Use of herbicides in corn field management

After sowing soil treatment herbicide B 40% aqueous suspension (A Mixture B) the agent-specific effects of field corn herbicide for the corn field annual grass weeds such as crabgrass, green foxtail, barnyard grass, Eleusine indica, Thousands of gold, teff, bluegrass, etc. and annual broadleaf weeds such as medlar, medlar, medlar, nightshade, arbor, sputum, purslane, iron leeks, sorghum, sorghum, scoparia, fly, Small white wine grass, duck grass, etc. have excellent control effect, and also have obvious inhibition on sedge weeds.
The drug not only has a wide herbicidal spectrum, but also has high herbicidal activity and long service life. It is safe for corn and glutinous crops, etc., before the sowing of corn, before the emergence of the three-leaf stage of the weeds after corn emergence, every minute is used. 40% ethyl hydrazine suspension emulsion, 2250 ~ 3000 grams of summer maize in North China, 2250 ~ 3750 grams of spring corn in North China, 4500 ~ 6000 grams of spring maize in northeast, about 750 liters of water, even spray, field duration of 50 to 60 days, once The use of medicine can ensure that the whole growth period of the corn is not affected by weeds.
The herbicidal effect of acetamidine water is closely related to soil moisture. When the humidity is high, the drug effect is good, and when the soil is dry, the drug effect is low. Usually, it is necessary to pour 1 time of water or rainfall before applying the medicine. It is necessary to strictly control the medicine. It is best to apply the medicine before the weeds are excavated to ensure the full effect of the medicine. If it is used after excavation, it is better to use the weeds. Before the leaf stage, after the four-leaf stage of weeds, if the grass age is too large and then the drug is used, the drug efficacy will be lowered due to the improvement of the resistance of the weeds, and the amount of the drug should be reduced when using the agent in the sandy soil with low organic matter content.
E-barrel mix: This drug is a blend of acetochlor and saponin. It can be used in corn fields and corn and soybean fields to effectively control annual grasses and annual and partial perennial Leaf weeds, field-sustaining period of 30 to 60 days is safe for crops such as corn, soybeans and glutinous wheat. Apply before or after planting. In the spring corn field in the northeastern region, each branch is treated with 50% acetochlor 3000 ml plus 75% Bao 26.7 g; in summer corn (or soy) field, 50% acetochlor 1500 ml per step and 75% treasure Receive 19.95 grams; spray 450 to 7505 or evenly. When dispensing, first collect the treasure in a small cup with a small amount of warm water to make a mother liquid, pour into a mixed medicine bucket that has half of the water volume, then add acetochlor, then add the other half of the water and mix well, with a fan-shaped nozzle The application effect is the best.
50% Hebao Emulsifiable Oil: This medicine is a new type of herbicide with high efficiency, broad spectrum and safety. It can effectively prevent a variety of annual grass weeds and broadleaf weeds, against crabgrass, valerian, goosegrass, foxtail, big teff, thousand gold, chloris, sorrel, scorpion, scorpion, gray scorpion, The anti-branched locust, the hedgehog, the scorpion scorpion, the purslane, the iron leeks, the calves and the nightshade are most effective, and also have obvious inhibitory effects on some perennial weeds and sedge weeds.
50% Hebao emulsifiable concentrate can be used for soil sealing treatment before sowing, or can be treated as stem after 3 days of weeding of corn. Each minute is used with 50% Hebao EC 1.2-1.5 liters, and water is added 750 liters evenly. Spray can effectively control a variety of weeds. The relationship between soil moisture and drug efficacy is close, and the humidity is suitable for high efficacy when the condition is good. The drug is sensitive to weed shoots and has the best application effect before or after the sowing.
50% of the mixture is used in the corn seedlings before sowing, using 50% of the mixture of 2 to 35 kg per hectare, adding 750 liters of water, evenly spraying on the soil surface, against the crabgrass, the tendon grass, the foxtail, the teff, The annual grasses and annual broadleaf weeds such as cockroaches, scorpion scorpions, scorpion scorpions, scorpion scorpions, scorpion scorpions, Xanthium, purslane, Solanum nigrum, and cotton have good control effects.
Atrazine (Atrazine) is a selective pre-emergence bud herbicide for striated benzene. It can be used to control crabgrass, foxtail, teff, goosegrass, leeks, cockroaches, cocklebur, and fangs. Annual and dicotyledonous weeds such as alfalfa, Solanum nigrum L., Dioscorea opposita L., and Phyllostachys pubescens, and Phyllostachys pubescens have a de facto inhibitory effect on certain deep-rooted weeds.
Before the seeding of the corn, 38% of the atrazine suspension was used for 2.25 to 2.7 kg per minute. In the corn seedling stage, before the weed 3 leaf stage, 38% of atrazine was used for each minute, and the water was added 750. Rise evenly spray.
Atrazine has good efficacy and is very selective for corn. It is safe, but the field residual period is as long as 120-160 days. If it is used improperly, it will cause phytotoxicity in the crops. It is necessary to strictly control the dosage, and do not increase the dosage arbitrarily, and pay attention to uniform application to avoid heavy spray and leakage. Atrazine can be mixed with acetochlor, dol, lasso and chlorpyrifos, which not only expands the herbicidal spectrum, but also reduces soil residues, and recommends wheat safety.
Acetochlor: an amide-based selective pre-emergence herbicide, which has special effects on annual grass weeds such as goosegrass, crabgrass, valerian, foxtail, teff, millennium, bluegrass, and wild pheasant. Broad-leaved weeds such as alfalfa, alfalfa and purslane also have good control effects. After acetochlor is absorbed, corn can be quickly degraded into non-toxic substances. Therefore, for corn safety, in the northeast region after corn sowing, 50% acetochlor EC 2.25 ~ 3.75 kg, North China and South, 50% acetochlor EC 1.2-2.5 kg per hectare, 750 liters of water evenly sprayed the surface, the amount of film cover field reduced by about 1/3.
Fertile soils and areas with high organic matter content should be dosed up; areas with low soil and low organic matter should be appropriately reduced. The high humidity of the soil is conducive to the absorption of herbicides by weed seeds, and the effect of the drug is good. The soil drought affects the effect of the drug. Therefore, it is better to pour the land or have rainfall before the application, so that the soil has good moisture.
Duer (metolachlor): For selective pre-emergence soil treatment of herbicides, the effect of controlling grassy weeds is better than that of broadleaf weeds. Before the emergence of corn, the seedlings were used with 1.2% and 1.8 kilograms of 72% durum emulsifiable concentrate per hectare and 750 water.