Licorice is a perennial herb of the family Leguminosae. It uses dried roots and rhizomes as its medicine. It has the effects of replenishing spleen, replenishing qi, removing phlegm, relieving cough, clearing away heat and detoxification, relieving urgency, relieving pain, reconciling the potency of medicinal herbs, and relieving 100 poisons. Licorice is not only a kind of bulk medicinal material, but also a non-caloric sweet additive in food, and an important auxiliary material for cigarettes and other industries. Therefore, the amount of licorice is increasing. As the natural resources of licorice are increasingly depleted, artificial cultivation must be carried out. Due to the dense structure of licorice seed coat and the dehydration and denaturation of protein, the problems such as slow emergence of licorice planting, uneven seedling emergence, and low seedling emergence rate have been caused. In order to increase the emergence rate of licorice in production, it is necessary to collect seeds reasonably, that is, to select plants that are more than 3 years old. During the flowering and fruiting period, the flowers or fruits near the branch shoots are removed, so that the seed maturity is relatively uniform, and large and full grains can be obtained. seed. Seed production should be the best when the seeds from the green hardened brown seed, such seed hard rate, seed treatment is simple, high seedling rate. In addition, the seeds of licorice must be treated before sowing. The specific methods are as follows. 1 Boiling water soaking method Put the selected fresh seeds into 100°C water (times) to cool naturally, soak for 6-8 hours, then remove the seeds and rinse the mucus on the seed coat with water. 2 Warming and soaking method The seeds are soaked in warm water and soaked for 6 to 8 hours. At this time, 2/3 of the seeds are full of water, and the unsweetened seeds (unsaturated hard seeds) are divided into 2 layers. The unsaturated seeds are The seeds soaked in, but not floating on the surface of the water, can be poured out of the soaked seeds with water, repeated several times, until the soaked seeds are all poured out. Unsaturated seeds are soaked in boiling water at 100°C for 2 to 3 seconds, removed and immediately placed in cold water to stimulate the seed coat to be irritated by cold and heat, and then soaked in warm water at 60°C for 2 to 4 minutes. Hours, together with the floating seeds, wash the mucus on the seed coat. The germination rate of seeds treated with this method can reach 91.3% and the emergence rate can reach 90%. 3 Sand-soaking seed soaking seeds into 1/3 fine sand, grind it for 3 to 5 minutes in the pot, till the surface of the seed is dull, there are traces of sand, go to fine sand, and soak in the warm water of 60°C 6～ For 8 hours, wash the mucus on the seed coat. 4 Milling method The seeds were spread on the mill pan and the thickness was 3cm. The seed was turned with the mill and the seed coat was closely monitored. When crushed to the seed coat is greenish white, soak the seed in warm water of 40°C for 2 to 4 hours, and wash the mucus on the seed coat. The seed germination rate treated with this method reached 90%, and the emergence rate reached 85%. 5 electric rice grinding machine grinding first seed sieving and grading, and then use the high-speed rolling mill, so that the seeds high-speed friction with each other, to scratch the seed coat, grinding to close to the cotyledon but do not hurt the cotyledons, the integrity of the seed . The method of checking whether the treatment is qualified is to grind the seeds that have been grinded in the pan and soak them with a small amount of water for 2 to 4 hours. If most of the seeds have swelled, it means that the treatment is qualified and the unqualified can be grinded again. If the seed coat has been broken after grinding, it means that it has been overrun and it cannot germinate. This method saves labor, saves time, and has a good effect. The germination rate can reach 97%, which is suitable for the treatment of a large number of seeds. 6 Concentrated sulphuric acid soaking method utilizes the corrosive action of concentrated sulphuric acid on the seed coat to thin the testa. Specific methods: add 98% of sulfuric acid (30-34mL) per 1kg of seeds, mix well, and continue to stir, so that the seeds are in full contact with concentrated sulfuric acid, after a suitable period of time, quickly rinse with water and dry. It usually takes about 70 minutes to corrode, and for some seeds with thick seeds, the treatment time must be extended. Black round corroded spots are generally preferred on most seeds. The germination rate of treated seeds can reach 90%.