Land preparation is an important part of farmland planting techniques. After selecting land parcels, it is necessary to carry out 1-3 years of leisure land-raising process, and to plant green manure crops such as soybeans, grasshoppers or Suzi in the spring. Suzi has insect repellent, sterilization, and fertilizer effects, and is the preferred green manure crop. In the first half of July, when the crop enters a vigorous period of vegetative growth, the green manure crop is cut down and shredded, spread evenly into the field, and the first ploughing is performed at a depth of 20-25 cm, and the ploughing is performed once every 15 days. Pick the clean stones. Plowing is beneficial to withholding green manure crops, accelerating rot, increasing organic matter content, and improving soil fertility; facilitating soil ripening, loosening soil, deepening plough layer, improving soil physical and chemical properties, favoring the decomposition and transformation of harmful substances, and facilitating the killing of eggs. Destroy pests.
Chinese herbal medicine chemistry refers to the science of using modern chemical theories and methods to study the chemical composition of Chinese herbal medicine. The object of Chinese herbal medicine chemistry research is the chemical composition of Chinese herbal medicine. The chemical composition of Chinese herbal medicine is very complex, usually sugar, Amino Acid, protein, oil, wax , enzymes, pigments, vitamins, organic acids, tannins, inorganic salts, volatile oils, alkaloids, glycosides, etc. Every Chinese herbal medicine may contain multiple ingredients. Among these ingredients, some of them have obvious biological activity and play a medical role, and are often called active ingredients, such as alkaloids, glycosides, volatile oils, amino acids, etc. The reason why Chinese herbal medicine has medical effects is mainly due to the active ingredients it contains. In addition to many active ingredients of Chinese herbal medicines that have been studied in the past and have been widely used, such as berberine (berberine), which is Antibacterial and anti-inflammatory in Coptis chinensis, ephedrine, which is antiasthmatic in Ephedra, and reserpentine, an antihypertensive ingredient in Rauwolfia, In recent years, more active ingredients of Chinese herbal medicines have been discovered one after another at home and abroad, especially in terms of biological active ingredients for anti-tumor, treatment of cardiovascular diseases and chronic bronchitis. Other ingredients are commonly found in Chinese herbal medicine, but usually have no biological activity and no medical effect, and are called "ineffective ingredients", such as sugars, proteins, pigments, resins, inorganic salts, etc.
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