Herbicides have been widely used in agricultural production and have achieved significant economic and social benefits. However, due to improper use and other reasons, phytotoxicity has occurred from time to time, resulting in crop yield reduction or no harvest. Once the herbicide phytotoxicity occurs, different degrees of loss will be inevitable. Even if measures are taken to prevent and control, it will not cure the symptoms. How to avoid or eliminate the occurrence of herbicide phytotoxicity is a technical problem that many farmers are eager to understand.
First, do not use herbicides for sensitive crops. Some crops are extremely sensitive to one or a certain type of herbicide. Do not say direct spraying, even if the operation is accidentally dropped on the stems and leaves of the crops, or the herbicides are not cleaned. The sprayer will spray other liquids, which will also cause phytotoxicity to the crops, causing them to stop growing or causing distortion, which will cause the plants to die. Gramineous crops such as rice, wheat, and millet are sensitive to stabilizing and covering grass, and are easy to cause phytotoxicity. They must be avoided or used in large areas after trials to determine the optimum concentration. Crops such as peanuts, melons, soybeans, cotton, and rapeseed are extremely sensitive to herbicides such as 2,4-D and dimethyltetrachloride, which are likely to cause phytotoxicity and should be paid special attention.
Second, the use of herbicide methods should be appropriate There are many types of herbicides, the use of different methods, to see the instructions on the label before use, do not use it at will, or easy to cause phytotoxicity. When using poisonous soil to control weeds in rice fields, if the powder is inadvertently applied to the leaves, it is easy to cause phytotoxicity. Herbicide such as glyphosate can cause serious phytotoxicity if it is contaminated on seeds.
Third, to avoid the use of herbicides in the sensitive period of crop growth The germination, germination and heading and flowering stages of crops are sensitive to herbicides, and the use of herbicides can easily cause phytotoxicity. If the herbicidal ether is applied during the budding period of rice, a large amount of pyrolysis will be caused.
4. Herbicides should be kept safely to avoid misuse. If the herbicides are not properly stored, they may cause failure, trademarks may fall off or be lost, and labels may not be visible due to moisture. The trademark on the herbicide packaging has a detailed description of the performance, use method, composition, action characteristics, precautions and expiration date of the herbicide, and is an important basis for the use of herbicides. If you do not use the medicine according to the instructions on the trademark, it may cause phytotoxicity.
5. Do not blindly mix herbicides. The mixed use of herbicides has strict requirements. It should not be used indiscriminately. Otherwise, it will not only play a synergistic effect, but also cause serious phytotoxicity. When the enemy is mixed with organophosphorus or carbamate pesticides, it is easy to cause phytotoxicity. It is not uncommon for herbicides to be used indiscriminately to cause phytotoxicity. It must be taken seriously.
Sixth, the concentration of the drug should be appropriate. The phenomenon of increasing the concentration of herbicides is common. The resulting phytotoxicity is also the most, and the loss is also the biggest. The concentration of herbicides used is strictly required. Do not increase or decrease the concentration (especially increase the concentration), otherwise it will easily cause phytotoxicity or reduce the efficacy. When the wheat field is weeded, the superstar's dosage is too large to cause phytotoxicity.
Seven, do not ignore the herbicide residue phytotoxicity Some herbicides can remain in the soil for a long time, causing phytotoxicity to the squat crop. When weeds are used in wheat field weeding, the residue often causes the post-glutinous corn to be phytotoxic, resulting in smaller, thinner, discolored and reduced chlorophyll, shorter plants, and lower seed setting rate.
8. The external environment has an impact on the use of herbicides. The external environmental conditions are also closely related to the production of herbicides. Temperature, humidity, wind, light, rain, snow, etc. all affect the efficacy of herbicides. Many herbicides are used at high temperatures and can cause phytotoxicity even when used in accordance with the instructions for use. When the wheat field is weeded with green meron, if it encounters low temperature, wind and rain and cold current, it is easy to cause phytotoxicity.
9. Do not use herbicides with poor quality of herbicides that are problematic. It is easy to produce phytotoxicity. You must purchase herbicides from regular manufacturers with complete procedures, good market response and guaranteed quality. Do not buy no factory name or site. , "three no products" on the date of production and products whose quality is difficult to guarantee, so as not to cause phytotoxicity. Wettable powder herbicides such as processing quality are not in place, large particles, poor wettability, poor suspension, etc., easy to produce precipitation after adding water, affecting the uniformity of spray and concentration of liquid, can cause phytotoxicity.
10. Clean the application tool. Tools such as sprayers that have used herbicides must be cleaned in time before spraying other pesticides. Otherwise, it may cause phytotoxicity.
Source: Scientific breeding
First, do not use herbicides for sensitive crops. Some crops are extremely sensitive to one or a certain type of herbicide. Do not say direct spraying, even if the operation is accidentally dropped on the stems and leaves of the crops, or the herbicides are not cleaned. The sprayer will spray other liquids, which will also cause phytotoxicity to the crops, causing them to stop growing or causing distortion, which will cause the plants to die. Gramineous crops such as rice, wheat, and millet are sensitive to stabilizing and covering grass, and are easy to cause phytotoxicity. They must be avoided or used in large areas after trials to determine the optimum concentration. Crops such as peanuts, melons, soybeans, cotton, and rapeseed are extremely sensitive to herbicides such as 2,4-D and dimethyltetrachloride, which are likely to cause phytotoxicity and should be paid special attention.
Second, the use of herbicide methods should be appropriate There are many types of herbicides, the use of different methods, to see the instructions on the label before use, do not use it at will, or easy to cause phytotoxicity. When using poisonous soil to control weeds in rice fields, if the powder is inadvertently applied to the leaves, it is easy to cause phytotoxicity. Herbicide such as glyphosate can cause serious phytotoxicity if it is contaminated on seeds.
Third, to avoid the use of herbicides in the sensitive period of crop growth The germination, germination and heading and flowering stages of crops are sensitive to herbicides, and the use of herbicides can easily cause phytotoxicity. If the herbicidal ether is applied during the budding period of rice, a large amount of pyrolysis will be caused.
4. Herbicides should be kept safely to avoid misuse. If the herbicides are not properly stored, they may cause failure, trademarks may fall off or be lost, and labels may not be visible due to moisture. The trademark on the herbicide packaging has a detailed description of the performance, use method, composition, action characteristics, precautions and expiration date of the herbicide, and is an important basis for the use of herbicides. If you do not use the medicine according to the instructions on the trademark, it may cause phytotoxicity.
5. Do not blindly mix herbicides. The mixed use of herbicides has strict requirements. It should not be used indiscriminately. Otherwise, it will not only play a synergistic effect, but also cause serious phytotoxicity. When the enemy is mixed with organophosphorus or carbamate pesticides, it is easy to cause phytotoxicity. It is not uncommon for herbicides to be used indiscriminately to cause phytotoxicity. It must be taken seriously.
Sixth, the concentration of the drug should be appropriate. The phenomenon of increasing the concentration of herbicides is common. The resulting phytotoxicity is also the most, and the loss is also the biggest. The concentration of herbicides used is strictly required. Do not increase or decrease the concentration (especially increase the concentration), otherwise it will easily cause phytotoxicity or reduce the efficacy. When the wheat field is weeded, the superstar's dosage is too large to cause phytotoxicity.
Seven, do not ignore the herbicide residue phytotoxicity Some herbicides can remain in the soil for a long time, causing phytotoxicity to the squat crop. When weeds are used in wheat field weeding, the residue often causes the post-glutinous corn to be phytotoxic, resulting in smaller, thinner, discolored and reduced chlorophyll, shorter plants, and lower seed setting rate.
8. The external environment has an impact on the use of herbicides. The external environmental conditions are also closely related to the production of herbicides. Temperature, humidity, wind, light, rain, snow, etc. all affect the efficacy of herbicides. Many herbicides are used at high temperatures and can cause phytotoxicity even when used in accordance with the instructions for use. When the wheat field is weeded with green meron, if it encounters low temperature, wind and rain and cold current, it is easy to cause phytotoxicity.
9. Do not use herbicides with poor quality of herbicides that are problematic. It is easy to produce phytotoxicity. You must purchase herbicides from regular manufacturers with complete procedures, good market response and guaranteed quality. Do not buy no factory name or site. , "three no products" on the date of production and products whose quality is difficult to guarantee, so as not to cause phytotoxicity. Wettable powder herbicides such as processing quality are not in place, large particles, poor wettability, poor suspension, etc., easy to produce precipitation after adding water, affecting the uniformity of spray and concentration of liquid, can cause phytotoxicity.
10. Clean the application tool. Tools such as sprayers that have used herbicides must be cleaned in time before spraying other pesticides. Otherwise, it may cause phytotoxicity.
Source: Scientific breeding
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