In recent years, the application of herbicides in corn fields has not been ideal, and has been criticized by some farmers. In this regard, the author conducted a survey and talked about the following views.
First, the cause of herbicides
Due to fierce competition in the market, many herbicide manufacturers have adopted the means of “reducing the price and advertising bombingâ€, and the cost has been greatly improved. In order to ensure a certain profit, some manufacturers have adopted measures to reduce capacity and reduce content to reduce costs. For example, the previous herbicide was 500 grams per bottle, and the effect of one bottle of medicine on 3 acres was very good; now most of them are 300 grams of one bottle, plus the effective content is reduced, that is, 1 bottle of 2 acres of land, the effective dose is also Obviously insufficient.
Second, the climate reasons
There are three main problems: First, high temperature and drought during medication. There is very little rainfall after corn sowing, and drought and high temperature directly affect the use effect. Even if the water is poured over the plot, the liquid will evaporate quickly and affect the effect (most typical in 1998). Second, excessive rainfall during treatment. After application of the herbicide, dump heavy rain or continuous rainfall, it will destroy the chemical blocking layer, so that the loss of liquid, resulting in young roots and shoots of weeds not absorbed can be lethal dose, poor herbicidal effect. Three is too late rains. Weed seeds distributed at different depths in the soil, germination time are not the same; the same time, closed soil herbicide is valid for 45 to 60 days, too late rains, naturally there will be "no pre-grass, grass late Montreal situation "(the most typical 2003).
Third, inappropriate medication
First, there are too many coverings in the field and the amount of water used is too small. The wheat harvested by the wheat machinery is high, the wheat straw in the field and the wheat stubble are too much, and the herbicide is intercepted. The contact area between the liquid and the surface is greatly reduced; many farmers use 1~2 sprayer per acre, plus the uneven spraying, directly affecting Herbicidal effect. Second, the medication time is late. Some plots are already "small grass full of land" or "grass full of grass" (mainly crabgrass, wild grain seedlings, etc.). The soil-enclosed herbicide is ineffective against monocotyledonous weeds above 3 leaves.
Fourth, the response measures
In view of the above problems, the author's practical experience is: do not believe in advertising, select manufacturers with high visibility, good reputation, high content of active herbicides, such as 48% Zhongdian Cao (CLP Group), 50% new jade ( Xuanhua), 48% Ding, 42% Cyanizine B, etc. For the plots with more field coverings, the author sums up the method of “double addition and one mixingâ€, and the effect is remarkable. “Double increase†means increasing the water consumption (2~3 sprayers per mu) and increasing the dosage by 30%~50% (to offset the interception of the herbicide and its volatile loss in the field covering). “One mix†is to improve the control effect, and avoid excessive herbicides may cause phytotoxicity to corn or sorghum wheat. It is mixed with two different brands of herbicides, such as 48% Zhongdian Cao (Ea)+
40% isopropyl oxacillin, 50% new jade 乙 (Ea) + 42% cyanamide · B or 48% Ding, etc. (Note: The main ingredients of the two brands of herbicides are not the same, the amount of use is recommended The dosage is 65%~75%. This method is much safer than the use of a herbicide alone to increase the dosage by 30%~50%. In addition, for the plots with large grasses in the field, before spraying (before seeding of corn), the grass is eliminated by the systemic herbicide 10% glyphosate 600~800 g.
First, the cause of herbicides
Due to fierce competition in the market, many herbicide manufacturers have adopted the means of “reducing the price and advertising bombingâ€, and the cost has been greatly improved. In order to ensure a certain profit, some manufacturers have adopted measures to reduce capacity and reduce content to reduce costs. For example, the previous herbicide was 500 grams per bottle, and the effect of one bottle of medicine on 3 acres was very good; now most of them are 300 grams of one bottle, plus the effective content is reduced, that is, 1 bottle of 2 acres of land, the effective dose is also Obviously insufficient.
Second, the climate reasons
There are three main problems: First, high temperature and drought during medication. There is very little rainfall after corn sowing, and drought and high temperature directly affect the use effect. Even if the water is poured over the plot, the liquid will evaporate quickly and affect the effect (most typical in 1998). Second, excessive rainfall during treatment. After application of the herbicide, dump heavy rain or continuous rainfall, it will destroy the chemical blocking layer, so that the loss of liquid, resulting in young roots and shoots of weeds not absorbed can be lethal dose, poor herbicidal effect. Three is too late rains. Weed seeds distributed at different depths in the soil, germination time are not the same; the same time, closed soil herbicide is valid for 45 to 60 days, too late rains, naturally there will be "no pre-grass, grass late Montreal situation "(the most typical 2003).
Third, inappropriate medication
First, there are too many coverings in the field and the amount of water used is too small. The wheat harvested by the wheat machinery is high, the wheat straw in the field and the wheat stubble are too much, and the herbicide is intercepted. The contact area between the liquid and the surface is greatly reduced; many farmers use 1~2 sprayer per acre, plus the uneven spraying, directly affecting Herbicidal effect. Second, the medication time is late. Some plots are already "small grass full of land" or "grass full of grass" (mainly crabgrass, wild grain seedlings, etc.). The soil-enclosed herbicide is ineffective against monocotyledonous weeds above 3 leaves.
Fourth, the response measures
In view of the above problems, the author's practical experience is: do not believe in advertising, select manufacturers with high visibility, good reputation, high content of active herbicides, such as 48% Zhongdian Cao (CLP Group), 50% new jade ( Xuanhua), 48% Ding, 42% Cyanizine B, etc. For the plots with more field coverings, the author sums up the method of “double addition and one mixingâ€, and the effect is remarkable. “Double increase†means increasing the water consumption (2~3 sprayers per mu) and increasing the dosage by 30%~50% (to offset the interception of the herbicide and its volatile loss in the field covering). “One mix†is to improve the control effect, and avoid excessive herbicides may cause phytotoxicity to corn or sorghum wheat. It is mixed with two different brands of herbicides, such as 48% Zhongdian Cao (Ea)+
40% isopropyl oxacillin, 50% new jade 乙 (Ea) + 42% cyanamide · B or 48% Ding, etc. (Note: The main ingredients of the two brands of herbicides are not the same, the amount of use is recommended The dosage is 65%~75%. This method is much safer than the use of a herbicide alone to increase the dosage by 30%~50%. In addition, for the plots with large grasses in the field, before spraying (before seeding of corn), the grass is eliminated by the systemic herbicide 10% glyphosate 600~800 g.
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