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DREXEL
Atrazine 4L Herbicide
Atrazine 4L Herbicide is a post-emergent and pre-emergent herbicide designed to control annual broadleaf and grass weeds growing on croplands, home lawns, ornamental turf, and rights-of-way. It can be applied aerially or on the ground.
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Atrazine 4L Product Page
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10/29/25
10/29/25
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This product is a restricted use herbicide that can only be purchased and applied by certified applicators.
Atrazine 4L Herbicide, manufactured by Drexel Chemical Company, is a restricted-use, post-emergent, pre-emergent herbicide that controls annual broadleaf and grass weeds in cornfields, sugarcane fields, and turfs.
The active ingredient, Atrazine, will kill weeds as seeds or kill emerging weeds through the root system. Atrazine 4L Herbicide will control barnyard grass, chickweed, henbit, and more.
Atrazine 4L Herbicide is a flexible product that can be mixed, measured, and applied in different ways to prevent unwanted vegetation from taking over crops and ornamental turfs.
Tools Needed
You will need a backpack sprayer, handheld pump sprayer, hose-end sprayer or professional skid sprayer is needed.
When applying Atrazine 4L to residential lawns, a handheld pump sprayer or backpack sprayer is recommended.
How to Use
- Step 1: Determine how much Atrazine 4L Herbicide to use by measuring the square footage of the treatment area. To do this, measure the treatment areas' length and width in feet, then multiply them together (length X width = square footage). Atrazine 4L's label recommends applying the product at 1.5 fl. oz. per 1,000 square feet in a gallon of water or 4 pints per acre in 15 gallons. For example, if you have a 3,000-square-foot area to be treated, you would need 4.5 ozs of Atrazine mixed with 3 gallons of water. To treat 3 acres, you need 12 pints in at least 45 gallons of water.
- Step 2: Start the mixing and agitation and pour the correct amount of product into the spray tank. Fill the spray tank with water until it is about 90% full, and then add emulsifiable oil, oil concentrate, or tank-mix herbicides after thoroughly mixing the product. The type of crop and land areas being treated will determine the required amount of additives and whether the treated area requires irrigation. Fill the rest of the tank with the remaining water and agitate to ensure it is well-mixed.
- Step 3: Apply the mixture to designated areas, preferably in a fan nozzle spray setting, for even coverage until all or most of the solution is used.
Where to Use
Atrazine 4L Herbicide can be applied to specific cropland areas where corn, ornamentals, sugarcane, and other crops grow. It can also be applied to turfs and commercial and home lawns.
When to Use
The best times to apply will be determined by the targeted weeds being controlled. This product should only be applied during the dormant season of the area being treated.
Do not apply to turf grasses if the area is infested with diseases or insects.
Safety Information
Atrazine 4L Herbicide is safe to use around children and pets when applied according to the product label instructions. Always wear the proper personal protective equipment when mixing and applying this product.
Do not allow people or pets to enter the treated area until the sprays are completely dry.
Special Considerations
Atrazine 4L Herbicide can only be purchased and applied by Certified Applicators. Before applying Atrazine 4L Herbicide, always read the product label to make sure the correct application rate and method are being used. Total pounds of Atrazine applied must not exceed 2.5 pounds per acre per year.
| Availability | Online |
| Restricted Use | Yes |
| Shipping Restrictions * = not registered** = restricted use | 2.5 Gallon: AK*, CA**, CT**, DC*, HI*, ID**, KA**, KY**, MA**, MI*, NY*, OR**, VT**, WA** |
| Brand | DREXEL |
| Keith's Pro Tips | "Within 1 year, sorghum and corn are the only crops that can be planted in areas where Atrazine 4L Herbicide has been applied. Other crops can be planted after 1 year." |
| Product Drawbacks | Atrazine 4L Herbicide is a restricted product and can only be purchased and used by Certified Applicators. We recommend uncertified DIY homeowners to use TopShot Weed Killer to treat residential lawns. |
| Target Pests | Atrazine 4L Herbicide controls the following: Annual Bluegrass, Annual Morning Glory, Annual Morningglory, Barnyardgrass, Big Bluestem, Bluegrama, Buttonweed, Chickweed, Cocklebur, Common Chickweed, Crabgrass, Cransbil, Cudweed, Dichondra, Downy Brome, Eastern Gramagrass, Fall Panicum, Field Pennycress, Fireweed, Flora's Paintbrush, Florida Bentony, Foxtail, Giant Foxtail, Green Foxtail, Ground Cherry, Henbit, Indiangrass, Japanese Brome, Jimsonweed, Junglerice, Kentucky Bluegrass, Knotweed, Kochia, Lambsquarters, Large Crabgrass, Lespedeza, Little Bluestem, Moneywort, Mouse-ear Chickweed, Mustard, Narrowleaf Vetch, Night shade, Panicum Capillare, Parsleypiert, Pigweed, Poa Annua, Prickly Lettuce, Purslane, Quackgrass, Ragweed, Sand Lovegrass, Sandspur, Sicklepod, Side-Oats Grama, Smooth Brome, Smutgrass, Sprweed, Spurge, Spurweed, Sunflower, Swinecress, Switchgrass, Various Annual Clovers, Velvetleaf, Watergrass, Western Wheatgrass, Wild Oats, Wiregrass, Witchgrass, Woodsorrel, and Yellow Foxtail. |
| Application Equipment | Backpack Sprayer, Gloves, Hose End Sprayer, Pump Sprayer, Respirator Mask, Spray Rig |
| Application Methods | Broadcast Spray, Crack & Crevice, Spot Treatment |
| Active Ingredient | Atrazine 42.2%, related compounds- 0.8% |
| Product Type | Herbicide |
| Formulation | Suspended Concentrate |
| Application Rate | Application rates can vary depending on the type of crop or land area being treated and the type of application method being used. Generally, you will put down 64 ounces per acre. It is recommended to use 20 to 60 gallons of water at a maximum pressure of 35 to 40 PSI. For home lawns, the typical rate is 1.5 ounces per 1,000 square feet. See label for full use and more specific application instructions. For more specific application rates please refer to the label. |
| Shelf Life | Atrazine 4L Herbicide will last for up to 1 to 2 years when stored according to the product label. Store Atrazine 4L Herbicide in a cool, dry storage area. |
| Yield | The yield for Atrazine 4L Herbicide depends on the type grass or cropland the product will be applied to. For most applications, 0.6 to 0.75 ounces of Atrazine 4L will treat up to 500 square feet, and 64 ounces of Atrazine will treat up to 1 acre. |
| Use Sites | Outdoors |
| Time to Kill | Results of using Atrazine 4L Herbicide can be seen within 5 to 7 days. |
| Comparable Products | Simazine 4L |
| Use Caution With | Bentgrass, Kentucky Bluegrass, Fescue, Fine, Fescue, Tall, Ryegrass |
| EPA Registration # | 19713-11 |
| Restricted Use | Yes |
|---|---|
| Shipping Restrictions | AK, CT, DC, HI, KA, KY, MA, MI, NY |
| Availability | Online |
| Signal Word | CAUTION |
| Keith's Pro Tip | "Within 1 year, sorghum and corn are the only crops that can be planted in areas where Atrazine 4L Herbicide has been applied. Other crops can be planted after 1 year." |
| Target Pests Multi | Alexandergrass, Amaranth, Annual Bluegrass, Annual Broomweed, Annual Clover, Annual Ragweed, Annual Thistle, Artillery Weed, Barnyardgrass, Black Nightshade, Bur Clover, Buttonweed, Carelessweed, Carpet Burweed, Cheat, Cheatgrass, Chickweed, Cocklebur, Common Chickweed, Common Lambsquarters, Corn Speedwell, Crabgrass, Cransbill, Cudweed, Dichondra, Downy Brome, Fall Panicum, Field Pennycress, Fireweed, Flora's Paintbrush, Florida Betony, Foxtail, Giant Foxtail, Green Foxtail, Ground Cherry, Hairy Crabgrass, Henbit, Hop Clover, Horseweed/Marestail, Japanese Brome, Jimsonweed, Junglerice, Kentucky Bluegrass, Knotweed, Kochia, Lambsquarters, Large Crabgrass, Lespedeza, Little Barley, Moneywort, Mouseear Chickweed, Narrowleaf Vetch, Nightshade, Parsley Piert, Pigweed, Poa Annua, Poorjoe, Prickly Lettuce, Purslane, Quackgrass, Ragweed, Russian Thistle, Sandspur, Seeding Dock, Sicklepod, Smartweed, Smooth Brome, Smutgrass, Spanishneedles, Spiny Amaranth, Spurge, Spurweed, Sunflower, Swinecress, Velvetleaf, Volunteer Wheat, Watergrass, Wild Buckwheat, Wild Lettuce, Wild Oats, Wild Sunflower, Wiregrass, Witchgrass, Woodsorrel, Yellow Foxtail, Mustard |
| Time to Kill | Results of using Atrazine 4L Herbicide can be seen within 5 to 7 days. |
| Chemical Type | Herbicide |
| Formulation | Suspended Concentrate |
| Application Methods | Broadcast Spray, Crack & Crevice, Spot Treatment |
| Product Drawbacks | Atrazine 4L Herbicide is a restricted product and can only be purchased and used by Certified Applicators. We recommend uncertified DIY homeowners to use TopShot Weed Killer to treat residential lawns. |
| Active Ingredient | Atrazine 42.2%, related compounds- 0.8% |
| Application Equipment | Backpack Sprayer, Gloves, Hose End Sprayer, Pump Sprayer, Respirator Mask, Spray Rig |
| Mix Rate | Application rates can vary depending on the type of crop or land area being treated and the type of application method being used. Generally, you will put down 64 ounces per acre. It is recommended to use 20 to 60 gallons of water at a maximum pressure of 35 to 40 PSI. For home lawns, the typical rate is 1.5 ounces per 1,000 square feet. See label for full use and more specific application instructions. For more specific application rates please refer to the label. |
| Use Sites | Outdoors |
| Yield | The yield for Atrazine 4L Herbicide depends on the type grass or cropland the product will be applied to. For most applications, 0.6 to 0.75 ounces of Atrazine 4L will treat up to 500 square feet, and 64 ounces of Atrazine will treat up to 1 acre. |
| EPA Registration No. | 19713-11 |
| Shelf Life | Atrazine 4L Herbicide will last for up to 1 to 2 years when stored according to the product label. Store Atrazine 4L Herbicide in a cool, dry storage area. |
| Comparable Products | Simazine 4L |
| Children or pets? | No |
| Property Characteristics | None |
*Price does not include freight. We guarantee our rate plus shipping will be less than anyone else's price.