With the continuous increase in the specialization of vegetable production and rental of land rent, the utilization rate of vegetable land is gradually increasing. Among them, cropland rotation is an important agronomic measure to increase the utilization rate of vegetable land. However, unreasonable crop rotation often leads to a nutrient or a certain nutrient in the soil. A serious deficiency of nutrients occurs. First, pay attention to the full use of nutrients in the soil Most of the different types of vegetables have different biological characteristics and different nutrient requirements. Crops and varieties with different nutrient requirements for nitrogen, phosphorus, and potassium are rotated. Shallow-rooted and deep-rooted vegetables Reasonable collocation can make good use of various nutrients in soil. In general, leafy vegetables have more nitrogen requirements, melons have more potassium requirements, and beans have more phosphorus requirements, so the beans can be arranged after production. Leafy vegetables, leafy vegetables and so on. The long-term planting of a certain type of vegetable often leads to a deficiency of a certain nutrient element in the soil, is prone to deficiency of the disease, reduces the yield and quality, and avoids continuous cropping on the production. Second, pay attention to the impact of pH on the soil Organic acid will be secreted during the growth of beans, so that the soil acidification, and the kind of pumpkin will neutralize the acidity of the soil, the subsequent cultivation of the pH sensitive lettuce and onion garlic is most suitable, can improve In terms of yield and quality, leeks like alkaline soils, yam pods in alkaline soils are prone to scab, so yams cannot be arranged after leeks. Potatoes increase the acidity of the soil, so potato plots can be planted with pumpkins. Third, the impact of diseases and insect pests Scientifically and rationally arrange different types of vegetables can make pathogens lose their parasites, or change their living environment, so as to eliminate or reduce the occurrence of pests and diseases. For example, onions and garlic vegetables secrete a special spicy taste and a small amount of sulphides, which inhibits the pests and diseases of most leafy vegetables. Fourth, the impact on weeds The fast-growing leafy vegetables and large-leaf melons have inhibitory effects on weeds. On the other hand, leafy, slow-growing onions, yam and yam are prone to weed growth, and their rotation in production can reduce weed damage.
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