Vegetable continuous cropping technical measures

For the vegetable fields that have caused serious damage to the virus source and infectious diseases, it is necessary to take evasive measures for these diseases, and regularly implement intercropping for rotation, changing the living environment of these pests and diseases, thus causing them to lose their host and cut off Their nutritional sources are aimed at reducing or eliminating 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.

The soil is disinfected before the removal of the residue, 50-100 kg of lime per acre, and straws, wheat straw, corn stover and other straws are placed in the furrows for 1000-2000 kg. The lime and straw are buried twice underground, generally buried depth. It is 30 to 40 cm. The straw is as short as possible, compacted after ploughing, and covered with a film 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. Or use a variety of chemicals or biological agents to disinfect the soil by spraying, watering, soil mixing, fumigation, etc. Spraying or watering is to spray the liquid on the surface of the soil or directly into the soil, so that the liquid penetrates into the deep layer of the soil and kills the bacteria in the soil. The spraying and watering method is suitable for field, nursery nutrient soil, greenhouse and the like.

Rational application of NPK fertilizer chemical fertilizer, especially if the amount of nitrogen fertilizer is too high, will significantly increase the soluble salt content in the soil, increase the pests and diseases, and affect the yield and quality of crops. Therefore, it is necessary to rationally apply NPK fertilizers, that is, to determine the ratio of nitrogen, phosphorus and potassium and the amount of fertilizer used according to the fertilizer requirements of various vegetables and soil fertility.

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