Seedlings of phytotoxic vegetables are tender, their drug resistance is poor, pesticides are used improperly, and they are prone to injury. In the event of a phytotoxicity, the leaf blades of the vegetables are distorted or the leaf margins are gradually becoming dry and the growth is blocked or even died. The main causes of phytotoxicity are improper selection of pesticides, high concentration, unequal preparation, improper spraying time, and excessive dosage during application. The method of preventing drug injury is to prescribe the right medicine according to different pests and diseases, and the concentration should be appropriate. When mixing, the mixture should be fully stirred and evenly sprayed. The fog should be finely and evenly sprayed, and the spraying of fog at a local location can not be concentrated for a long time. If it is found that the spray concentration is too high, spray water 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. Damage caused by fertilizers is due to improper preparation of nutritious soil, adding excess nitrogen fertilizer or organic fertilizer that is not mature enough, or the concentration of top dressing fertilizer is too high. The phenomenon of deciduous roots was observed when vegetable seedlings were damaged. The nutritious soil should be reasonably prepared, and organic fertilizer should be used. The nitrogen, phosphorus and potash fertilizers should be properly mixed and evenly mixed. When composting the roots, the fertilizer concentration should be properly formulated. Topdressing should be carried out on a sunny morning after 2 to 2 hours of ventilation. Immediately ventilate and apply moisture after dressing. In case of fertilizer damage, spray water immediately and ventilate and dehumidify. Grass damage is caused by the warm and moist environment of the seedbed, fertile bed soil, and long seeding weeds. On the one hand, weeds compete with vegetable seedlings for seedbed nutrients; on the other hand, they bring pests and diseases to vegetable seedlings. To control weeds, nutrient soils should be strictly piled up to make weed seeds die during the process of composting. If weeds can be manually weeded.
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