Reasonable rotation of planting vegetables can make full use of soil nutrients. Different vegetables have different nutrient absorption. The rotation of vegetables with more nitrogen, more phosphorus and potassium, or deep-rooted vegetables with shallow root vegetables can make full use of nutrients at all levels of the soil. Generally, leafy vegetables with more nitrogen are preferred. Soybeans with more phosphorus need to be arranged. Cucumbers, celery, and spinach, which are fast-sucking, are the best varieties of tomatoes, eggplants, and peppers that respond well to organic fertilizers. The rational rotation of different vegetables for planting can cause pathogens to lose their parasitic environment and thus reduce or disappear. Such as cucumber wilt, locusts and so on. It can also infect other melon vegetables. If the non-cucurbit vegetable is changed, it will reduce or eliminate the pest. Another example is the onion and garlic harvest after the kind of cabbage, can make the Chinese cabbage soft rot significantly reduced. Such as the implementation of grain and vegetable crop rotation, crop rotation, more effective in controlling soil infectious diseases. Potatoes, kale, etc. will increase soil acidity, while corn, pumpkin, etc. will reduce soil acidity. Therefore, high-yield can be achieved by using acid-sensitive onions as a postharvest for corn and pumpkin. The leguminous vegetables can increase soil organic matter content and increase soil fertility. Long-term planting of leafy vegetables that require more nitrogen will make the nutrients in the soil unbalanced. Therefore, the growth period and growth period should be short and the fertilizer needs to be increased. It is suitable for planting with less-needed vegetables. Some vegetables that grow rapidly or have high cultivation density, long growth period, and large leaf-to-ground coverage, such as melons, cabbages, beans, and potatoes, have a significant inhibitory effect on weeds. When we grow carrots, celery, and other vegetables that grow slowly and have small leaves, weeds grow easily. The rotation of these vegetables can significantly reduce grass damage.
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