Autumn sowing garlic to rice, corn, sorghum, wheat, beans, melons, tomatoes, potatoes better; spring sowing garlic beans, pumpkin, eggplant vegetables, cotton, beans, etc. as well. There is a large amount of fertilizer during the growth of garlic, and the roots of garlic can secrete substances that have a certain bactericidal effect, so it is also an ideal forehead of other vegetables. At the same time can also be intercropped with corn, cotton, herbs and various types of vegetables, interplanting. In northeastern and northwestern regions, garlic is used as a monoculture; in northern China, crops are interplanted with other vegetables and food crops. Cotton production areas in Hebei province intercropping cotton between cotton rows; many suburban community teams planted broad bean and dwarf peas in garlic. Pumpkin is a kind of intercropping of garlic and garlic, garlic and other vegetables.
The determination of the garlic cultivation season mainly depends on the general requirements and varieties of garlic on the external environmental conditions during different growth and development periods, and the climatic conditions of each region. The garlic can germinate at a low temperature of 3～5°C, and the germination temperature is faster than 12°C. The suitable temperature for seedling growth is 12～16°C, the optimum temperature for bulb formation is 15～20°C, and the root system withered more than 26°C. The leaves are dry and the false stems are loose and fall into dormancy.
The sowing time for garlic varies depending on the region and variety, and can be divided into autumn sowing and spring sowing. The boundary between spring and autumn sowing of garlic is 35-38°C north latitude. Winter in the area south of 35°C is not too cold. The garlic seedlings can be naturally exposed to winter, mostly in autumn, and harvested in early summer. In the area north of 38 degrees Celsius north, the winter is cold, the seedlings can not safely winter, autumn broadcast easy to be frost damage, sowing in the early spring, summer or late summer harvest. The spring and autumn broadcasts can be made between 35 and 38°C in the north. Although the specific planting time varies from place to place, the average daily temperature in spring sowing is generally between 3 and 6°C; the average daily temperature during autumn sowing is between 20 and 22°C. The growth period of spring sowing garlic, especially the growth period of seedlings, is significantly shorter than that of autumn sowing garlic. Therefore, it should be sown as early as possible so as to meet the requirement of low temperature during the vernalization process, so that the garlic can be bolted and split. If it is sown late in spring, it will inevitably affect the formation of products and reduce production.
