The midsummer high temperature season is a critical period for astragalus cultivation. The summary of the management techniques of Huang Xia's Midsummer is as follows:
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First, control the water temperature
When the water temperature is higher than 28°C, the food intake of Astragalus membranaceus significantly decreases and the growth is inhibited. In the hot season, due to the shallow water level in the Dianchi Lake, the temperature of the water can easily rise to 28°C. Therefore, it must be done in the summer season. The main methods are as follows: First, planting or stocking aquatic plants, such as white peony, water hyacinth, duckweed, etc., but the area for planting or stocking should not exceed 1/3 of the total area of ​​the culture pond. The second is scaffolding shading. To plant some loofah, cucumber, lentils and other creeping plants, the shade area accounts for 2/3 of the total area of ​​the culture pond. Third, change the water frequently. Always pay attention to the water temperature, and add new water in a timely manner so that the water level is maintained at 20 to 25 cm. It is best to change the water once a day and change the water volume to 1/4 to 1/3 of the pool water.
Second, water quality management
The water quality of Dianchi Lake should be kept fat, tender, live and cool. The water color is light brown or tender green, the transparency is about 25 cm, and the dissolved oxygen is kept above 4 mg/l. Due to shallower ponds, organic fertilizers are generally not used to avoid damaging the water quality.
Third, scientific feeding
Astragalus is best fed with live feeds such as cockroaches, fly maggots, snails, and river eels. At the same time, some plant foods, such as bran and melon skin, were cast concurrently. Feeding in midsummer is generally appropriate in the evening, but it can also be postponed slightly. The general feeding amount is 6% to 8% of the weight of the pond, and the fresh feed must be cleaned and sterilized before feeding.
Fourth, daily management
Frequently inspect the inlet and outlet of the anti-evacuation net for damage, and timely maintenance after damage; prevent the inflow of rainwater into the pool, and escape with the water; prevent birds, beasts, snakes, rats and other predators from invading and preventing pesticide poisoning.
V. Disease Prevention
1, fever. Due to the large stock of Astragalus, the secretion of mucus accumulating on the surface of the carcass caused the concentration of dissolved oxygen in the water to decrease, and the Astragalus became restless, entwined and crowded with each other. The body temperature rose sharply, and the carcass died of fever. Control methods: Reduce the density of jaundice and replace new water immediately after onset.
2, coma disease. The disease is more common in hot seasons. Control methods: First shave and cool, then chop the fresh clam meat and sprinkle it into the pool, which has a certain effect.