What is the best time for weeding in Henan? Wheat field herbicide use time? At present, the planting of wheat in our province is basically over, and the weeds in the wheat fields will slowly emerge. According to different regional medication habits, some farmers prefer to use drugs after the year, while others use herbicides before the year. Long-term practice has proved that the wheat seedling stage (mid-late November) and the greening period (late February to early March) are the best time to control weeds in wheat fields.

In the wheat seedling stage (mid-late November), on the one hand, the wheat is at the 4th or 4th leaf stage, which is more tolerant to herbicides and is less prone to phytotoxicity. In addition, most of the weeds at this time Already out, and the grass age is relatively small, the resistance to the drug is relatively small, the dosage is not too large, the weeds can be removed.

The greening period (from late February to early March) can also control weeds in wheat fields, but because the weeds are older and more resistant to drugs, it is necessary to increase the amount of drug to be effective, which increases invisibly. The cost of medication is also easy to cause phytotoxicity, so pay special attention when applying the medicine.

Use suitable herbicides and formulas

Herbicides selected for chemical weed control in wheat fields should be determined based on the main weed species and the herbicidal spectrum of the herbicide. When the weed species in the wheat field are in the same herbicide herbicide spectrum, a single herbicide can be used for control; when several weeds are mixed, such as the combination of dicotyledonous weeds and monocotyledonous weeds, several The herbicides are mixed and applied according to a certain ratio to expand the herbicidal spectrum and improve the herbicidal effect.

For the wheat field dominated by broadleaf weeds such as wormwood, leeks, maijiagong, ion grass, yarrow, and alfalfa, 10% bensulfuron-methyl WP can be used, 10 g per acre, or 75% benzene sulfonate. Long water dispersible granules, 1 gram per acre.

For wheat fields dominated by buckwheat, 70% fluzolone-sulfonate water-dispersible granules can be used, and the dosage is 3 to 4 grams per acre.

For the wheat field based on bowls of flowers, 20% flufenoxyacetic acid emulsifiable concentrate can be used, and the dosage is 50-70 ml per mu.

To look at the wheat field dominated by maiden and valerian, you can use 10.8% oxazolyl grass emulsifiable concentrate, 30-40 ml per acre, or 15% acetylene WP wettable powder, 30-40 g per acre.

The wheat field mixed with brome and broadleaf weeds can be mixed with 10% of fluzolsulfonate water dispersing granules 3~4g + 10% bensulfuron-methyl WP 10g per acre.

The above formula is 30-40 kg per acre, and is evenly sprayed by hand sprayer or sprayer.

Precautions when applying

1. Apply in the right climate.

Most herbicides are positive temperature coefficient agents. Do not apply at temperatures below 6 °C. It is best from 10:00 am to 3:00 pm, and do not drop below this temperature before and after herbicides.

It is easy to cause the herbicide to be elegant in the windy days, and the effect is not good. It may also be blown to the greenhouse crops or other crops to cause herbicide damage, so it is forbidden to use the medicine on windy days.

In addition, it is forbidden to apply herbicides in bad weather such as frost, rain, snow, hail, cold current, etc. Try not to have such bad weather before and after herbicides, so be sure to pay attention to the weather forecast.

If the soil is relatively dry when using the medicine, it should pay attention to increase the water consumption. If there is water, it will affect the efficacy of the herbicide.

2. Do not apply the medicine when the wheat seedlings are weak and the roots are bare.

Generally, the wheat field will be returned to the straw, and the plot is relatively loose. If the weather is abnormal, such as the warm winter drought year, the root system of the wheat may be too loose due to the soil and cannot be deeply ligated, and even some of the roots may be bare. This kind of wheat is very It is easy to be frostbitten and lack of water. It is the most sensitive and fragile. If the herbicide is hit at this time, it will cause certain damage to wheat.

3. Do not apply the medicine when the wheat is sick.

In recent years, wheat sheath blight, root rot, total eclipse and other species or soil-borne diseases frequently occur. Before applying herbicides, determine whether your own wheat seedlings are sick. If it is sick wheat, it is best not to apply herbicides. It is recommended to use special chemicals for seed dressing before planting wheat to prevent the occurrence of diseases.

4. Be sure to make a second dilution.

Some farmers' friends can save the herbicide directly into the sprayer, and just start looking for a branch to stir it. This method of redemption is very unscientific. Because most herbicide products will bring their own additives, the additives will play the role of penetration and synergy. They are usually thicker. If they are directly poured into the sprayer, they may sink into the bottom of the bucket, which may cause the herbicide to be opened. This may lead to two kinds of consequences: one is that the liquid is finished, and some of the herbicide is still not opened at the bottom of the barrel, causing waste; another consequence is that the concentration of the herbicide in the wheat field that was just started is small, the active ingredient Insufficient dose, the concentration of herbicides in the later stage is too large, and it is easy to form phytotoxicity.

The correct preparation method is the second dilution method: first add a small amount of water to the mother liquor, then pour into a sprayer containing a certain amount of water, then add the amount of water to be added, and stir while mixing, and mix thoroughly to the required concentration. Do not pour the medicine into the potion first, so that the medicine is easily deposited in the suction pipe of the sprayer, so that the concentration of the first sprayed liquid is high, and it is easy to cause phytotoxicity. The concentration of the liquid sprayed later is low, and the herbicidal effect is poor. Also, do not pour the medicine into a sprayer containing a large amount of water, so that the wettable powder tends to float on the water meter or form a small piece, and the distribution is uneven, which not only does not guarantee the effect but also easily blocks the spray hole when sprayed. In addition, the liquid should be prepared with clean water.

5. Avoid overdose.

Some farmers' friends will spray a few times in the thick and heavy places when they are fighting herbicides, or they will be afraid to waste the last remaining herbicides on the last plot, which will easily lead to herbicide damage. Because herbicides are safe for wheat at normal concentrations, if they are too much, the wheat itself cannot break down and suffer damage.

6. Correctly treat the phenomenon of yellowing seedlings of herbicides.

After some herbicides are applied, the wheat will have a short yellowing of the tip of the leaves. This is a normal seedling phenomenon, which is generally self-recovering when the wheat is green. This phenomenon will not cause the yield reduction, but will promote the wheat yield. It can prevent wheat from affecting its reproductive growth due to excessive nutrient growth, so don't worry too much.

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