Cultivated plants in the field of dense weeds, artificial weeding labor costs, chemical herbicide weeding is simple and labor-saving, reducing economic input, the effect is significant. In order to reduce the phytotoxicity and pollute the environment, the following six points should be noted.
First, pay attention to the weed seeds germination and just sprouting, sensitive to the drug, the best effect. The herbicide for dry soil is generally used twice. The first time the sowing site is in the seedlings before sowing, the cultivation site is most suitable when the weed seeds start to sprout or the young grass is just unearthed. The second application period should be based on the length of the drug and the weeds in the field, usually in the middle of July.
Second, pay attention to the amount of drug used to affect the herbicidal effect, so it should be appropriate; generally should refer to the instructions for use of the drug, but the amount of drug should vary according to environmental conditions. The administration of the same agent in the same area is also different with the change of external factors, and it is necessary to be flexible in time and place. When the weeds are tall, the cultivated plants are strong, and the clay is used, the dosage can be larger; when the temperature is low, the dosage should be larger; the application of the sandy loam should be appropriately reduced to avoid phytotoxicity.
Third, pay attention to the method of treatment of weeds by dry herbicides, stem and leaf treatment and soil treatment. There are three methods of spraying, poisonous soil and pouring. Stem and leaf treatment is to spray the medicament on the stems and leaves, touch or pass through the leaves to infiltrate the plants to kill the weeds, usually by spraying. The soil treatment allows the agent to directly contact the soil and kill the weeds, and the spray method, the pouring method, and the poisonous soil method can be used. Generally, different methods are alternately selected according to the characteristics of weeds, cultivated plants growth and management.
Fourth, pay attention to the environment and safety to choose sunny application, there should be no heavy rain within 12-48 hours after application. Low temperature or high soil moisture or low air humidity, the effect is poor. The direction of the spray should be downwind or beveled to the wind direction. When the leeward sprays, it should be moved backwards. It is strictly forbidden to spray the medicine on nearby crops to produce phytotoxicity.
5. Pay attention to the rational selection and alternate use of herbicide weeding, trifluralin, lasso, acetochlor to kill grasses; Guoer, dry grass can only remove pre-emergence or early post-emergence weeds, unable to control the age Weeds; thatchgrass mainly prevent narrow-leaf weeds, and Cimajin has a good effect on annual shallow root weeds. In addition, the long-term use of a single herbicide increases the number of microorganisms that decompose the agent in the soil, thereby shortening the residual period and affecting the efficacy. Therefore, different types of herbicides should be used alternately.
6. Pay attention to reasonable mixing. Most of the herbicides currently on the market are single. The herbicide range of various herbicides is limited. Therefore, it is necessary to mix two or more herbicides. But the following principles must be mastered:
1 killing herbicide combinations of different objects;
2 quick-acting combined with slow-acting herbicides;
3 combination of internal absorption type and contact type;
4 long-term and short-term combination;
5 The combination of large diffusivity and low diffusivity in the soil. For example, herbicide ether plus chlorpyrifos plus pentachlorophenol sodium herbicide rate can generally reach 100%.
First, pay attention to the weed seeds germination and just sprouting, sensitive to the drug, the best effect. The herbicide for dry soil is generally used twice. The first time the sowing site is in the seedlings before sowing, the cultivation site is most suitable when the weed seeds start to sprout or the young grass is just unearthed. The second application period should be based on the length of the drug and the weeds in the field, usually in the middle of July.
Second, pay attention to the amount of drug used to affect the herbicidal effect, so it should be appropriate; generally should refer to the instructions for use of the drug, but the amount of drug should vary according to environmental conditions. The administration of the same agent in the same area is also different with the change of external factors, and it is necessary to be flexible in time and place. When the weeds are tall, the cultivated plants are strong, and the clay is used, the dosage can be larger; when the temperature is low, the dosage should be larger; the application of the sandy loam should be appropriately reduced to avoid phytotoxicity.
Third, pay attention to the method of treatment of weeds by dry herbicides, stem and leaf treatment and soil treatment. There are three methods of spraying, poisonous soil and pouring. Stem and leaf treatment is to spray the medicament on the stems and leaves, touch or pass through the leaves to infiltrate the plants to kill the weeds, usually by spraying. The soil treatment allows the agent to directly contact the soil and kill the weeds, and the spray method, the pouring method, and the poisonous soil method can be used. Generally, different methods are alternately selected according to the characteristics of weeds, cultivated plants growth and management.
Fourth, pay attention to the environment and safety to choose sunny application, there should be no heavy rain within 12-48 hours after application. Low temperature or high soil moisture or low air humidity, the effect is poor. The direction of the spray should be downwind or beveled to the wind direction. When the leeward sprays, it should be moved backwards. It is strictly forbidden to spray the medicine on nearby crops to produce phytotoxicity.
5. Pay attention to the rational selection and alternate use of herbicide weeding, trifluralin, lasso, acetochlor to kill grasses; Guoer, dry grass can only remove pre-emergence or early post-emergence weeds, unable to control the age Weeds; thatchgrass mainly prevent narrow-leaf weeds, and Cimajin has a good effect on annual shallow root weeds. In addition, the long-term use of a single herbicide increases the number of microorganisms that decompose the agent in the soil, thereby shortening the residual period and affecting the efficacy. Therefore, different types of herbicides should be used alternately.
6. Pay attention to reasonable mixing. Most of the herbicides currently on the market are single. The herbicide range of various herbicides is limited. Therefore, it is necessary to mix two or more herbicides. But the following principles must be mastered:
1 killing herbicide combinations of different objects;
2 quick-acting combined with slow-acting herbicides;
3 combination of internal absorption type and contact type;
4 long-term and short-term combination;
5 The combination of large diffusivity and low diffusivity in the soil. For example, herbicide ether plus chlorpyrifos plus pentachlorophenol sodium herbicide rate can generally reach 100%.
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