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Types of herbicides, methods of use and precautions Chemical weeding in farmland is the targeted application of chemical herbicides on farmland to kill weeds and protect crops. Chemical weeding, saving labor, saving time and effort, good control effect, it is worth promoting. Herbicides application notes are:
1. Prepare and use in strict accordance with the prescribed dosage, method and procedure. Do not increase or decrease the dosage.
2, pay attention to the use of herbicides and the method of use. The herbicide used before seeding can not be used after seedling, and the soil treatment agent cannot be treated with stems and leaves.
3, the use of herbicides to avoid phytotoxicity. The use of herbicides during the sensitive period of crops can easily cause phytotoxicity in crops. Therefore, it is necessary to avoid the use of drugs during the sensitive period of crops.
4. When the herbicide is used for stem and leaf treatment, the spraying effect is best in the 2~6 leaf stage of weeds.
5. The plots for soil treatment must be ploughed and leveled, and the spray should be uniform, otherwise the effect will be reduced. Herbicide efficacy and phytotoxicity to crops are decremented in the order of sand, loam, and stickiness. Therefore, the amount of sand soil should be reduced, and the amount of sticky soil should be increased.
6, chemical control of perennial weeds, we must increase the amount of medication. Certain contact herbicides are not effective for perennial weeds and should be selected for use.
7. Herbicides should not be sprayed in high temperature, high humidity or windy weather. Generally, choose a sunny, windless or breezy weather with a temperature of 20 to 30 °C. When spraying, the direction of the nozzle should be consistent with the direction of the wind. The direction should be perpendicular to the wind direction or at an angle of not less than 45 degrees. The wind should be sprayed first, then sprayed on the wind to prevent the liquid from drifting with the wind and harming nearby sensitive crops.
8. The sprayer that sprays the herbicide must be thoroughly cleaned before loading other drugs. (Chuan Fazhen) How to use herbicides in corn fields
At present, the varieties of corn herbicides on the market are mainly pre-emergence seedlings and soil treatment (soil closure). The representative varieties are Xuanhua E, Ma Bao, and some places use acetochlor or other varieties. Soil treatment herbicides act by weed shoots and radicles, so they must be used before weed emergence or before the early weeds 2 to 3 leaf stage in order to receive better herbicidal effects.
Soil moisture and organic matter content are the main factors affecting the efficacy of the drug. The soil moisture is good, the weeds are neat, and the herbicides can be better contacted to absorb the herbicides. On the contrary, the weeding effect will decrease due to reasons such as volatilization, photolysis and absorption. The content of soil organic matter is high, which has a great influence on the herbicidal effect of soil treatment herbicides. The content of organic matter is low, the amount of pesticide used is small, and the content of organic matter is high. It is required to increase the dosage to increase the herbicidal effect. For another example, the amount of water used for weeding in the corn field after no-tillage directing corn and the land preparation in the field should be increased to reduce the impact of wheat stubble. Otherwise, the herbicidal effect is not good.
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