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.
I. Herbicide Causes 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 capacity reduction and content reduction. Means 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, there are three main problems in climate: 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). The second is excessive rainfall during the medication. After applying the herbicide, sudden rain or continuous rainfall will destroy the liquid sealing layer, causing the loss of the liquid, causing the weeds and roots of the weeds to not absorb the amount of the lethal agent, and the herbicidal effect is not good. The third is excessive rainfall in the middle and late period. Weed seeds are distributed in different depths in the soil, and the germination time is not the same. At the same time, the effective period of soil-blocking herbicides is 45-60 days. In the middle and late periods, there is too much rainfall, and naturally there will be “pre-stage grass, late grassâ€. The situation of “full land†(most typical in 2003).
Third, improper medication First, too much cover in the field, too little water. 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 countermeasures In response to 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), 50% New jade (Xuanhua), 48% Ding, 42% cyanazine, B and so on. 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% Isoprost, 50% new jade (Ea) + 42% cyanazine · B or 48% Ding, etc. (Note: the main ingredients of the two brands of herbicides are not the same, the amount of use is the recommended amount 65%~75%. This method is much better than the use of a herbicide 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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