Seed treatment techniques of artificial planting of Glycyrrhiza uralensis
Licorice seed coat is solid, water absorption is poor, the germination rate is only 4-6%, need to be milled or sulfuric acid treatment, break the seed hard state, improve the germination rate and emergence rate.
1. Sulfuric acid treatment. Stir the pure seeds with 20-30 milliliters of 80% sulfuric acid per kilogram. See that the seed coat has uniform marks of sulfuric acid etching, then rinse with clean water and dry for use. The time of seed treatment is related to the temperature and the amount of acid added. In the case of the same amount of acid, the treatment time is short when the air temperature is high, and the treatment time is long when the air temperature is low. If more acid is added, the treatment time will be short, otherwise the treatment time will be long.
Second, the method of crushing the seed coat. Put the seeds on a grinding plate, 3 cm thick, turn with the grinder, when the seed coat is yellow and white, then soak the crushed seeds in warm water of 40 ℃ for 2-4 hours, remove them and rinse off the mucus with clean water to sow.
The method of crushing seeds with rice milling machine is simple and easy, the cost is lower than sulfuric acid method, and it is harmless. The crushing is light, the seed coat cannot be crushed, the seed is heavy and the waste is serious. It is appropriate to cut the material quickly and grind it 3-4 times. From the appearance, there is an obvious lack of coat or the breaking rate of seed coat is more than 90%.
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Biological characteristics and growth habits of Glycyrrhiza uralensis
1. Biological characteristics (1) Flower size and seed characteristics due to different habitats, licorice naturally formed three ecotypes, namely sand grass, beam grass and beach grass. The flower size of different ecotypes of Glycyrrhiza uralensis is similar, but the difference of seed size is obvious, the order of seed size is beach grass > beam grass > sand grass, and the hard seed rate is beam grass > sand grass > beach grass. Licorice cultivated with seeds generally blossoms and bears fruit after 3 years. (2) Distribution characteristics of root and rhizome of sandy grass
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Control of Brown spot of Glycyrrhiza uralensis
Brown spot is a half-known fungus infection in fungi, which mainly harms leaves. Its symptom is: the leaf produces round or irregular disease spot, the center of the disease spot is grayish brown, the edge is brown, and there are black mildew on both sides of the disease spot. Control method: spray 1 ∶ 1 ∶ 100-1 ∶ 1 ∶ 160Bordeaux liquid or spray 70% methyl topiramate wettable powder 1500-2000 times.
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