Spearmint is a spice crop. After stems and leaves are processed and distilled, orchid oil can be given. Spearmint oil is light yellow, transparent, contains spearminone components, and has a fragrant smell. It is loved by people. It can be used as flavors and spices, and can be used for export. It can also be used to prepare toothpaste, high-grade candy, beverage, and dredging agent. Spearmint hi moist, strong adaptability to the soil, but avoid excessive acid, excessive alkali, sandy soil with more humus cultivation best. In low-yield fields, spearmint and late-season rotations are used. Because of their high number of stems and leaves, they can play a role in improving soil and contribute to the growth of late rice. Planting seedlings and cuttings from the ground stems and underground stems can produce seedlings. Since seed reproduction is prone to variation and it is difficult to keep seed, it is generally used for propagation on the ground stem cuttings. It usually takes place between the beginning of winter and the heavy snow. The method is to cut the stem base 10 cm for seedlings, spacing by 33 cm, spacing 23-26 cm, inserted in the planting hole, the upper part of the ground slightly exposed, after plugging watering 1--2 times, you can survive. Approximately 150 kilograms per 667 square meters are used. Cultivation of spearmint, should pay attention to fine soil preparation, Shizujifei, open drainage ditch. After planting, attention should be paid to sparse clearance, weeding and weeding, and reasonable fertilization. After the topdressing is performed in the cultivator, human urine and ammonium sulfate can be applied, and the application should be completed one month before the harvest. Water should also be poured during drought. Spearmint can be harvested for two to three times a year. During the flowering season, the oil content in the stems and leaves is the highest, but the oil quality is best when they are seeded. After harvesting the head knife, it is necessary to plan the roots in time and cover the soil surface with straw grass to promote the emergence of the second knife as soon as possible. The first knife can be harvested between the summer and the summer, and the second knife is harvested between the cold and the frost. The extraction of spearmint oil is generally carried out by placing stems and leaves in a distillation pot and steam distillation. Distillation requires fierce and uniform fire, the pot must maintain quantitative moisture; raw materials require clean, no impurities. Since the proportion of spearmint sesame oil (0.92--0.94) is close to that of water, it is difficult to extract the oil, and the distilled water remaining after the extraction of oil can be mixed with the next batch of stems and leaves and distilled again. China Agricultural Network Editor
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