Do not let phytotoxicity "drill holes"
After a winter season, vegetables often have weak stems and leaves, and their stress resistance is reduced. Diseases often occur. Many vegetable farmers increased their spraying efforts before the Spring Festival to prevent diseases. Some greenhouse diseases have already occurred, and vegetable farmers are eager to treat diseases. The problem of increasing drug concentration and increasing the number of medications is even more prominent, resulting in frequent occurrence of phytotoxicity in the shed after the Spring Festival. After the occurrence of phytotoxicity, how to relieve the phytotoxicity of vegetables to restore growth as soon as possible, to avoid serious reduction in yield, is a concern for vegetable farmers.
First, ease the injury
After the occurrence of phytotoxicity in vegetables, many cells or tissues died of dryness, stop growing, and weakened. Different remedies should be taken according to different manifestations.
For overdose or repeated drug use, once found, immediately rinse with plenty of water, spray 2 or 3 times repeatedly, try to wash away the pesticide on the surface of the vegetables, which is a medicine for pesticides with poor systemic absorption. The harm effect is better, but the effect of the strong systemic drug is not good. If the leaves or cells are dead or dry, they should be removed from the areas with severe phytotoxicity or old leaves. On the one hand, the absorption of systemically absorbed drugs can be alleviated, and on the other hand, infection by pathogens can be avoided. Finally, mitigation drugs can be sprayed to reduce the transpiration of vegetables by spraying 2 to 3 aspirin per 15 kg of water to reduce the phytotoxicity, and spraying plant growth regulators such as Yunda 120, nucleotides and love overdose. Promote the rapid recovery of vegetables.
For phytotoxicity caused by the use of azole pesticides, the temperature of the greenhouse can be appropriately increased and the amount of water and fertilizer can be increased to promote absorption. At the same time, 6000 times of the liquid is used for overdose, 2000 times of liquid is 4% of gibberellin, and 1500 times of liquid brassin is contained. Growth promoters promote vegetative growth. For the hormone poisoning caused by the excessive amount of traditional Chinese medicines for flowering, spraying, or flowering, it can be sprayed with 2000 times of 4% gibberellin; the problem of excessive use of gibberellin can be sprayed with 1500 times 15% paclobutrazol. The formation of the plant's own gibberellin, and sprayed with anti-dropping hormone, to alleviate the symptoms of hormone poisoning.
For phytotoxicity caused by herbicides, such as contact-killing herbicides, such as propanil, herbicidal ether, etc., it only harms the organs of vegetables that are in contact with it, and it is only necessary to remove the site where the phytotoxicity occurred.
Second, plant rejuvenation
After the occurrence of phytotoxicity, it will have great influence on the vegetative growth and reproductive growth of vegetables. At this time, we should first pay attention to establishing vegetative growth advantages and cultivate strong plants.
First, remove the flowers and fruits from the plants in time to reduce nutrient consumption. The photosynthetic efficiency of the injured leaves is reduced, nutrition is insufficient, young fruit is difficult to sit on, and there are many malformed fruits. It is recommended that they be removed in time. After harvesting cucumbers, the flowers and melons in the internodes should be removed in time, especially near the growing point. For the particularly delicate plants, the large melons must be removed.
Second, the greenhouse must ensure sufficient light and temperature and humidity, promote the formation of photosynthetic products, and ensure the growth point and the rapid growth of the root system. After the victimization, the temperature can be gradually increased, and the temperature is increased by 2° C. to 3° C. on the basis of the suitable temperature, and the adequate ventilation of the carbon dioxide in the shed is ensured, and the vegetative growth of the plant is promoted as soon as possible.
Again, timely replenish fertilizer. It is suggested that a large number of element fertilizers and rooted roots should be used for the rotation of fertilizers, supplementing nutrients and promoting root growth. At this time, watering should pay attention to avoid flooding and lead to roots "slow."
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