Weeding is a very important part of the development of the planting process. If it is not weeded, it will take the land nutrients and affect the growth of corn. Weeding techniques are also diverse. Today, Xiaobian will introduce the chemical weeding technology of cornfields for reference by the majority of growers.

1, fine land preparation

The quality of the soil preparation is not good, the soil is uneven or uneven, and the liquid can not be sprayed evenly. When the weed shoots are unearthed, the film cannot be killed, which affects the herbicidal effect. Therefore, before applying the medicine, the ground should be flattened and thinned, and it is easy to form a uniform soil layer after the medicine.

2, suitable application

According to different weeding methods, choose the appropriate application time to ensure the herbicidal effect and avoid the occurrence of phytotoxicity.

In the case of better soil conditions, it is preferred to carry out soil closure before the sowing of the corn. Not only the herbicidal effect is good, but also the safety of the corn can be enhanced. The weeds 2 leaf stage is the most sensitive period for weed shoots to herbicides. At this time, herbicide application is good. The use of soil closed weeding should be selected after rainy days or watering, that is, when the soil is wet, it is beneficial to the formation of the film to improve the control effect. In order to avoid phytotoxicity of crops other than corn fields, it is necessary to apply the windless weather and lower the nozzle to prevent the mist from drifting away.

Stem and leaf treatments should be applied in the 3~5 leaf stage of corn, 2~4 leaves of weeds, and most weeds should be applied when they are out.

Directional weeding between rows of corn should be carried out with protective spray. After 9 leaves of corn, the corn plants should be avoided as far as possible to achieve the best herbicidal effect on corn safety.

3. Soil moisture

The effect of soil-blocking herbicides on weeds is mainly through the absorption of the agents by weed shoots and radicles, inhibiting the growth of young shoots and young roots, and causing weeds to die in high-yield fields. Certain soil moisture is conducive to improving the herbicidal effect. If the continuous dry weather is encountered during the medication phase, the herbicidal effect will be greatly reduced, so the amount of water should be increased when applying the medicine.

4, uniform application

Most cornfield chemical herbicides are sprayed with agricultural vehicles. The speed of the corn must be slow and as fast as possible. It can not be sprayed in a windy day, so that the herbicide effect can be ensured evenly.

5, pay attention to the problem of physiology

Choose herbicide varieties, strictly control the dosage, and apply the medicine at appropriate time to avoid drifting phytotoxicity.

6, commonly used herbicides in corn fields

Herbicide commonly used to control annual monocotyledonous weeds

(1) 62% B • 莠 • Ding Ding suspoem 250~300 ml / mu;

(2) 50% atrazine suspoemulsion 250~350 ml/mu;

(3) 90% acetochlor EC 150~200 ml/mu.

7. Current weeding techniques in corn fields

(1) Before sowing until the 3rd leaf stage of corn: In the case of better soil soil conditions, it is preferred to carry out soil closure before seeding of corn. Not only the herbicidal effect is good, but also the safety of corn is enhanced.

1 per acre with 90% acetochlor EC 150~200 ml or 72% propisochlor 150~250 ml, plus 38% atrazine 300 ml or 50% atrazine 200 ml;

262% B • 莠 • drip emulsion (easy to seal the end, one pass) 250~300 ml / mu;

362% B • 莠 • drip emulsion 250 ml / acre + 90% acetochlor EC (grass block) 100 ml.

For high yields of corn, weeding is important. I hope that the above contents will help the majority of growers, do a good job in weeding, and promote high yield of corn.

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