The appropriate temperature in autumn is the peak season for the growth of Astragalus. Intensifying the feeding and management of the autumn Dianchi Lake is the key to ensuring the high yield and high efficiency of the cultivation of Scutellaria baicalensis.
First, improve water quality. The water depth in Dianchi Lake should be controlled at about 30 cm, and the residual baits and dirt in the pool should be removed in time to keep the water quality “fat, live, tender, and coolâ€. The water color is refreshing, light brown or tender blue, and often changes, so that the pool water Fat but not old. Every 1 or 2 days, change the water 1 times, and regularly apply quicklime to adjust the pH to control the pH of the pool water to be between 7 and 7.8.
Second, control the water temperature. The optimum temperature for astragalus cultivation is 24～28°C. In early autumn, the temperature is high, and the water temperature in the direct sunlight will rise rapidly, affecting the appetite of the jaundice and inhibiting its growth rate and even causing death. In this period, water, shade, and grass should be used to control the water temperature below 28°C.
Third, strengthen feeding. In the autumn, Astragalus ingests vigorously, and it is necessary to ensure the supply of high-quality and sufficient feed to promote the rapid growth of Astragalus. The bait is mainly based on fresh bait such as cockroaches, fly maggots, snail meat, and viscera of livestock and poultry, and is supplemented with appropriate amounts of plant foods such as wheat bran, pancake, and fruits. In general, the amount of fresh bait is about 8% of the body weight of baicalin, and the amount of dry bait is half of the fresh bait. It is forbidden to feed the contaminated or spoiled bait. Feeding should adhere to the principles of timing, positioning, quality, and quantitative. Special attention should be paid to the amount of feeding. If the amount of food consumed by the carp is reduced in bad weather, the feeding should be reduced.
Fourth, pay attention to prevent escape. In case of abrupt changes in the weather, the carp feels uncomfortable and uneasy, and waits for opportunities to escape. It is most likely to escape in thunderstorms or nighttime rainstorms. Therefore, you should always check whether there is any crack in the wall or the bottom of the tank, whether the drainage network is in good condition and whether the water depth is close to the overflow level.
Fifth, prevent diseases. Fall is also a period of high incidence of rickets, the common diseases and prevention methods are as follows:
1. Cold disease. The main reason is that the temperature changes greatly, causing a drastic change in the water temperature and leading to a yellow fever. Strictly control the temperature, master the amount of water change, and prevent the temperature difference between the front and rear of the Dianchi Lake to be excessive.
2. Fever. Because the pool water is too shallow and the water temperature is too high, the sickness is restless and often falls out of the water or lays on the grass and frequently swings its head, hunger without food, and finally dies. The preventive measures are to cool the shade and add new water. After the onset of jaundice, each cubic metre of water is sputtered evenly with 5 ml of 0.07% copper sulfate solution. Can also use 100 grams of green onions per cubic meter of water, salt, 50 grams, 15 grams of mulberry leaves mash into juice Quanchiposa, 2 times a day, once every 2 to 3 days.
3. Saprolegnia. The mold spores absorb the skin and nutrients of the astragalus, and grow out of the cotton-like hyphae outwards, and then spread and expand on the surface to form a white hair that is visible to the naked eye. Methyl blue 3 grams per cubic meter of water can be used to splash water to Quanchipi; it can also be splashed with 0.04% salt and 0.04% baking soda mixture.
4. Turnip disease. In the early stages of the disease, erythema with various sizes appeared on the body surface. The sides of the abdomen were a little congestive and inflamed. The skin was festooned when the disease was severe. There were irregular holes in the epidermis and they died of visceral infection. Prevention and treatment of the disease, can be used per cubic meter of water body 5 to 10 milliliters of rickets disease, Quanchiposa, used for 3 days; also per cubic meter of water body with 2 grams of Gallic Jianshui Quanchiposa, once every 2 to 3 days.
5. Hemorrhagic disease. The sickness fluctuates up and down or circling in the water. If it moves for a long time, it will be unable to swim. It will lie on the aquatic plants in a state of suspended animation. There are blood spots on the surface, the shape of the plaque is variable, and the size varies. The area is serious and the entire body surface is weighted on the abdomen, with few on both sides and the mortality rate is high. One gram of erythromycin per cubic meter of water can be used to sprinkling the water to the whole pool, and at the same time feeding 1% to 3% of the rhubarb tablets in the feed, has a good effect.