1. Master the spray time

The whole field sprayed corn field should be within 5 leaves. At this time, the corn has high resistance, is not prone to phytotoxicity, has good weeding effect and high safety; spray after 6 leaves, lower the sprayer and spray around the corn trees. Prevent drug damage caused by liquid medicine. It is best to spray the pesticide after 6 o’clock in the evening, in the absence of wind. At this time, the temperature is lower, the humidity is higher, and the liquid stays on the leaves of the weeds for a longer time. The weeds can fully absorb the herbicide ingredients to ensure In order to improve the weeding effect, the evening medication can also significantly improve the safety of corn seedlings and prevent phytotoxicity.

2. See the grass size spray

When spraying corn post-emergence herbicides, farmers have a misunderstanding that the smaller the weeds, the lower the resistance, and the easier the grass is to kill. In fact, this is not the case, because the grass is too small and there is no area where the medicine is applied, and the weeding effect is not ideal. The best grass age is from 2 leaves, 1 heart to 4 leaves, 1 heart. At this time, the weeds have a certain area of medicine, the weed resistance is not large, and the weeding effect is remarkable.

3. Spraying method

The amount of medicine used per mu is 15-30 kg of water. When spraying, adhere to the principle of grass spraying, spray carefully, and save medicine and time.

4. Herbicide type

The single dose is generally based on nicosulfuron, and the compound formulation is mainly added with atrazine. When using pesticides, it must be proportioned in accordance with the medication instructions. The specific types of compound medication mainly include mesotrione + atrazine, nicosulfuron + atrazine, mesotrione + propisochlor + atrazine.

5. Pay attention to phytotoxicity caused by improper use of herbicides

1) Nicosulfuron is suitable for dent, half dent and hard kernel corn.

2) After spraying nicosulfuron herbicide, if the temperature is lower than 10oC for 2 days, the corn metabolism is slow, and phytotoxicity can occur.

3) Nicotinsulfuron pesticides cannot be mixed with organophosphorus pesticides, or the use of organophosphorus pesticides is prohibited within 7 days before and after the nicosulfuron spray.