Continuous crop obstacles in vegetable fields must be comprehensively treated

Many vegetable farmers recently reported that after several years of continuous vegetable planting, vegetable dead seedlings, stiff seedlings, dead leaves, and malformed stems and leaves became more and more serious. Qi Bo, a researcher at the provincial vegetable office, pointed out that a large number of chemical fertilizers, soil acidification, lack of trace elements, serious soil-borne diseases, increased pesticide residues and nitrate content in vegetables, and secondary salinization under specific environmental conditions in sheds have caused agricultural ecology. Deterioration of the environment is the main reason for continuous cropping obstacles in greenhouse vegetables. Comprehensive measures must be taken to prevent and control them.
Use scientific fertilization methods. Adhere to the combination of basal fertilizer and topdressing, base fertilizer should be applied deeply, layered application or furrow application; top dressing should be combined with watering to promote foliar fertilizer application technology.
Promote the use of organic fertilizers. It is necessary to make full use of high-quality livestock and poultry manures that are fully decomposed, and the manure must be subjected to accumulation and fermentation. Organic fertilizers and inorganic fertilizers are applied in combination. Inorganic fertilizers have the characteristics of quick release of nutrients, but they need to be applied several times, while organic fertilizers have better fertility and can slowly release nutrients to ensure long-term nutrient requirements for crops.
Improve irrigation and drainage facilities. Between the sheds, dig deep trenches to lower the groundwater level. In the hot season of June-September, the plastic film can be removed to leaching the soil with rainfall and reduce the salt content of the soil. At the same time, submerged irrigation and furrow irrigation were replaced by drip irrigation and submerged irrigation.
Rational rotation for salt removal. In the late summer, cucumbers, peppers, tomatoes and other vegetables are planted in the late stage of growing a corn, without fertilizer, can reduce the soil salt content; plant Sudan grass, can also remove salt.
In addition, we must choose disease-resistant rootstock grafted seedlings to prevent and reduce the occurrence of pests and diseases. At the same time improve the planting ecological environment, and use the paddy-wheel rotation for the dumping, change the types of vegetables to prevent and control pests and diseases.

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