Corn phytotoxicity symptoms and remedies? How to do crop damage

Corn phytotoxicity symptoms and remedies? What should I do if the crops have phytotoxicity? The phytotoxicity refers to the fact that the crop is not properly grown or has physiological dysfunction after administration. The phytotoxicity is acute and chronic. The former showed obvious symptoms, such as burns, wilting, defoliation, falling flowers, and fruit drop, from a few hours to 3-4 days after spraying. The latter occurred after a long time after spraying, such as poor growth, leaf malformation. , late maturity and so on . Common symptoms are foliar appearance of large and small shapes, colorful spots, local tissue scorch, perforation or leaf detachment, or yellowing, chlorosis or thickening of the leaves.

The remedial measures that can be taken in the phytotoxicity of corn are mainly to improve the crop root environment, promote crop growth and enhance its resistance to stress. Tillage measures such as loose soil, increased ground temperature and soil aeration can be adopted, and some quick-acting nitrogen, phosphorus, potassium fertilizer or other micro-fertilizers can be supplemented according to the growth of the crop.

Foliar fertilization has a quick effect and is the most effective remedy for corn phytotoxicity. It can spray some plant growth regulators that promote and promote the growth of roots, especially for the growth of roots, but must be hospitalized according to the needs of crops. . In short, as long as measures are conducive to crop growth and development, it is beneficial to alleviate phytotoxicity and reduce losses.

1. For the phytotoxicity of the herbicide due to excessive dosage, it can be used for cultivating, applying a certain amount of lime powder during watering to neutralize the acidic herbicide, and strengthen field management to enhance corn resistance.

2. Combined with watering, adding urea and other quick-acting fertilizers to promote root development and regeneration; strengthen cultivating loose soil, enhance roots' ability to absorb nutrients and water, and promote plant growth and development as soon as possible. At the same time, it can also spray 1%~2% urea or 0.3% potassium dihydrogen phosphate solution on the leaf surface to reduce the damage caused by the phytotoxicity.

3. Spraying plant growth regulators, plant growth regulators have a good stimulating effect on corn growth and development, and can also use zinc, iron, aluminum and other micro-fertilizers and foliar fertilizers to promote crop growth, effectively reducing phytotoxicity. Commonly used plant growth regulators are gibberellic acid, eucalyptus vinegar, sodium nitrophenolate.

How to effectively save crop damage

The selection of pesticides for crop safety varies with the physical and chemical properties of different agents, resulting in different levels of phytotoxicity. Generally, inorganic bactericides are most likely to cause phytotoxicity, and organic synthetic bactericides are less likely to be harmful; plant bactericides are the safest and less susceptible to phytotoxicity. In the same type of medicament, the greater the water solubility of the medicament, the heavier the phytotoxicity. For example, copper sulfate has strong water solubility and is easy to produce phytotoxicity. When mixed with lime to form Bordeaux mixture, it is insoluble in water and safe for crops.

The quality of the pesticide has a great influence on the crop. For example, when the wettability of the wettable powder is poor, the powder is coarse and the sedimentation speed is fast in the water. If it is not stirred in time, the concentration of the lower part of the liquid is large, and the phytotoxicity is easily generated after spraying.

Try to choose a period of strong resistance to the general seedling and flowering period, young and long-term plants, easy to produce phytotoxicity.

Different environmental conditions, different degrees of damage, high temperature, high humidity, strong light, the activity of the agent is enhanced, the concentration is high, the metabolism of the crop is strong, the agent easily enters the implant, causing phytotoxicity. Therefore, try to avoid the noon spray on hot days.

Correctly master the application of pesticides in strict accordance with the specified concentration and dosage, and use river water or fresh water for dilution.

After taking remedial measures, strengthen management, properly apply nitrogen fertilizer and water, and promote its recovery as soon as possible.

Pharmacy treatment: The use of fungicides, insecticides, herbicides, essential protective agents, "half-day green" or guanamine 120 (first aid protection agent), when compounding bactericides, insecticides, and herbicides Amine 120 (first aid protection agent), sprayed on the crop evenly at 20-40ml/mu, the protection effect is good.

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