Knowing exactly how much Roundup per acre to apply is crucial for effective weed control while minimizing costs and environmental impact. This guide covers everything from basic mixing rates to advanced application strategies for different agricultural scenarios.
Understanding Roundup Application Rates
Roundup (glyphosate) application rates vary based on formulation, target weeds, crop stage, and environmental conditions. The standard rate typically falls between 22-44 fluid ounces per acre for most agricultural applications.
Standard Roundup Per Acre Rates by Crop
| Crop/Use | Roundup Product | Rate (per acre) | Water Volume |
|---|---|---|---|
| Corn (Roundup Ready) | Roundup PowerMAX | 22-32 fl oz | 10-20 gallons |
| Soybeans (Roundup Ready) | Roundup PowerMAX | 22-44 fl oz | 10-20 gallons |
| Burndown (pre-plant) | Roundup WeatherMAX | 22-32 fl oz | 10-15 gallons |
| Grass Control | Roundup Pro Concentrate | 1.5-2.5 quarts | 10-40 gallons |
| Alfalfa (RR) | Roundup PowerMAX | 22-44 fl oz | 10-15 gallons |
| Food Plots | Roundup Super Concentrate | 2-3 quarts | 20-40 gallons |
How Much Roundup Per Acre for Specific Scenarios
1. How Much Roundup Per Acre for Corn
For Roundup Ready corn, the standard rate is 22 fluid ounces per acre. Under heavy weed pressure or for larger weeds (over 6 inches), increase to 32 fl oz/acre. Always apply with at least 10 gallons of water per acre for adequate coverage.
2. How Much Roundup Per Acre for Soybeans
Soybeans typically require 22-44 fl oz/acre depending on weed species and size. For glyphosate-resistant weeds like waterhemp or palmer amaranth, use the higher rate (44 fl oz/acre) with appropriate tank mix partners.
3. How Much Roundup Per Acre to Kill Grass
For complete grass control in non-crop areas, use 2-3 quarts of Roundup Pro Concentrate per acre. For pasture renovation or grass sods, 1.5-2 quarts per acre is typically sufficient when applied at the right growth stage.
4. How Much Roundup Per Acre for Burndown
Pre-plant burndown applications generally require 22-32 fl oz/acre of Roundup WeatherMAX or PowerMAX. Add residual herbicides for extended control in no-till situations.
Cost Analysis: How Much Does Roundup Cost Per Acre?
Roundup Cost Per Acre Calculator
The cost of how much roundup per acre depends on product price, application rate, and additional chemicals. Below is a typical cost breakdown:
Cost Factors:
- Roundup PowerMAX: $25-35/gallon
- Application service: $8-15/acre
- Adjuvants: $1-3/acre
- Tank mix partners: Variable
Typical Cost Range:
- Low end: $15-20/acre (22 fl oz rate)
- Average: $20-30/acre (32 fl oz rate)
- High end: $30-45/acre (44 fl oz + additives)
Mixing Instructions: How Much Roundup and Water Per Acre
Proper mixing is essential for effective weed control. Here's a standard mixing guide:
Standard Mixing Example (10-gallon spray volume):
For 22 fl oz/acre rate: Add 22 fl oz Roundup + necessary adjuvants to 2.5 gallons water, then fill to 10 gallons total volume per acre.
For 32 fl oz/acre rate: Add 32 fl oz Roundup + adjuvants to 2.5 gallons water, fill to 10 gallons total.
Note: Always add Roundup to the spray tank first, then add other products according to label instructions.
Expert Application Tips for Optimal Results
Best Practices
- Apply when weeds are actively growing
- Use clean water with pH 5-7
- Apply during daylight hours (60-85°F ideal)
- Allow 6-8 hours rain-free period
- Calibrate equipment regularly
Avoid These Mistakes
- Don't apply during drought stress
- Avoid hard water without conditioner
- Don't mix incompatible products
- Avoid drift to non-target plants
- Don't exceed maximum annual rate