How to choose herbicides in low temperature wheat fields

Answer: The herbicide should be used on the production as much as possible at a daily average temperature of 10°C or more and a minimum temperature of 5°C or more to prevent herbicides from being applied during periods when the temperature is too low. Generally, in Jiangsu and other places, January is the coldest month of the year. During this period, weeds and wheat both enter the overwintering period and their growth is extremely slow. Herbicide removal is not recommended. Herbicides are applied at low temperatures and their herbicidal effects are often affected and are more prone to phytotoxicity.

Relatively speaking, grassy weeds such as Aegilops latellae have lower tolerance to low temperature than wheat and can still grow slowly in the low temperature period. Before winter, weeds were not used to remove herbicides or use drugs that were not effective. Field grasses weeds in the field until the end of February and the beginning of March in spring are usually older and have a greater effect on the removal of grass. In early spring, we should use some herbicides that can be used early in the cold period for grass fields with weed grass ages of about 4 leaves.

In our province's large-scale production, the commonly used herbicides for control of grassy weeds in stems and leaves of small wheat fields include isoproturon, oxazolyoxime, clodinafop and combinations thereof with oxazoline oxalate. Sulfachlor, methylsulfuron, and the like. Among them, Isoproturon will reduce the antifreeze ability of wheat seedlings. In case of serious frost weather (lowest temperature below 2°C) after 1 week after spraying, the wheat seedlings will be easily frozen and “frozen phytotoxicity” will occur. Generally, this drug should not be used during the cold season. . When young wheat seedlings are damaged by water stains and freezes, they are treated with oxazolyl trimethoprim and methylsulfuron-methyl. The tolerance of herbicides such as the imidazolium is reduced, and the growth of wheat seedlings is likely to be severely inhibited after application. Severe seedlings can be killed, and these herbicides should be avoided in the cold season. It is safer to apply clodinafop-propargyl ester and its mixture with oxazoline oxalate in the low-temperature period, but it should also be avoided when the temperature is too low, otherwise it will not only affect the weed control effect, but also may cause phytotoxicity. Last year in some parts of our province, there was a relatively large area of ​​wheat seedlings that encountered low temperature after application of the homemade clodinafop-propargyl ester preparation in the early spring, and the phenomenon of yellow leaves appeared.

The commonly used herbicides for controlling broadleaf weeds in stems and leaves of small wheat fields include tribenuron-methyl, bensulfuron-methyl, fluoxypyranoacetate, merrazopsone, flufenoxaone, and 2-methyl-4-chlorophenol. These herbicides have relatively good safety to wheat seedlings, but in addition to other drugs such as flucontrione, other pesticides used in the low temperature period to kill grass slow, the weeding effect will be affected to varying degrees, 2 A 4 chlorine and other herbicides in the low temperature Use is also prone to phytotoxicity.

Tip: In our province, weeds in wheat fields normally have two peaks of weeding. The first peak of weeding occurs after wheat is sown and before winter, and the grass weeds in the field mainly emerge in this period. Broad-leaved weeds emerged; the second peak appeared after the temperature rose in the spring, mainly broad-leaved weeds, and some grass weeds. For these fields, production advocates the use of drugs to control grass weeds and eliminate grass weeds before winter (before mid-December). Relatively speaking, there are more pesticides for controlling broad-leaved weeds in wheat fields, weeding is relatively simple, and the requirements for grass age are not strict. In addition, broad-leaved weeds still have a grassy peak in spring, so production should not be at a low temperature. The use of stem and leaf treatment agent to prevent broad-leaved weeds, the best in the spring field broadleaf weeds after the basic out of the drug, the big grass and grass removed.

Late weeding occurred in wheat field in the late, the amount of weeds increased after the temperature rose in the spring, the amount of grass weeds and broad-leaved weeds was large, and weeds and broad-leaved weeds occurred. Due to the small age of the grass, it is usually controlled once in spring to control the weed.

Due to the long-term use of a small number of herbicides such as fenoxaforoxin, isoproturon, tribenuron, etc., in recent years, wheat fields, grasses, hardgrass, bluegrass, Japanese avocados, piglets, etc. The number of grass populations increased, and weeding effects of herbicides such as oxazolyoxime, isoproturon, and tribenuron-methyl were reduced, especially when these weeds were older and more resistant to herbicides, and the herbicidal effect was even worse. More fields occur in these weeds and should be used when the grass is young. In the early spring, for the wheat field with a grass age of about 4 leaf stage, the cold tail warmer should be used for the early administration of clodinafop propargyl and its compounding agent with oxazoline oxalate.

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