Rotation refers to the planned rotation of different types of crops in the same land and different types of multiple cropping forms called rotation. Planting a crop or a multiple cropping plant on the same land for a long period of consecutive years is called continuous cropping, also known as heavy cropping; Continuous cropping often causes a reduction in production, which easily leads to a "soil disease" phenomenon. Therefore, in the process of conversion to organic agriculture, crop rotation is the first problem to be solved. Only by solving the problem of crop rotation can we get rid of the agricultural chemicals that modern agriculture relies heavily on to achieve the production of organic agriculture. The following are the characteristics of the rotation of common vegetables: Cucumber: Before the spring cucumber, the first crop is mostly autumn vegetables or spring vegetables and winter vegetables, and the latter species is suitable for various autumn vegetables. The summer cucumber crop is suitable for all kinds of spring and summer vegetables, and the latter is suitable for winter vegetables or spring. Dishes. Cucumber and tomato inhibit each other and should not be cropped and interplanted. Tomato: 3-5 years of crop rotation, not in conjunction with solanaceous crops, the former is a variety of leafy vegetables and root vegetables, the latter can also be leafy vegetables and root vegetables, and short stalk crops or vegetables, interplanting, such as soybeans, cabbage, Bulbous fennel, onion, garlic and other intercropping. Eggplant: The former is wintering leafy vegetables, and can also be interplanted with early growing cabbage, early-maturing cabbage, spring radish, water radish, cherry radish and other short-growing vegetables. After the pod can be planted cabbage and other autumn vegetables. Pepper: It is not suitable for continuous cropping with solanaceous crops. It can be used for intercropping with short stalk crops such as leafy vegetables, root vegetables, and peanuts. Beans: beans, peas, Dutch beans, sweet crisp beans, rack beans, etc. should not be contiguous. The former is a fall/winter dish or unused land, and the open food, rice, corn, peanuts and other food crops can be used as a forehead. The southern spring eel is spring radish, spinach and other spring vegetables, and the latter vegetable is mainly wintering spinach, celery, Chinese cabbage, and autumn cabbage. In the south, there are autumn potatoes, radish cabbage, black cabbage, kale and Chinese cabbage. In the north, it is particularly suitable for intercropping with high stalk crops. Radish: autumn and winter radish gargle more than melons, solanaceous fruit, beans is appropriate, early spring radish is spinach, celery, cabbage, autumn lettuce and carrots; seasons radish can be set apart with pumpkins. Potatoes: Former crops are onions and cucumbers, followed by cereals and soybeans. Solanaceae crops should not be rotated between each other. It is also not appropriate to rotate with root vegetables. When interplanting with other crops, attention should be paid to: (1) Precocious and short-stemmed varieties should be selected; (2) Co-existing period should be shortened as soon as possible, and product and organ formation should be staggered; (3) Less competition for temperature, light, water, fertilizer and impact management . Welsh onion: The most bogey continuous crop. It takes more than three years to turn crops into rotations with food crops to cultivate Chinese cabbage and melon vegetables using green onions. Before the growth of green onions early radish species, late interplanting spinach and other overwintering crops. Onion: It is a good fore crop of autumn fruits and vegetables. It is intercropped with tomatoes, melons and other melons and fruits, or interplanted with lettuce, radishes, dwarf cowpea, bulb anise and eggplant. Garlic: Most avoid continuous cropping, or with other Allium plants. The seeds of autumn sowing garlic are best for the early-maturing beans, melons, solanes, and potatoes; the spring sowing of garlic is best for autumn beans, melons, pumpkins, and eggplants; it is a good forerunner of other crops. Cabbage: Rotating with rice; not suitable for continuous cropping and rotation with other cruciferous crops. In the rotation: (1) select vegetables with early harvest, such as eggplant; (2) choose more vegetables before the election, such as cucumber and watermelon; (3) onions and garlic for the former, can reduce pests and diseases. Cabbage was planted on the leeks or in the garlic ridge, and the disease was significantly reduced. Melon: 5-6 strains of ginger are grown among wax gourds. One side of the pod grows and the other grows. After April and May, the leeks were interplanted with wax gourd or pepper, eggplant interplanting wax gourd, tomato interplanting wax gourd, melon under the interplanting of bulbous fennel, lettuce, cabbage and leafy vegetables; in the mountains, wax gourd was interplanted with ginger.