Over the past few years, with the widespread use of chemical weeding in summer sowing maize, farmers have raised a common problem—chemical weeding is poor. In order to solve this practical problem, the author has conducted a large number of investigations and studies in recent years. The survey results are summarized below for readers' reference.
First, the main factors affecting the herbicide effect
1, improper herbicide selection. Since most farmers do not know enough about the chemical composition of weedicides and the type of weeds, they cannot use drugs for grass species.
2. Remaining glutinous rice, straw, wheat stubble and big grass in the wheat field. Now the harvest of wheat fields is harvested by a large harvester. The height of wheat stubble is 25-30 cm. Wheat straw and wheat stubble are scattered in the fields. Farmers do not exterminate, concentrate, or pull out, and they use mechanical spraying to spray medicine. It falls to the surface of the soil and weeds, and it does not serve to seal the ground and kill weeds. Large crops of grass remain in the wheat field, and the existing corn herbicide has little effect on it.
3, environmental factors. The sowing date of summer corn is mostly in mid-June. At this time, it is characterized by high temperature, drought, and little rain, and an abnormal period of climate change. The herbicide sprayed volatile and rapid liquid, difficult to form a closed film on the surface of the soil; high temperature and drought also hindered the efficacy of transmission and conduction in the weeds; sometimes after spraying suddenly rain, so that efficacy with the loss of rain.
4, spray the evening, the amount of less. The currently used corn herbicides had the best effect of controlling spraying before the weed 5 leaf stage. However, some farmers did not spray pesticides in time, the weeds grew, and the drug resistance increased. They missed the best period of prevention and control. In order to save labor and labor, some farmers add a small amount of water when configuring the liquid, generally only about 15 kilograms per mu, and the sprayed ground cannot form a film, which does not meet the expected control effect.
5. Failed to use medication correctly. (1) The suspension herbicide is used without fully shaking. (2) Instead of using the inverted spray method and adopting the advance method, the ground that has just been closed by the liquid is trampled by one's own foot, and the foot area continues to grow grass. (3) The spraying is not uniform, there is a phenomenon of missing spray and heavy spraying. (4) The spraying time is wrong, before and after noon spraying, the liquid evaporation quickly, so that the efficacy decreased. (5) Spraying on windy days, some pesticides are falling outside the corn field and the effective dose is reduced, which will affect the weeding effect.
Second, how to improve the herbicide effect 1, when buying corn herbicide, the first herbicide herbicide suppression and instructions. For lands dominated by green foxtail, goosegrass, alfalfa, loquat, and crabgrass, 41% of Yucaojing SU (suspending agent) can be used for 180-200 ml/mu, or 40% atrazine SC 160 ml/mu. Or use 40% acetamidine water SC (suspension) 160-200 ml/mu, before corn seeding after emergence, can not be later than the weed 2 leaf stage; when weeds are in the 2-5 leaf stage, should choose 4% Yu Nong Le SC 70 ml / mu, or 2.25% Ketsit EC (emulsion) 120 ml / mu, control of weeds; large blocks of weeds, corn sprayed immediately after sowing 20% ​​paraquat AS (water agent) ) 80-120 ml/mu, after spraying corn field herbicide.
2. For mechanical harvesting of wheat plots of wheat, the wheat straw and wheat stubble in the field should be cleared out of the field first, and the dosage should be increased appropriately. The maximum dose can be used for the corn field with high wheat stubble.
3. When herbicides are used, they should be sprayed in accordance with the principle of first spraying the soil and the surface of the soil is wet. In dry years, spray immediately after watering. After spraying, it is raining and the efficacy is lost. It should be sprayed again. When the spray is applied, the surface of the surface is wet, which is beneficial to the formation of the membranous layer to achieve the function of closing the ground, and has the effect of weeding.
4, strictly control the dosage, increase the amount of liquid. At present, there are many kinds of herbicides in corn, and the active ingredient content is quite different. Use the product strictly according to the dosage instructions for the drug. It is forbidden to use drugs that are too large or too small, and it is necessary to ensure the weed control effect without affecting the growth of corn and mandible crops. General requirements Mu 35-45 kg of liquid, or require a large amount of 45-55 kg per mu, to ensure that the surface of the soil after spraying the effect of moist.
5, timely and correct application of herbicides. (1) According to the herbicide instructions, determine the spraying period. (2) Use it after fully shaking the mother liquor. (3) Spraying is used for spraying. (4) Master the windless weather before 9am or after 5pm. Do not re-spray, no leakage of spray, spray the right amount of uniform.
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