In the earlier period, due to rain, wheat has not yet been planted. It is hoped that the diligent farmers will seize the good weather of the past few days and speed up land preparation, cultivating land, and planting land.
After wheat sowing, the farmers considered the most weeding problems, such as what herbicide to choose, which herbicide is good, when to use herbicides and so on.
Today, we will not talk about these issues. We will mainly talk about the technical problems of herbicide use in wheat fields. Among them, the "eight don't, two musts" are used during the use of wheat herbicides.
One Don't: Do not use herbicides before and after 4 leaves of wheat
Before the 4th leaf stage, wheat was delicate, its detoxification capacity and immunity were low, and it was easy to produce phytotoxicity.
After the jointing period, wheat enters the booting stage and is very fragile. At this time, the use of herbicides can easily produce phytotoxicity, especially 2A and 4Chlorine, which sometimes causes the wheat ear to fail to be extracted or deformed, which will seriously affect the final yield.
Do not: Do not use wheat herbicides at temperatures below 6 degrees
Herbicides are not ideal for use in cold climates. It is best to use medication at a daily average temperature above 6 degrees, and weeding is effective from 10 am to 3 pm.
Due to the strong growth of weeds that absorb light, open pores, and easy absorption of water and chemicals (the opposite is true at low temperatures), good weed control can be achieved.
Three Don't: Soil Drought Do Not Use Wheat Herbicides
When the soil is relatively dry, it is necessary to grasp the timing of watering the wheat field and apply pesticides in time to ensure the efficacy of herbicides.
Most herbicides require a certain amount of soil moisture to exert their effects. The soil moisture content of 40%-60% is most conducive to herbicide efficacy.
Four Do not: Do not use wheat herbicides in inclement weather
The use of herbicides before and after heavy rain and before the arrival of cold air can affect herbicidal effects on the one hand, and can easily cause phytotoxicity on the other. These are all bad weather, especially since herbicides cannot be used for 7 days before the end of the cold spell. Winter medicine should be given more attention. Weather forecast.
Five Do not: Do not re-spray or spray wheat herbicides
The use of herbicides must be evenly sprayed. If the spray is missing or where the weeds are infrequently sprayed, the control effect will certainly not be good. Remember not to re-spray and the wheat is susceptible to yellowing, which can easily cause herbicide harm.
Six Do not: Do not mix wheat herbicides with other herbicides, pesticides, and foliar fertilizers in order to avoid the occurrence of adverse reactions.
Seven Do not: Organophosphorus and carbamate pesticides Do not use wheat herbicides 7 days before and after use. Wheat field wheaticides used in these fields need to be separated by at least 3-5 days before herbicides are used. Otherwise, wheat yellowing can easily occur. There is a phenomenon of burning leaf, because organophosphorus pesticides reduce the ability of wheat to degrade herbicides, and the subsequent use of herbicides can easily lead to phytotoxicity.
Eight Do not: Do not increase the herbicide dose arbitrarily
According to the description of wheat herbicides, the purpose of reducing the amount of herbicides is not enough for the purpose of herbicides, and increasing the amount of pesticides is very likely to cause phytotoxicity.
One must: The use of secondary dilution is necessary for the use of wheat herbicides.
The use of herbicides must pay attention to the second dilution, some farmers friends figure directly save the herbicide directly into the sprayer, just find a branch and stir on the line. This kind of medicine is very unscientific.
Before the application, the agent is diluted with a small amount of fresh water into the mother liquor. When the medicine is used, the prepared mother liquor is first added in the medicine bucket, and then the remaining amount of water required for the supplement is sprayed after mixing.
Market feedback, now many dealers have realized the importance of the second dilution method, when selling drugs can prompt farmers to remind friends to use this method of medication.
Two must: Before the application of pesticides to be timely maintenance of medical equipment, in order to prevent the application of the process of running, running, drip, leakage phenomenon, to achieve uniform application. The medicines after the application should be promptly and thoroughly cleaned so as not to cause phytotoxicity to other crops.
Wheat herbicides, for the late sowing of the wheat, should be closed after sowing, in order to improve the weeding effect, reduce the occurrence of "frozen phytotoxicity", and reduce the cost of medication.
In view of this, it is too late to plant wheat in 2017, and it is possible that only weeding is closed! This need to pay attention to the following:
Wheat weeding has two methods of enclosing weeding and post-emergence spraying and weeding.
Closed weeding is the control of spray weeds no longer unearthed before the weeds are uncovered.
And weeding after weeding is the weeding out of the weeds. The herbicide is sprayed on the weeds to kill the grass.
We all know that weeding after wheat seedlings, prevention and treatment before winter, the main prevention and control of grass weeds, about in early November, the growth of 4-5 leaves of wheat, weeds generally grow 2 leaves 1 heart, this time the best control effect .
The late sowing of winter wheat this year may last till early November, and the time for emergence of wheat is elongated. If the medicine is used after emergence, the chance of a significant decrease in temperature will be very large. The temperature range suitable for the weeding of stems and leaves is narrow. It is easy to miss the best drug use period, such as the use of isoproterenol and other drugs, the occurrence of "frozen phytotoxicity" more likely.
Therefore, for late-seeding wheat in 2017, it is more important to eliminate soil before seedling. Closed soil treatment of wheat fields, many growers are used to medication immediately after sowing.
Many years of production practice have shown that the appropriate time for drug use is delayed, and the use of drugs before the needles in wheat is the best for closed weed control.
It is recommended to use the medicine immediately after germination when wheat is sown.
Because the soil has been submerged at this time, it is not conducive to the formation of a stable layer of medicinal soil. The grasses and weeds have emerged buds and roots, which are beneficial to the absorption of drugs in the soil and improve the weeding effect, and play a role in sealing and killing. Except for a portion of broad-leaved weeds that emerged before winter.
Closed herbicides require the emergence of weeds after wheat sowing, and if the soil moisture is suitable, it is necessary to pay attention to spraying. If soil moisture is not good enough, weeds have been unearthed and there will be heavy rainfall in 2-3 days after spraying. Closure of herbicides is not recommended.
Low Cost Fiber,Soluble Fiber,Sugar Free Fiber
Qingdao Bailong Huichuang Bio-tech Co., Ltd. , https://www.sdblcycn.com