What herbicide is used after corn seedling?
At present, the post-emergence herbicides on the market are very simple and common, including nicosulfuron, mesotrione and atrazine.
The common compounds are nicosulfuron+atrazine/mesotrione+atrazine/nicosulfuron+mesotrione+atrazine.
Of course, there are other ingredients, such as 2,4-dibutyl ester, chloroacetic acid, dicamba and so on. , but the above three kinds of compound drugs are common, specifically the situation of these three kinds of compound drugs.
Nicosulfuron+atrazine:
Generally speaking, the total content of 4% nicosulfuron and 20% or 30% atrazine is 24% or 34%.
Advantages: the price is low (about 5 yuan per mu), and common weeds in corn fields can be prevented and eliminated after years of use, such as crabgrass, amaranth, Commelina communis and barnyard grass.
The control of the old reed is average.
Disadvantages: the grass died slowly, and it died slowly after 20 days.
Mesotrione+atrazine:
Common is 55% mesotrione atrazine.
Advantages: the grass dies quickly, and the effect can be seen in 7 days. Most weeds in corn fields can be controlled, but old reeds are generally controlled.
Disadvantages: The price is more expensive than nicosulfuron, about per mu 10 yuan.
Weeds will rebound easily if they are not used properly.
Nicosulfuron+mesotrione+atrazine:
Ternary compounds, the common total content is generally 28%.
For example: 2.5% nicosulfuron +5.5% nitrosulfuron +20% nicosulfuron, 3% nicosulfuron +5% nitrosulfuron +20% nicosulfuron.
Advantages: Combining the advantages of nicosulfuron and nitrosulfuron, the weeding spectrum is wider, the weeding speed is fast, and it does not rebound.
Disadvantages: the price is relatively expensive, and the cost per mu is 15- 18 yuan.
However, in the past two years, the ternary combination of nicosulfuron+mesotrione+atrazine has become more and more popular among farmers, depending on their own cost budget.
Note: The above three herbicides are only applicable to common corn, but not to sweet corn, popcorn, Taneda and self-bred corn fields.
What are the herbicides after corn seedling?
The main components are nicosulfuron, mesotrione, oxadiazon and oxadiazon (domestic patented products), as well as these four kinds of mixed atrazine products and ternary compound products (all products are sold by manufacturers, but the main weeding effects are nicosulfuron, mesotrione, oxadiazon and oxadiazon).
Several products have their own advantages.
Product performance characteristics are the dominant factors.
Nicosulfuron has outstanding advantages: first, high activity and low dosage; Second, the internal absorption is strong, and the dead grass does not rebound at all; Thirdly, it has a good control effect on gramineous weeds, especially on catastrophic spontaneous wheat seedlings of summer corn after wheat stubble, and also on refractory cattle grass.
In addition, nicosulfuron also has the advantage of strong miscibility, can be compounded with many chemicals, and generally has no residual pesticide damage to subsequent crops.
Disadvantages: the speed of dead grass is slow; The application scope is limited, so sticky corn, sweet corn, popcorn and seed corn cannot be used, and a few field corn varieties should be used with caution; The application technology is strict.
Mesotrione has outstanding advantages: first, it is fast; Second, high security; Third, the weeding spectrum is wide, and it has control effect on common weeds in corn fields.
In addition, it also has the advantages of strong miscibility, mixing with many chemicals, short half-life and safety to subsequent crops.
Disadvantages: the effect on gramineous weeds is worse than that on broad-leaved weeds, especially for intractable cattail and green bristlegrass, sometimes the leaves die after taking the medicine and often turn green after rain; The cost per mu is higher than that of nicosulfuron; Can not be mixed with organophosphorus, mechanical spraying is the same as nicosulfuron.
The outstanding advantages of benazolin are as follows: firstly, it has high safety, can be used for all corn varieties in the field, such as sticky corn, sweet corn and popcorn, and has no sensitive restricted varieties, and can also be used for some inbred lines in seed production fields; Second, high activity and low dose; Third, the speed of dead grass is fast and the spectrum of killing grass is wide.
The above are all about what herbicides are used after corn seedling and what herbicides are available after corn seedling.
It should be noted that although corn seedlings are less affected by climate, they are easy to have key points, so herbicides must be used correctly.
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