The Prevention of "Three Injuries" in Summer of Vegetable Seedlings

Vegetable seedlings "three pests" mainly refer to phytotoxicity, fertilizer damage and grass damage. First, the occurrence of drug injury is caused by improper selection of pesticides, high spraying concentration, unequal pesticide formulation, improper spraying time, excessive use of the application and other reasons. 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, it should be well-mixed and uniform. The spray mist should be fine and uniform, and it can not focus on the local site for a long time to spray water. . If it is found that the spray concentration is too high, spray water immediately to avoid phytotoxicity. The spraying time should be carried out in the morning ventilation 1 hour - 2 hours later, it is strictly prohibited to spray when the sun is hot and stuffy. Second, fertilizer damage is due to improper preparation of nutritious soil, adding excessive nitrogen fertilizer or organic fertilizer is not fully cooked, or caused by high concentrations of top dressing. The phenomenon of deciduous and rotted roots occurs when vegetable seedlings are damaged. The nutrient soil should be properly prepared, and the organic fertilizer should be used. When the nitrogen and potassium fertilizers are properly matched, the fertilizer should be well-distributed, and the fertilizer concentration should be properly formulated when the fertilizer is applied outside the root. Top dressing should be done 1-2 hours after sunny morning ventilation. Water should be sprayed immediately in case of fertilizer damage. Third, grass damage due to the warm and humid seedbed environment, bed fertile, seedbeds prone to weeds. On the one hand, weeds compete for vegetables with vegetables, and on the other hand bring pests and diseases to vegetables. To control weeds, we must first strictly build nutritious soil to kill weed seeds during the composting process. Weeding can be done manually when weeds are released.

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