Corn herbicide is used to prevent corn weeds and avoid the effects of corn weeds on the corn yield. The corn herbicides are divided into pre-emergence herbicides and post-emergence herbicides. The corn is closed to herbicides and seedlings. Which effect is better after the herbicide? Let's introduce Xiaobian for everyone.
Corn is a good herbicide and post-emergence herbicide.
Corn-blocked herbicides mainly refer to crops before planting (or before transplanting), or before crops are planted, and soil spray treatment is used to kill and kill unseeded weeds. Such herbicides include amides of acetochlor and fines. Metoclopramide, atrazine of triazobenzene, etc., can control a variety of annual grasses and some small-leaf broad-leaved weeds in the field.
The best spraying time for corn post-emergence herbicides is corn 2 to 5 leaf stage. At this time, the corn is highly resistant and is not susceptible to phytotoxicity. 5 leaves can be sprayed in the whole field before the leaves, spray after 6 leaves, to lower the nozzle, spray around the corn, to prevent the drug from causing damage. Due to drought and low temperature in the northern spring corn field, the growth of corn is slow and the emergence of weeds is not uniform. When the weeds are out of the seedlings, the corn has exceeded the 5-leaf stage; some of the first application of the drug is not effective, and the use of nicotinic acid is again used. Sulfuric acid is easy to cause phytotoxicity; it is easy to cause phytotoxicity if it is applied too early or too late.
If there is no application or soil sealing effect in this period, you can choose to use the post-emergence herbicide to control the stem and leaf spray of the emerged weeds, and the control effect is OK.
Note on the use of corn herbicides:
1. Perform constant spray according to the prescribed dosage. Do not increase the dosage.
2. Use the "second dilution method", first make up the mother liquid, then spray evenly on the water.
3. The general use of corn post-emergence herbicide should be in the period after the visible leaves of the corn leaves and before the leaves of the visible leaves. If the drug is used in the 5-7 leaf stage, it should be used between the corn rows to prevent the liquid from being sprayed into the heart leaf.
4. Some corn post-emergence herbicides are sensitive to sweet corn, seeding, and inbred lines. Do not use. It should be used in strict accordance with the herbicide label instructions.
5. Strictly control the period of application. Soil sealing treatment should be carried out within 3 days after corn sowing; post-emergence stem and leaf treatment should be in the 3-5 leaf stage of maize, and the effect of premature application is poor (annual weeds are unearthed)
6. After the soil is closed, the human and animal shall not enter the ground within one week, so as not to damage the membrane and reduce the control effect.
7. Corn treated with organophosphorus agents is sensitive to post-emergence herbicides. The interval between the two drugs is at least 7 days.
8. Use a motorized sprayer to apply the medicine. Do not increase the dose without authorization. Do not repeat the spray.
9. Before using the herbicide, pay attention to cleaning the sprayer sprayed with organophosphorus pesticides .
10. After 4 pm, the effect is good, and the high temperature weather (temperature over 35 °C) is avoided.
More pesticide knowledge , please pay attention to China Pesticide Network
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