On February 4th, the Spring Festival was entered into the Spring Festival. After the Spring Festival, the temperature rose, and the spring plough season began in most parts of the country. The wheat in many places will also enter the rejuvenation period (from late February to early March). If you miss the weeding before winter, you must catch the best period of weeds in this wheat field.
During the regreening period (from late February to early March), weeds are controlled between wheat fields. Because weeds are large and resistant to drugs, it is necessary to increase the dosage to be effective, and it is easy to cause phytotoxicity. note.
Use suitable herbicides and formulas
The herbicide selection for chemical weeding in wheat fields should be determined according to the main weed species and the herbicidal spectrum of herbicides. When a mixture of dicotyledonous weeds and monocotyledonous weeds occurs, several herbicides should be 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. 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 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.
3. 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.
4. 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.
5. 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. Source: Sannong Big Horn
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