There are many varieties of vegetables, short growth cycle, high multi-population index, scientific and rational arrangement of gargle, which can restore and improve soil fertility, reduce pests and diseases, increase yield and improve quality. It is an important agricultural measure. The implementation of vegetable gargle rotation should mainly be based on the following principles:
Make full use of soil nutrients. Leafy vegetables such as green vegetables and spinach require more nitrogen fertilizer. Tomatoes, peppers, melons and other fruit vegetables require more phosphate fertilizer. Potatoes, yam, taro and other root vegetables require more potassium fertilizer. They can be used for rotation and can make full use of soil. Various nutrients in the.
The roots are shallow and reasonable. The deep-rooted solanaceous fruits, melons, and beans are rotated with shallow-rooted cabbage, onion, and garlic, and the fertilizers at different levels in the soil can be rationally utilized.
Control diseases and infect each other. The rotation of grain and vegetables and the rotation of water and drought can effectively control the soil-borne diseases; the cultivation of Chinese cabbage by onion and garlic can greatly alleviate the occurrence of soft rot.
Promote improved soil structure. Beans and vegetables have rhizobium to fix nitrogen, which can improve soil fertility, and then plant leafy vegetables and eggplants that require more nitrogen, then grow roots and onions that require less nitrogen, and then grow melons and leeks with developed roots. Rotation can greatly improve the soil aggregate structure.
Soil acid and alkali complement each other. Cabbage and potato can increase the acidity of the soil after planting, while pumpkin and sweet corn can reduce the acidity of the soil after planting. Therefore, the onion which is sensitive to soil acidity will reduce the yield after the former, and the latter will increase the yield. Bean rhizobium also leaves more organic acid in the soil, so it is not suitable for continuous cropping.
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