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During the growth period of corn, many weeds will appear, including broad-leaf grass, sharp-leaf grass, sedge, etc. Some weeds are easier to control, while others are difficult to control. According to the different conditions in different regions, there will be significant differences in the choice of herbicides, because the weed conditions and resistance are different.

In this article, there are many kinds of weeds in corn fields , including Barnyardgrass  ，Green bristlegrass   Crabgrass goosegrass，Sedge ,Dayflower, Lamb's-quarters ,Purslane, Copperleaf herb, Volunteer wheat seedlings,Goosegrass Abutilon theophrasti Medicus，Calystegia hederacea，Cephalanoplos segetum，Cocklebur，F(xiàn)ield bindweed，Nutgrass flatsedge, etc.

At present, from the perspective of corn post-emergence herbicides, Nicosulfuron and Mesotrione are used more frequently and occupy a large share in the market. In addition, there are other formulations (not introducing non-selective herbicide).

Single herbicides：

1.2,4-D: it is relatively cheap and has high activity. It is mainly used to control broadleaf weeds, but its safety is poor. If bad weather or uneven application occurs during the application process, it may cause pesticide damage. In addition, the effective period is short, so it is not the first choice.

2. Dicamba: A systemic, hormone-based herbicide that mainly controls broadleaf weeds. However, in actual use, not many farmers use single herbicides. Generally, it is used in combination with Nicosulfuron.

3. Rimsulfuron: It can control broadleaf weeds and sharp-leaf weeds. It is generally used in the 3-5 leaf stage after seedlings (the control effect of nutgrass flatsedge is poor). In actual use, it is mostly used in spring corn fields. It is not recommended to use it in summer corn, because rimsulfuron is prone to phytotoxicity when it encounters high temperatures. If you want to use it in summer corn fields, you need to spray it in a directional manner.

4. Thifensulfuron-methyl: It is mainly used to control broadleaf weeds, but after using it in recent years, from the actual effect, its control effect and safety are relatively general.

5. Flumetsulam: This formula may not be seen much on the market. It is mainly used to control broadleaf weeds. In drought or low temperature conditions, it can also have a good control effect after application, but there are residues. It is not recommended to plant cruciferous vegetables and broadleaf vegetables in the next crop.

6. Nicosulfuron: It is used to control annual grass weeds and broadleaf weeds. It is a commonly used formula for post-emergence herbicides in corn fields. It has a wide spectrum of weed control, good effect, and is relatively stable. It can eradicate weeds and is relatively safe. However, the weeds die relatively slowly. Under low temperatures, it is normal for the weeds to die 15-20 days after spraying.

7. Mesotrione: It is also a formula with more users. It controls broadleaf weeds and some sharp-leaf weeds in corn fields. Compared with Nicosulfuron, it kills weeds quickly, but weeds are prone to rebound and the roots are not completely killed.

2.Compound Herbicides:

1.Nicosulfuron + atrazine,

2.Mesotrione + atrazine,

3.Nicosulfuron + mesotrione + atrazine.

These three are relatively more popular.

Next, there are

4.nicosulfuron + Propisochlor+ atrazine,

5.mesotrione + isopropylamine + atrazine,

6. acetochlor + atrazine + Flumetsulam  etc.

Generally speaking, they all have a blocking effect, mainly Let's talk about the three common compound pesticides, the advantages and disadvantages are as follows:

Nicosulfuron + atrazine:

It can seal and kill, basically all weeds in corn fields can be controlled, and the killing effect is good, but the control effect of reeds and Cyperus rotundus may be average, and the price is not expensive, about 5 yuan per mu of land, the disadvantages are also obvious, the killing speed is slow, and in terms of safety, before the corn has 5 leaves, the whole field can be sprayed, after 5 leaves, either directional spray or add safety agent.

Mesotrione + atrazine:

It is similar to the above-mentioned nicosulfuron, it can seal and kill, basically all weeds in corn fields can be controlled, the control effect of reeds may be average, its killing speed is fast, but if the method of use is not right, the weeds are easy to rebound, and in terms of price, it is more expensive than nicosulfuron.

Nicosulfuron + mesotrione + atrazine   30% OD

This three compound herbicide has an improved weed control spectrum. It combines the characteristics of nicosulfuron and mesotrione. for the mesotrione and nicosulfuron is compansate each other

1）Mesotrione     broad leaved weed  and  part of  Monocotyledonous weed，   quick kill weed  ，easy rebound

2）Nicosulfuron     broad leaved weed   Monocotyledonous weed   slower kill weed  about 15-20 days ）

It not only kills weeds faster, but also prevents weeds from rebounding. It also has a certain control effect on reeds, but the price is relatively expensive

However, some friends will still ask why the same herbicide works well after being applied by neighbors, but the effect is very poor at home. This requires some precautions when using . There are mainly the following 4 points:

1. Spraying period

No matter which post-emergence herbicide is used, it is recommended to use it when the corn has 3-5 leaves and the weeds have 2-4 leaves. At this time, the weeds are not so resistant, and the weeds have basically emerged, so the control effect is good and thorough.

2. Spraying time

When spraying herbicides, the temperature should not be too high, especially for summer corn. When spraying herbicides, do not spray them at noon. It is recommended to spray them at 7-10 am or 15-18 pm to avoid the phenomenon of rapid evaporation of the liquid due to high temperature and poor control effect.

3. Spraying method

When the field is relatively dry, when spraying herbicides, it is necessary to increase the amount of water appropriately. Under normal circumstances, 30 kilograms of water per mu of land can be used with a set of medicine. When it is relatively dry, 50-60 kilograms of water per mu of land can be used, and a set of medicine is still used. The purpose is to spray evenly and thoroughly, so that the weeds can absorb more herbicide liquid and improve the control effect.

4. Mixing problem

When spraying herbicides, it is not recommended to mix them with insecticides and fungicides, especially when using nicosulfuron. Organophosphorus insecticides cannot be used for 7 days before and after to avoid the occurrence of pesticide damage.

No matter what the situation is, we must know how to buy herbicides and understand the advantages and disadvantages of different herbicides.

I hope that in the future, you can reasonably choose the herbicide that suits you according to the local conditions. This is only for your reference

All we care about is to help farmers get benefits and increase agricultural income.