1, according to soil fertility with varieties. The leguminous vegetables can increase soil organic matter content and increase soil fertility. Long-term seedlings that require more nitrogen and more fast-growing leaf vegetables will cause imbalance in the nutrients in the soil and reduce fertility, leading to nutritional deficiency in some vegetables. Therefore, it is necessary to properly grow and grow vegetables with a short growth period, a need for more fertilizer and less fertilizer. 2, according to crop root depth rotation. Arrangement of deep-rooted root vegetables, solanaceous fruit, beans, melons (except bitter gourd) and shallow roots of leafy vegetables, onion and garlic rotation, the soil in different levels of fertilizer can be effective. 3, according to the needs of different vegetables on the nutrient rotation. Different vegetables have different absorption of nutrients, such as rape, cabbage and other leafy vegetables need more nitrogen, melons, tomatoes, peppers and other fruits and vegetables need more phosphate, the above three categories should be implemented rotation. Generally, more vegetables with more nitrogen need to be arranged. Soybeans with more phosphorus need to be arranged. The best bitter gourd, celery, and cabbage with good fat absorption are best for organic fertilizers. Pepper and so on. 4, according to the soil pH rotation. Planting potatoes, kale, etc. will increase soil acidity, while corn, pumpkin, etc. will reduce the alkalinity of the soil. Therefore, after planting corn and squash, alkalinity-sensitive onions and garlics can produce high yields. Potatoes and cabbages, followed by alkalinity-sensitive onions and garlics, lead to reduced yields. 5, according to the degree of occurrence of pests and rotations. Such as cucumber wilt, locust, etc., can also invade other melon vegetables, if you change the non-cucurbit vegetables, you will receive the effect of reducing or eliminating pests. Another example is the onion and garlic harvest after the kind of cabbage, can make the Chinese cabbage soft rot significantly reduced. In addition, the implementation of grain and vegetable crop rotation, crop rotation, can effectively control soil infectious diseases. 6, the use of large coverage varieties inhibit weeds. Some vegetables that grow rapidly or have high cultivation density, long growth period, and large leaf-to-ground coverage, such as melons, cabbages, and potatoes, have obvious inhibitory effects on weeds. Surgical Protective Clothing,Medical Surgical Protective Clothing,Surgical Protective Coverall,Protective Body Suit Guangdong Jia Mei Biological Technology Co.Ltd , https://www.jaymeimask.com