Can you hit wheat herbicide twice Can you get wheat herbicide twice?

Generally, you can't hit it twice. The reasons are: 1. Wheat is a herbicide for most people.

The dosage is very sensitive, so it should be strictly controlled, and the dosage is likely to be overdosed twice. 2. The time for using herbicides in wheat is also regulated, and beyond this period, wheat will be harmed. Two doses are likely to exceed the reasonable dosing period.

3. Wheat herbicides have a certain residual effect period, and hitting twice will prolong the residual effect period, which will have an impact on the next crop. Of course, in some cases, it can be shot twice, such as when it rains just after the shot, or the concentration of the medicine is too low in the previous shot.

*Yes**, wheat herbicide can be applied twice, but it is not recommended.

After spraying wheat herbicide at the seedling stage, if there are still many weeds in the field at the green stage after the year, the herbicide can be sprayed a second time at the green stage. However, it should be noted that if the wheat has herbicide damage or frost damage before the year, it is not recommended to apply the herbicide a second time when there are more weeds in the field at the regreening stage, because the wheat itself is weak, and the reabsorption of the herbicide solution may cause the phenomenon of dead seedlings.

At the same time, if the herbicide was not sprayed before the year, but the weeds did not die due to weather factors, you can also decide whether to spray the herbicide a second time according to the actual situation.

Behind the Mpemba phenomenon, a cup of cold water and a cup of hot water are placed in the freezer compartment of the refrigerator at the same time, which glass of water freezes first? "Of course the cold water froze first! "I believe that many people will not hesitate to do this.

Unfortunately, this answer is wrong. The mistake was discovered by Mpemba, a junior high school student at Magamba Middle School in Tanzania, Africa. One day in 1963, Mpemba found that the hot milk he kept in the freezer of his refrigerator froze before the cold milk of his classmates.

This puzzled him, so he immediately ran to the teacher and asked for advice. The teacher said easily, "You must be mistaken, Mpamba."

Unconvinced, Mpemba tried again, but the hot milk froze before the cold milk. One day, Dr. Osborn, Head of the Department of Physics at the University of Dar es Salaam, visited Mpemba's school. Mpemba mustered up the courage to ask the doctor his question.

Dr. Osborn said, "I can't ask you questions right away, but I promise to do this experiment myself as soon as I get back to Dar es Salaam." As a result, the doctor's experiment was exactly what Mpemba said.

As a result, this phenomenon is known as the "Mpemba phenomenon". For more than 40 years, the "Mpemba phenomenon" has been recognized as truth to this day. It doesn't end there.

In 2004, Yu Shunxi, a girl from Xiangming Middle School in Shanghai, questioned this phenomenon. Under the guidance of Huang Zengxin, a famous science and technology teacher, Yu Shunxi and two other female students began to study the Mpemba phenomenon. They use sugar, water, milk, starch, ice cream and other ingredients to collect.

Summary. According to the results of the inquiry, the general interval is about three to five days, corn fields have been sprayed with organophosphorus or carbamate pesticides need to be separated by 7 days before herbicides can be used, and wheat fields have been sprayed with such pesticides at least 3-5 days before herbicides can be used. Otherwise, it is easy to cause wheat to turn yellow and burn leaves, because organophosphorus pesticides reduce the ability of wheat to reduce herbicides, and the subsequent use of herbicides is easy to lead to pesticide damage.

As a result, it was. According to the results of the inquiry, the general interval is about three to five days, corn fields have been sprayed with organophosphorus or carbamate pesticides need to be separated by 7 days before herbicides can be used, and wheat fields have been sprayed with such pesticides at least 3-5 days before herbicides can be used. Otherwise, it is easy to cause wheat to turn yellow and burn leaves, because the organophosphorus pesticides reduce the ability of wheat or split rent to remove herbicides, and then the use of herbicides is easy to lead to pesticide damage. As a result, it was.

Herbicide can be applied twice in a wheat season, but this is not recommended.

What should be paid attention to when burying the first finger with the second time 1. Buy a herbicide with a safety agent, because the second herbicide has missed the use period, and if you are not careful, the wheat will be harmed. 2. When hitting the second time, do not spray in the whole field, you can spray the weeds in the middle of the wheat row spacing, bring a mask, press down the nozzle, and hit the liquid mainly on the weeds. Do not apply herbicides in windy weather.

3. Remind an important bending point, no matter whether the grass is dead or not, and how many weeds there are, after the wheat reaches the jointing stage, don't use the herbicide in the mountain.

As for the wheat herbicide was sprayed.

In recent days, the little helper has received a lot of messages from friends, which can be divided into two situations. I applied herbicide a year ago, and the effect was okay, but after a year, new weeds grew, do I need to fight again? After the year, I played herbicide, and after half a month, the grass still didn't die, looking at the weeds all over the ground, I asked if I could hit it a second time?

The two cases mentioned above are estimated to have been encountered by many friends, so I would like to express my views on this issue.

First of all, I personally suggest that the wheat herbicide cannot be played a second time (don't refute it if you don't agree, look down), the herbicide is played, the weeds are not dead, first analyze the reasons, nothing more than the following: herbicide fake; The period, temperature, humidity and method of spraying are incorrect; The dosage is out of control. Basically, it's these 3 points, some friends said again, I don't meet these 3 points, because the weeds died, but then they grew again, what should I do?

There are two situations: one is that there are not many new weeds, and they are much smaller than wheat seedlings, which will not affect the normal growth of wheat. In this case, there is no need to use herbicides, and it will not affect the yield of wheat, so no one knows how to ensure that there is no grass in the field, right?

The new weeds are numerous and vigorous, some even exceeding the height of wheat. At this time, if you want to apply herbicides again, it is not impossible, but you must buy whole field spraying, wear a mask when applying pesticides, the nozzle should be low, and the liquid medicine should mainly fight weeds. In addition to the newly grown weeds mentioned above, what if the herbicide grass does not die?

It also depends on the degree of poisoning of the grass, if it looks not dead, but the roots have rotted, it has little impact on the wheat, you can ignore it, if you hit it, the effect is not obvious, as mentioned above, you have to hit it a second time, wear a mask, press down the nozzle, and the liquid is mainly on the weeds. In conclusion, it is important to understand the specific causes of weed deaths.

In addition to the impact of rainfall on spraying, do not re-spray the same type of herbicide, and pay attention to the interval of about 7 days, add enough water, use enough medicine, catch the cold tail and warm the head, and avoid bad weather.

Unified spraying in the field, no fertilization and watering in the short term after treatment, will affect the prevention and control effect of field management measures, at the same time, choose reliable quality pesticides when spraying, do not increase the dosage at will, and ensure that the spraying control before wheat jointing has no impact on wheat.

I don't think it is necessary, there are some other methods to achieve the effect of weeding, if the pesticide is sprayed a second time at this time, it may lead to a change in the growth trend of the wheat, affect the survival rate of the wheat, and affect the harvest.

No, it means that the effect of the herbicide is not good, or the spraying time is incorrect, it is not recommended to hit the second time, otherwise it will cause wheat diseases.

Yes, this can effectively control weeds, allow plants to grow better, and avoid weeds from absorbing nutrients.

Generally, the weeds are basically out of the wheat about 1 month after sowing (accounting for more than 95% of the total grass), and the wheat is about 3 5 leaf stage at this time, which is the best period for weeding in wheat field.

After sowing, there is more rain, the field moisture is good, and the weeds emerge quickly, but the moisture is insufficient after sowing, and the weed seedlings will be affected. However, the latest spraying time should not exceed mid-December.

Herbicides are generally sprayed about 30 days after sowing wheat. That is, in early November, wheat grows to about 4 or 5 leaves, and weeds such as wild wheat and knotted wheat grow to about 2 leaves, and the effect of medicine is the best at this time!

Wait until the wheat is a palm's height before applying herbicides, if you shoot too early, it may affect the growth of the wheat.

Summary. Herbicides must be used in strict accordance with the regulations, to avoid excessive use, some farmers will spray a few times in the thick place of the grass when playing herbicides, or afraid of wasting the last remaining herbicides to hit the last plot, this practice is easy to lead to herbicide damage, because herbicides are safe for wheat at normal concentrations, but if excessive use, wheat itself can not be decomposed, it will cause harm to wheat.

Wheat herbicide 5 times at a time, is it a one-time pass, is it okay?

Herbicides must be used in strict accordance with the regulations, to avoid excessive use, some farmers will spray a few times in the thick of the grass when playing herbicides, or afraid of wasting the last remaining herbicides to hit the last plot, this practice is easy to lead to herbicide damage, because herbicides are safe for wheat at normal use concentrations, but if the use of excessive amounts of wheat, wheat itself can not be decomposed, it will cause spring chain damage to wheat.

Generally speaking, it cannot be sprayed repeatedly, otherwise it will cause pesticide damage. Wheat herbicides should not be sprayed repeatedly during the residual period.

Summary. Hello, the interval between wheat herbicides should be divided into situations, if the wheat herbicide was sprayed at the seedling stage before the year, when it came to the green period after the year, it was found that there were still a lot of weeds in the field. At this time, it is necessary to observe the growth of the wheat, if the wheat is growing normally, the root system is not damaged, and there are small weeds that have just grown in the field.

In this case, you can apply a second herbicide during the rejuvenation period, according to the normal dose, or increase the dose by 20%, do not increase the amount too much.

Hello, the interval between wheat herbicides should be divided into situations, if the wheat herbicide was sprayed at the seedling stage before the year, when it came to the green period after the year, it was found that there were still a lot of weeds in the field of filial piety. At this time, it is necessary to observe the growth of wheat, if the wheat grows normally, the root system is not damaged, and there are small weeds growing from orange pomace in the field. In this case, you can apply a second herbicide during the rejuvenation period, according to the normal dose, or increase the dose by 20%, do not increase the amount too much.

The stupid yellow dragon that fought for the first time, the effect was not good for about ten days, can you still fight the second class double Buddha.

At least 15 days have passed.

The residual effect period of benzensulfuron used in grass is about 60 days, and the activity of benzensulfuron is very high.

If you hit the second two Buddhas, will it have an effect on the wheat?

2. Methyldifluoride removes broad-leaved weeds such as shepherd's cabbage, chickweed, and pig, which is safe for wheat. The herbicide can be used before winter and early spring, the effect of application is good in the tillering period of wheat wild jujube, and the weeds are sprayed finely, and the effect can be sucked and dismantled after one hour, and the rain will not affect the efficacy.

Generally speaking, it doesn't matter.

Is it okay to play with a piece of sterilization nutrition.

The two Buddhas should pay attention to the measurement and not overdo it.

It is not recommended to play together.

Wait at least 2 weeks apart to avoid affecting the results.

Is it harmful to wheat when beaten together?

May affect the effectiveness of the drug.

How often does the wheat herbicide interval be applied twice, and the specific herbicide is different, and the safety interval time is generally listed on the instructions.

For example, besulfuron crops can be used at most once per season, and the safety interval in winter wheat fields is 30 days.

How to use wheat herbicides

Temperature. 1. Generally, when the average temperature is higher than 6, the control effect of herbicides is better, and benzuron-methyl and other agents are sensitive to temperature, and under low temperature conditions, 15 to 20 days after spraying, or even 1 month later, will have a better control effect. Herbicides need to be used on sunny days and when the temperature is slightly higher, generally at 10 am or 3 pm, if the land is dry, herbicides need to increase water consumption, will have a better control effect.

2, the wheat herbicide not only to grasp the temperature, but also to grasp the time, generally wheat herbicide suitable time is the wheat tillering period before winter, and the early stage of the second year of wheat jointing, these two periods of herbicide control effect is better, the wheat is also safe, if the time is late, the effect will be poor, Li Bi in which the "2,4 to d butyl ester" herbicide is played as early as possible, benzensulfuron is better to use before the wheat returns to green, can avoid pesticide damage to the next crop.

The use of wheat herbicides is generally carried out when the local average daily temperature is stable above 6, and the spraying effect is best when the temperature is about 10.

Combination recipes. 1. For the prevention and control of broad-leaved weeds such as humulus, camellia, Maijiagong, Artemisia annua, ionic grass, etc., 75% benzuron water-dispersible granules can be used, with a suitable dosage of 1g per mu, or 10% besulfuron wettable powder, with a suitable dosage of 10g per mu.

2. For the prevention of rock cavity and treatment of finch wheat grass, 70% fluzosulfuron water dispersible granules can be used, and the appropriate dosage per mu is 3 to 4g.

3. For the prevention and control of bowl flowers, 20% chlorofluoropyroxyacetic acid emulsifiable concentrate can be used, and the appropriate dosage per mu is 50 to 70ml.

4. For the prevention and control of Irene and Kanmai Niang, 15% alkyne ester coarse wettable powder can be used, with a suitable dosage of 30 to 40g per mu, or emulsifiable concentrate of 30 to 40ml per mu.

5. For the prevention and control of the mixed growth of finch wheat grass and broad-leaved weeds, 3 to 4g of 70% fluzosulfuron water dispersible granules and 10g of 10% benzensulfuron wettable powder can be used per mu.

6. The above formula needs to be mixed with 60 to 80 kg of water per mu, and it can be sprayed evenly with spraying trucks and hand pressure sprayers.