Herbicides have been widely used in agricultural production, and have achieved significant economic and social benefits. However, due to improper use and other reasons, the occurrence of drug hazards from time to time, resulting in crops reduced or no harvest. Once the herbicide damage occurs, varying degrees of loss will be unavoidable. Even if measures are taken to prevent and control this, it will be a temporary solution. How to avoid or eliminate the occurrence of herbicide harm is a technical problem that the majority of farmers are eager to learn.
First, do not use herbicides in sensitive crops. Some crops are extremely sensitive to certain types or types of herbicides. Not to mention direct spraying, even if careless droplets fall on the crop stems and leaves, or do not clean the herbicides. Spraying other sprays on the sprayer can also cause phytotoxicity to the crops, stop them from growing or cause distortion, and cause the plants to die. Rice, wheat, millet and other gramineous crops are relatively sensitive to stable killing, grass cover, etc., and are prone to cause phytotoxicity. They must be avoided, or used after trials to determine the optimum concentration. Peanuts, melons, soybeans, cotton, and rapeseeds are extremely sensitive to 2,4-dichloromethane, tetracycline, and other herbicides, and can easily cause phytotoxicity. Special attention should be paid.
Second, the use of herbicides to a variety of appropriate herbicides, the use of methods are different, to see the instructions on the use of labels before use, must not be used arbitrarily, otherwise easily lead to injury. When poisonous soils are used to control weeds in paddy fields, if they accidentally stick the powder on the leaves, they are prone to injury. If herbicides such as glyphosate are contaminated on the seeds, they may cause serious injury.
Third, to avoid the use of herbicides in the sensitive period of crop growth during the germination period, bud stage and heading and flowering stage are sensitive to herbicides, then herbicides can easily cause injury. In the budding stage of rice, if herbicide ether is applied, it will cause a lot of sprouts.
Fourth, the herbicide should be properly kept, to avoid misuse of herbicides if poorly kept, easily lead to failure, loss or loss of the trademark, the label can not see because of moisture and other phenomena. Herbicides on the packaging of the trademark and other properties of the herbicide, the use of methods, pharmaceutical ingredients, features, precautions and expiration date, etc. have a more detailed description, is the use of herbicides important basis. If you do not follow the instructions on the trademark, it is easy to cause injury.
Fifth, do not blindly mix the herbicide herbicide mixed with strict requirements, can not be arbitrary with random use, otherwise it will not only play a synergistic effect, but also easy to produce serious injury. The use of a mixture of propanil, organophosphorus, and urethane pesticides tends to produce phytotoxicity. It is not uncommon for herbicides to be misused to cause phytotoxicity. They must be taken seriously.
Sixthly, the concentration of herbicides used to increase the concentration of herbicides is relatively common, resulting in the greatest number of phytotoxicity and loss. There are strict requirements on the concentration of herbicides used, and it must not be used to increase or decrease the concentration (especially to increase the concentration of use), otherwise it may easily cause phytotoxicity or reduce efficacy. When the wheat field is weeding, the super star's dosage is too large to cause phytotoxicity.
Seven, do not ignore herbicide residue damage Some herbicides can remain in the soil for a long time, produce phytotoxicity on the next crop. In the use of metsulfuron for weeding in wheat fields, residues often cause damage to post-cultivated corn, resulting in smaller, thinner leaves, discoloration, reduced chlorophyll, dwarf plants, and reduced seed setting rate.
Eight, the external environment has an impact on the use of herbicides The external environmental conditions also have a lot to do with the emergence of herbicide phytotoxicity. Temperature, humidity, wind, light, rain, and snow all affect the efficacy of herbicides. Many herbicides are used at high temperatures and even when used according to the instructions for use, they can cause injury. When the wheat field is used for weeding with green mellon, if it encounters low temperature, wind and rain, and cold current, it is easy to produce phytotoxicity.
Nine, do not use the herbicide with poor quality herbicide quality problems are prone to phytotoxicity, we must purchase procedures complete, market response, quality assurance of the regular manufacturers of herbicides, do not buy without factory name, site The “three non-products†of the production date and the products whose quality is difficult to guarantee will not cause phytotoxicity. Wettable powder herbicides, such as poor quality of processing, large particles, poor wettability, poor suspension, etc., are prone to precipitation after water is added, affect the uniformity of the spray and the concentration of the liquid, and can cause phytotoxicity.
Ten, to clean the spraying tools used herbicide sprayer and other tools, must be cleaned in a timely manner before they can be sprayed with other pesticides, otherwise it may also cause injury.
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