Improper use of herbicides is harmful. What are the hazards?

The harm of improper use of herbicides inhibits crop growth in this season: wheat, corn, soybean and cotton were tested at normal dosage. The results show that compared with manual weeding, basically all herbicides have the same side effect, that is, reducing production. When the crop is inhibited for 7- 15 days, the yield will be reduced by more than 10%. Under the conditions of weak seedlings, inverted seedlings or increased dosage, the yield decreased by 20-30%. The experiment in Heilongjiang Plant Protection Station showed that the side effects of herbicides reduced the yield of corn, soybean and rice by 20.6% ~ 37. 1%. The experiment of Henan Institute for Drug Control showed that the side effects of herbicides reduced the yield of wheat, soybean and corn by 13.8% ~ 29.7%. The test results of Shandong Plant Protection Station showed that the side effects of herbicides reduced the yield of corn by 16%.

Residues affect the development of subsequent crops: The basic principle of herbicides is to inhibit acetolactate synthase (ALS) in plants, thus affecting the synthesis of branched-chain amino acids. Herbicide is the most destructive to weeds when protecting crops. But weeds are related to plants. For example, in the same suitable growing season, wheat grown in rape field is a weed. After harvesting wheat, plant soybeans or corn. Regenerated wheat is also a weed. Due to the time gap, it has brought many difficulties to herbicides.

Because herbicides are targeted, weeds are relative to planting crops. When the so-called "weeds" become planted crops, the herbicides left in the soil will still not let it go. If the herbicide used on a crop is to kill this crop, then this crop will be plagued by demons, unable to grow normally, and even lead to serious crop failure.

Pollution to grain, soil and groundwater: The herbicide we use is mainly organophosphorus, and the residual period of organophosphorus in soil can reach more than 36 months. According to the survey, 20-70% of commonly used herbicides will remain in the soil for a long time, causing pollution to soil, groundwater and even grains. Contaminated crops will also affect human health after entering the human body through the food chain.

Cause land "cancer": the "cancer" of land is the image of "cancer field", which is impossible to change crops, and the crop yield is low or there is no harvest at all. In Heilongjiang, Inner Mongolia, Jilin and other northeastern regions, a large area of "cancer fields" has emerged due to the long-term excessive use of herbicides. Although there is no "cancer area" in the Central Plains, it is necessary to prevent the cumulative effect caused by long-term use of herbicides. Once a "cancer field" is formed, agricultural production will suffer huge losses.