First, the phytotoxicity vegetable seedlings are small and tender, with poor drug resistance. In the application of pesticides, if the method is improper, it is easy to produce phytotoxicity. There are three main reasons for the occurrence of phytotoxicity: one is improper selection of pesticides, the second is improper spraying time, and the third is excessive usage. In order to prevent seedlings from producing phytotoxicity, it is necessary to prescribe the right medicine according to different pests and diseases, the concentration should be appropriate, the preparation should be uniform, the spray mist should be fine and uniform, and it should not be focused on the local site for a long time, and there should be water droplets on the leaves. can. If it is found that the spraying concentration is too high, clean water should be sprayed immediately to avoid phytotoxicity. The spraying time should be carried out after ventilation in the morning for 1 to 2 hours. It is forbidden to spray the medicine when it is in the sunny shelter. Second, fertilizer harm is due to improper preparation of nutritious soil such as adding excessive nitrogen fertilizer or organic fertilizer is not fully cooked. In addition, high fertilizer concentrations in the top dressing can also cause fertilizer damage. After the occurrence of fertilizer damage, the seedlings will appear fallen leaves, rot and
Other phenomena. In order to prevent the occurrence of fertilizer damage, nutrient soils should be reasonably prepared, organic fertilizers should be applied well, and nitrogen, phosphorus and potash should be used in a reasonable manner. The concentration of fertilizer solution should be appropriate when dressing fertilizers outside the roots. Top dressing should be carried out on a sunny morning after 1 to 2 hours of ventilation. Once the fertilizer is damaged, spray water immediately and ventilate and dehumidify. Third, grass damage due to the warm and moist environment of the seedbed, fertile bed soil, seedbeds easy to grow weeds. To prevent weeds from harming, we must first strictly build nutritious soil and kill the weed seeds during the composting process. Manual weeding can occur when weeds occur.
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