1

Trade name Bentagran

Generic name Bentazon

Processing dosage form 48% Bentagran aqueous

Dosage rate 48% Bentagran 2.5~3.0 liters per hectare.

The use period of corn seedling broadleaf weeds 2 ~ 4 leaf stage.

The control object is a variety of broadleaf weeds.

Use 1.5 liters of 48% Diquat and 1.0 liters of 4% Yunongle per hectare.

It is safe for crop rotation.

2 Trade name Shuangle

Common name Propisochlor + 2,4-D butyl ester

Processing agent 50% emulsifiable concentrate

Use period of maize after sowing and before seedling application.

Control objects annual weeds and perennial broadleaf weeds.

Crop rotation is safe for later crops.

The application of chlormequat chloride or simazine in maize fields,

and the treatment of 2,4-dichloro or dimethyl tetrachloro in cereal fields are all utilizing the selectivity of herbicides between crops and weeds, which can safely and effectively prevent and eliminate weeds.

(Herbicides can be divided into selective herbicides and biocidal herbicides according to their mode of action.

Herbicides in different crops have selective, that is, able to poison or kill some plants, while some other plants are safer, this type of herbicide is called selective herbicide)

Introduction of some corn field commonly used herbicides.

1. Atrazine, also known as atrazine, formulated as a 40% gel suspension, is a broad-spectrum herbicide commonly used in corn fields. It is used before the emergence of corn after sowing, i.e., spraying atrazine immediately after sowing corn, with a dosage of 200 to 300 milliliters per acre. It should be noted that atrazine in the soil holding period is long, the application of too large a dose is easy to hurt the sensitive crops (such as oilseed rape, etc.), so the general use of stem and leaf spraying method of weed elimination, the time in the maize 3 ~ 5 leaf stage, weeds 2 ~ 3 leaf stage.

2. Ethopropamide Ethopropamide (50% emulsifiable concentrate) is a herbicide with the largest production volume in China. It is used before the emergence of corn after sowing, with a dosage of 150 to 200 ml per mu. The herbicide is safe for soybeans and peanuts, so it is suitable for plots where corn is intercropped with soybeans and peanuts. Ethofumesate mainly controls annual grass weeds, and is less effective against dicotyledonous weeds.

3. Butachlor dosage form is 50%, 60% emulsifiable concentrate, used after corn sowing before seedling, the dosage per acre is: 60% butachlor 125-150 ml or 50% butachlor 150-185 ml. Butachlor is safe for soybeans and peanuts, so it is suitable for plots where corn is intercropped with soybeans and peanuts.

4. Ethyl Herb Water Ethyl Herb Water is a mixture of Atrazine and Ethalfluralin, which is used after corn sowing and before seedling emergence, with a dosage of 200-300 milliliters per acre. It should be noted that ethalfluralin cannot be used in plots where corn is intercropped with soybeans and peanuts, and is only applicable to plots where corn is monocropped.

5. Kegelin Kegelin 45% suspension emulsion is a weed killer mix developed by the Weed Research Office of the Department of Agronomy of Shandong Laiyang Agricultural College, which is a new, safe and efficient herbicide for preventing and eliminating mixed weed communities in corn fields. After 3 years of field tests, it has been proved that Ketofen can be used once to prevent and eliminate all kinds of weeds in summer corn fields, with the effect of weed control reaching more than 90%, and the period of efficacy lasting for 60 days. The best use period is before corn seeding or 10 to 15 days after corn seeding, mu dosage 200 to 250 ml. Pharmaceuticals should be fully shaken before use, pharmaceuticals added to the sprayer to the water should also be stirred evenly, the amount of water per mu 30 ~ 35 kg. To choose windless weather to use, in order to prevent the liquid drift to sensitive crops such as soybeans, peanuts, cotton caused by drug damage.

6. Lasso its generic name is alachlor (43% emulsifiable concentrate), also known as grass is not green. Lasso is a selective pre-emergence herbicide, can be absorbed by young plant buds, so that the young bud stage of the weed is killed without emergence. It is used before the emergence of corn after sowing, with a dosage of 150-300 ml per mu, 30-35 kg to water, and sprayed evenly. Lasso is safe for soybeans, so it is suitable for chemical weed control in intercropping plots of corn and soybeans.