Drug vaccine
There are many reasons for the emergence of drug seedlings: first, misuse of pesticides that are not suitable or misuse of herbicides; second, the application of pesticides with excessive concentrations or continuous repeated application; third, application under high temperature conditions; Inferior pesticides; Fifth, the application of pesticides is not correct or can not be mixed with a simple mixture of pesticides.
Control measures: First, spray water in a timely manner. If the leaves and plants cause phytotoxicity due to spraying liquid, if they are discovered in time, they can be quickly sprayed with plenty of water when the early liquid has not completely penetrated, spray water repeatedly 3-4 times, try to flush the liquid on the surface of the plant. Lose, and with the cultivator loose soil, promote root development, and quickly restore normal plant growth. The second is neutralization treatment, spraying plant growth regulators. According to the nature of pesticides that cause phytotoxicity, neutralization of drugs with opposite properties is used. For example, spray copper sulphate can be used to neutralize 0.5% lime. The third is to catch up with available fertilizer. According to the law of vegetable growth, after the vegetables are harmed by phytotoxicity, their growth is often inhibited. In this case, they must be watered in time and topped with water-soluble fertilizers.
Wilt
Mostly caused by the continuous rainy weather suddenly turned clear, all opened due to the shade net.
Prevention and control measures: First, in the event of a sudden and cloudy day, the seedlings should be gradually exposed to light. Do not immediately uncover all the coverings. Remove them in batches and gradually increase the light. Ventilate at the height of the shed and use the air outlet. The size of the air and the length of time it takes to exhale the temperature of the seedbed, and avoid the bottom wind. Second, shortly after the shading net was unveiled, if any seedlings are wilted, they must be covered immediately. After the seedlings return to normal, they must be re-opened. Do not water the wilt seedlings. The third is water spray and temperature control. Spray water to increase air humidity, which is open source. When the air humidity is high, the transpiration of the leaves is significantly reduced. This is the main reason why the vegetables in the shed are large in size and have large pores.
Root seedlings
Due to the root system damage caused by high humidity and high temperature, the performance of the bed is that the leaves yellow and wilting, and the seedlings stop growing.
Prevention measures: First, reduce humidity in time. Select a soil with strong permeability for seedbeds. When growing seedlings in shelters such as greenhouses or greenhouses, generally the seedbed should not be watered or watered when the drought is not obvious. When the drought is obvious, the amount of water should not be too large. The humidity in the bed is too large to cover hay ash, and proper ventilation and dehumidification are also available. The second is to give enough farmyard fertilizer. In order to raise vegetable seedlings, it is necessary to increase farmyard manure, not only to cultivate fertility, but also to cultivate strong seedlings, to improve the disease resistance of vegetable seedlings, and to increase the temperature of the soil and reduce the occurrence of diseases. The specific approach is: before the vegetable nursery, the fully cooked farmyard manure is mixed with the bed soil. The third is timely ventilation. After the cotyledon is unfolded, the cover is ventilated and a layer of fine dry soil is uniformly spread in the seedbed, and then the cover is tightly covered, which can reduce the humidity of the bed soil. Fourthly, once the roots have come off, we must promptly ventilate and discharge moisture, and we can also apply fine-dry soil and ash to absorb moisture. The fifth is cultivating loose soil. In general, most vegetable roots grow well when the soil oxygen concentration is above 8%. Due to the poor permeability of the soil and the activity of roots and microorganisms, the oxygen concentration is much lower than that of the atmosphere. Especially when the soil is compacted and accumulated, the anaerobic respiration of the roots leads to an increase in toxic substances, which is not conducive to root growth.
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