Planting the same kind of vegetables in the same plot in a row will cause problems caused by pests and diseases, malnutrition, deterioration of soil physical and chemical properties, etc. Guo Zhiqing, an associate professor at the College of Horticulture of Northwest A&F University, said that it is necessary to scientifically manage and overcome the obstacles of continuous cropping.

Different varieties of similar vegetables have different resistance to soil-borne diseases. The selection of disease-resistant, high-quality and high-yielding vegetable varieties is the prerequisite for improving disease resistance and the most economical and effective measure for controlling soil-borne diseases.

The rim is replaced by a rotation of the vegetable land that has caused serious damage to the virus source and the infectious disease, so as to reduce or eliminate pests and diseases. For example, the blight on crops such as cucumber and tomato is caused by Fusarium, and the cockroach contained in the roots of the scallions can inhibit the growth of Fusarium. Therefore, the second crop rotation or intercropping can effectively reduce the occurrence of blight.

Grafting and cultivating the scion that is susceptible to soil-borne diseases by using the resistant rootstock can avoid the infection and damage of the soil-borne diseases on the scion varieties. If Torubam and Totosca are used as grafts to grow eggplant, the effect is better.

Disinfection of soil disinfection soil is one of the important measures to overcome the obstacles of continuous cropping of vegetables. The applicable methods mainly include lime disinfection, high temperature disinfection, drug disinfection, etc. Lime disinfection must remove the residue from the front, and apply 50-100 kg of lime per acre in the ditch. Spread 1500 kg of straw such as straw, wheat straw and corn stover, and bury the lime and straw in the ground twice, generally with a depth of 30 to 40 cm. After ploughing and compacting, the cover film is sealed to prevent water dispersion and temperature drop. Water is poured from the film until the soil is sufficiently moist, and the field cannot accumulate water. Various chemical agents or biological agents can also be used to disinfect the soil by spraying, watering, soil mixing, fumigation, and the like. The spraying and watering method is suitable for field, nursery nutrient soil, greenhouse and the like.

If the dosage of nitrogen fertilizer is too high, the soluble salt content in the soil will be obviously increased, and the pests and diseases will be aggravated. The ratio of nitrogen, phosphorus and potassium and the amount of fertilizer should be determined according to the fertilizer requirement of various vegetables and the ability of soil fertility. To re-apply mature organic fertilizer, organic fertilizer can not only increase soil organic matter and trace element content, but also improve soil structure, increase fertilizer, water retention, fertilizer supply, ventilation, temperature regulation and other functions. Continuous cropping tends to cause the loss of trace elements in the soil. Therefore, in the application of fertilization, in addition to the application of nitrogen, phosphorus and potassium compound fertilizer according to the law of crop fertilizer, it is necessary to pay attention to the supplement of trace elements.

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