Corn has already entered the late growth stage. It will be almost a month after the new corn is on the market. At this time, it seems a bit late for the corn seedlings to be weeded, but it is not too much to discuss with everyone here.

What is the best herbicide after corn seedling?

There are many corn herbicides in the market, and various herbicides are also dazzling for the growers to pick their eyes. However, in general, the corn seedling herbicides that are currently popular on the market are nicosulfuron, nicosulfuron, mesotrione, oxafluridone, acetochlor, and atrazine. However, there are many more herbicides in these categories: amides, triazines, sulfonylureas, and phenoxycarboxylic acids. It can only be said that each herbicide is good or bad, and it is not perfect. When using it, it is necessary to make comprehensive considerations based on the situation of the corn in the field and the weed situation.

Common corn herbicide

First, let's first look at the types of major weeds in corn fields. There are three main types of weeds commonly found in corn fields: broadleaf, grass, and sedge. Common species of broadleaf are purslane, Solanum nigrum, and convolvulus, and grasses are foxtail and goosegrass. The last type is more common.

And in recent years, the weeds of Xiangfuzi have an increasing trend. Especially summer corn, because the rain is hot during the growth period of corn is very easy to form grass shortage. This also shows the importance of weeding in the corn seedling stage.

Here, let's take a look at the advantages and disadvantages of various herbicides.

The first is an amide herbicide. This type of herbicide is not suitable for use in corn seedlings because the herbicide is generally used in soil treatment to stabilize the herbicide. However, seedling corn seedlings have grown, weeds have also grown, and all such herbicides have little effect at seedling stage. The most common herbicides of this type of herbicide are alachlor, acetochlor, butachlor and the like. It is more suitable for destroying grass weeds in corn fields, but the effect on broadleaf grass and sedge is not obvious.

The second type of triazine herbicide, which is similar to the above-mentioned amide herbicide, is that the herbicide is also used in the soil type, but the herbicide is mainly broad-leaved. The weed effect of the class is significant. The more common herbicides are cyanazine, atrazine and the like.

The third type of sulfonylurea herbicides, it should be said that this type of herbicide is more suitable for weeding in corn seedlings, because its use is more flexible, soil and stems and leaves can be used. The safety of corn is relatively high. Common varieties are nicosulfuron, sulfonamide and the like. Here is a more commonly used nicosulfuron which is a systemic herbicide. It takes a certain amount of time to kill the weeds. It is generally about 20 days after use to see weeds die. It has effects on weeds and broadleaf weeds.

The fourth type is a phenoxycarboxylic acid herbicide. This herbicide is a systemic herbicide similar to a sulfonylurea herbicide. It has a broad spectrum of herbicides and is effective against broadleaf grass and sedge. Commonly there are 2,4-D butyl ester, 2 methyl 4-chloro and the like.

In addition to the four common types of corn herbicides mentioned above, we are the more common glyphosate. Glyphosate is an organophosphorus herbicide. Glyphosate is a herbicide herbicide, so it is more lethal. Therefore, corn weeding does not use glyphosate, which is prone to phytotoxicity.

The herbicides mentioned above are all herbicides in a single dose. There are many mixed herbicides on the market, and the herbicidal effect is also good. It will not be described in detail here.

However, at present, the herbicides commonly used for weeding in corn seedlings are more than nicosulfuron, and then the herbicides of the mixed preparations, such as nicosulfuroxazole, mesotrione and atrazine.

Corn weeding time selection

Corn weeding can generally be carried out at three time points, one is to weed the grass before the seedlings, the other is the weeding in the seedling stage, which is often said to be in addition to the grass, and the other is the weeding in the middle and late stages of corn growth, which farmers often call In addition to big grass. The three most commonly used methods of weeding are the weeding after corn seedlings. That is to say, when the corn seedlings grow to two to six leaves, the corn in the "three leaves and one heart" at this stage can be said to be the best time for the corn to use the herbicide, and the resistance of the corn is more enhanced.

Finally, the above herbicides can only be used for ordinary corn, sweet corn, waxy corn, etc. are not suitable for use, and are susceptible to phytotoxicity.

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