What are the soil-applied pre-emergence herbicide methods for corn fields?
What are the main weeds in corn fields? What are the soil-applied pre-emergence herbicide methods for corn fields? We would also like experienced growers to help explain. The main weeds in corn fields include crabgrass, goosegrass, foxtail, redroot pigweed, goosefoot, copperleaf, and field bindweed, among other monocot and dicot weeds. Of these, crabgrass and goosegrass are the most common. Because corn...
What are the main weeds in corn fields? What are the soil-applied pre-emergence herbicide methods for corn fields? We would also like experienced growers to help explain.The main weeds in corn fields include crabgrass, goosegrass, foxtail, redroot pigweed, goosefoot, copperleaf, and field bindweed, among other monocot and dicot weeds. Of these, crabgrass and goosegrass are the most common.
Because weeds in corn fields grow rapidly and produce a large amount of growth, competing with corn for water, nutrients, and space, they cause serious harm to corn growth at the seedling stage, resulting in thin and weak seedlings and affecting yield by 10-30%. Therefore, Zhongdiwang has compiled soil-applied pre-emergence herbicide methods for corn fields, and the steps are listed below for growers' reference.
I. Correctly select a suitable herbicide variety:
A 40% suspension concentrate or 48% Chucaowei can be used; it is new, safe, highly effective, low in toxicity, and low in residue, with good weed control results.
II. Timing of application:
Generally, it is used after corn sowing and before emergence, or in the early stage after corn emergence. During this period, weeds are at the emergence stage and are easily killed on contact with the herbicide; spraying after the weeds have emerged will give less satisfactory results.
III. Application rate:
Common dosage: 165 grams of 40% suspension concentrate or 150 milliliters of 48% Chucaowei suspension concentrate per mu. However, for plots with higher wheat stubble left by mechanical harvesting, the dosage should be appropriately increased, using 200 grams of 40% suspension concentrate or 175-200 milliliters of 48% Chucaowei suspension concentrate per mu. It is strictly forbidden to burn wheat stubble, to prevent the burned wheat ash from reacting with the herbicide and reducing its efficacy.
IV. Application techniques:
When applying the herbicide, it must be used when field moisture is relatively high after irrigation or rainfall. It is best to irrigate immediately after corn sowing, and spray 2-3 days after irrigation. When mixing the herbicide, shake it thoroughly and evenly, then calculate the amount based on the area to be treated and measure it accurately. First add a small amount of water to dilute the agent into a stock solution, then mix with 40-50 kilograms of water per mu according to the dosage, stir evenly, and spray uniformly on the soil surface. When spraying, in order not to destroy the herbicide film, walk backward and spray while retreating.
V. Precautions:
1. It is best to use a sprayer, with sufficient water volume, and spray evenly. Do not spray repeatedly or miss spots, and avoid spraying in windy weather.
2. It should not be used when corn is just emerging, in corn seed production fields, or on sandy soil, to avoid herbicide damage.
3. After spraying, a herbicide film forms on the soil surface; do not cultivate the soil in a way that destroys the herbicide film.
4. Spraying is best done before 10 a.m. or after 4 p.m., to avoid evaporation of the herbicide solution or damage to the herbicide film.
5. If heavy rain occurs within 24 hours after application, respray promptly.
6. In plots with many purple nutsedge (that is, Cyperus rotundus) plants, MCPA should be selected for directed spraying control at the later stage.
7. After spraying, promptly clean the spray equipment with alkaline water to avoid harming other crops.
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