area should not exceed 2/3 of the total pond area. At least 1/3 of the fish pond area must be vacated to set up the food table and facilitate the treatment of yellow peony. activity. In the daily management, we must remove excess aquatic plants in time or cut long water plants and disinfect the grass with 0.110-6 quicklime in combination with Dianchi disinfection to prevent aquatic grass fungus infection. Fish nests are equipped with a variety of tubes, bamboo tubes, bricks, waste tires, aquatic plants, loofahs, brown chips, and polyethylene nets. In the production, the used bicycle tires are generally better treated by potassium permanganate solution after being sterilized. The tires are placed under the weeds, and 5 to 6 tires can be placed in each small tank. Bamboo can also be used, two bamboos in a row, each pool is set to 3 to 5 rows, each row spacing is about 0.3 meters. Each row of bamboo underlays the bricks, so that there is a larger space under the bamboo nest to facilitate the discharge of sewage. To fix the bamboo nest, it is best to press and put bricks on the top of the hole, which also plays a role in shading and concealing. Summer shade shading waterless Aquaculture ponds are small (15 to 20 square meters), and the water level is shallow (15 to 20 centimeters). In summer, the water temperature can easily exceed 30 degrees Celsius. Therefore, it is essential to shade the pond and shelter from the heat. In general, shady nets are placed on the pool, and climbing plants such as grapes, sponge gourds and pumpkins are planted on the poolside. But pay attention to the surface of the pool to leave 10% to 30% of light. When the temperature exceeds 30°C, it is necessary to deepen the water level in the pool, reduce the density of jaundice, and slowly inject new water (using groundwater to regulate the temperature of the fish pond). Water quality regulation 1. Cross disinfection. The water body is splashed with bleaching powder 0.110-6 or 110-6 lime every 10 to 15 days, and is used crosswise. The northern part of the water quality is somewhat alkaline, and the number of bleaching powders used is less; the southerly water quality is somewhat acidic, and the use of quicklime may be more frequent. 2. Maintain a suitable water level. Astragalus eat and breathe often need to head out of the water, in order to reduce the consumption of body strength, the water level should be shallow. However, the water level is too shallow, the water temperature changes quickly, and the activity space of the Huangqi is small, which is not conducive to the growth and development of the Astragalus. Therefore, the general water level is 10 to 15 cm, and it can be increased to 25 cm when the temperature is high. If the grass grows luxuriantly, you can change the water once a month. Generally, you need to add fresh water according to the amount of water evaporation. 3. Maintain biodiversity. In Dianchi Lake, it is necessary to raise snails, small trash fish, and mud louse to remove residual baits to adjust water quality. However, it should be noted that these organisms should maintain a reasonable proportional relationship in quantity. The stocking loach should be no more than 0.3 kg per square meter. The loach should be stocked after the tadpoles tame the compound feed, so as to fully utilize the loach to eat the feces of jaundice. Stocking crickets has special effects on preventing P. syringae peculiar plum spot disease. Generally, 1 to 2 can be placed in each small pond. The snails stored in a square meter pool should not exceed 0.25 kg. In addition, suitable amounts of green algae and the like can also be cultivated in the pond. Ecological control of pests and diseases 1. Adjust water temperature. The suitable temperature for the growth of Scutellaria baicalensis is 15-28°C, and the optimal feeding temperature is 23-26°C. When the water temperature rises, the growth of low-temperature pathogens is inhibited, resulting in some diseases such as water mildew, white spot disease; pay attention to the temperature difference between water temperature should not exceed 10 °C, otherwise prone to print diseases. In addition, adjusting the water temperature to the optimal temperature will promote the intake of Astragalus and enhance its constitution. 2. Adjust the density. Astragalus stocking density should be based on the size of the pond, the seedlings, feed and management levels. Specifications generally in the end of each 15 to 20 grams is appropriate, stocking 80 to 150 per square meter, stocking density of 1.5 to 2 kg / square meter, generally should not exceed 3 kg / square meter, pay attention to timely sub-pool. 3. Chinese herbal medicine prevention and treatment. The main approach for prevention and treatment of Chinese herbal medicine is to add crushed Chinese herbal medicine or infused Chinese herbal preparation to the compound feed, or to splash the whole herbaceous plant liquid or soak the stems and leaves of fresh Chinese herbal medicine in the dipping pond. At present, it has been confirmed that Chinese herbal medicine effective for Astragalus has purslane, rhubarb, astragalus, gallnut, tartary buckwheat tree, and Guanzhong and spicy sorghum. 4. Kill parasites. The intestinal parasitic parasites of Astragalus membranaceus, especially the nematodes and capillary nematodes, have very high parasitism rates and parasitic intensities, which is also an important reason for the slow growth of Astragalus membranaceus and decreased immunity. Therefore, the use of wild quail breeding to "treat the disease first," once the taming of the compound feed is successful, to immediately start killing parasites. In addition, as with soil cultivation, the static waterless soilless culture should also pay attention to the scientific construction of ponds and timely alkalinization, strict screening of fish species, reasonable tame feed, strengthen the daily management of Dianchi.