Burndown Guidance​​​​​​​​

Start With Clean Fields At Planting​​

Weeds that emerge prior to or during planting are the most threatening to soybeans. Weeds can reduce soybean yield by 1% per day if left uncontrolled after V2-V3 stages of soybean growth*. Starting with clean fields at planting is an essential part of sustainably managing weeds in soybeans and protecting your yields.

*Knezevic, S.Z. et al. 2003. Yield penalty due to delayed weed control in corn and soybean. Plant Management Network. Online: www.plantmanagement network.org

Residuals

Tillage alone might not completely destroy established weeds. This can result in early weed competition as well as reduced herbicide efficacy. To remove early weed infestations, you must combine a burndown application with a residual herbicide tank mix or tillage.

2,4-D or dicamba may be required in burndown tank mixtures for tough-to-control weeds.

If emerged weeds are present at planting, a residual herbicide may be tank-mixed with Roundup® brand agricultural herbicides. There are various options to consider depending on the situation.

Temperature

For best burndown efficacy, apply during optimum temperatures:


Night temperatures
above 40°F

Day temperatures in the
high 50s to low 60s

Timing

Burndown applications should occur at least two weeks before planting to allow plant material to decompose. Refer to individual product label for all instructions, including plant-back restrictions.

Nozzle Selection

Proper nozzle selection is important to both weed management and improved drift reduction. There are many nozzle types available, but the list below are approved nozzles based on Monsanto wind tunnel testing (Hewitt, U. of Queensland, August 2012) with experimental glyphosate and dicamba premix and tank mix formulations. These nozzles produce droplets in the very coarse to ultra coarse category.

AIXR TeeJet - Very Coarse

AIXR - TeeJet
Very Coarse
PSI: 30-50,
Orifice size: 004, 005

DR Wilger - Very Coarse

DR - Wilger
Very Coarse
PSI: 30-50,
Orifice Size: 003, 004, 005
*cawidth modulation systems

Air Max Greenleaf - Very Coarse

Air Max - Greenleaf
Very Coarse
PSI: 30-50,
Orifice Size: 003, 004, 005

TDXL Greenleaf - Very Coarse

TDXL - Greenleaf
Very Coarse
PSI: 30-50,
Orifice Size: 003, 004, 005

AI/AIC (110 DEGREE) TeeJet - Very Coarse

AI/AIC - TeeJet
Very Coarse
PSI: 30-50,
Orifice Size: 003, 004, 005

TTI Teejet - Ultra Coarse

TTI - Teejet
Ultra Coarse
PSI: 30-50,
Orifice size: 003, 004, 005

AI (80 DEGREE) TeeJet - Extremely Coarse

AI - TeeJet
Extremely Coarse
PSI: 30-50,
Orifice size: 003, 004, 005

ULD Hypro - Extremely Coarse

ULD - Hypro
Extremely Coarse
PSI:PSI: 30-50,
Orifice Size: 003, 004, 005

AITT J60 TeeJet - Extremely Coarse

AITT J60 - TeeJet
Extremely Coarse
PSI: 30-50,
Orifice Size: 003, 004
, 005

Proper nozzle selection can help minimize drift potential when used with low volatility dicamba formulations with coarse and ultra coarse spray nozzles. Learn more about the importance of this in the following video.

Application Requirements

Chemistry Application Window 

Spraying weeds at 4 inches or less is the optimal time for maximum weed control. Although you can spray up to R1 in soybeans, that should not be the deciding factor on when to spray. Weed size is the key factor not soybean plant height of growth stage.

Spray weeds less than 4 inches tall

Spray weeds less than 4 inches tall

Maintain the required label buffer to protect sensitive areas

Maintain the required label buffer to protect sensitive areas

Make sure ground speed is less than 15mph

Make sure ground speed is less than 15mph

Use triple rinse tank clean-out procedure

Use triple rinse tank clean-out procedure

Maintain boom height 20 inches above crop canopy

Maintain boom height 20 inches above crop canopy

Apply when wind speed is between 3 and 10 mph

Apply when wind speed is between 3 and 10 mph

Use low-volatility formulations such as Roundup® Xtend™ and XtendiMax™, upon their registration

Use low-volatility formulations such as Roundup® Xtend™ and XtendiMax™, with VaporGrip™ Technology, upon their registration. Learn more.

Use spray nozzles and operating pressures that produce very coarse to ultra-coarse droplets to help minimize drift

Use spray nozzles and operating pressures that produce very coarse to ultra-coarse droplets to help minimize drift

Always read and follow label directions. Pending regulatory approval. Anticipated application requirements pending final label approval. This information is current as of July 2012.

1Knezevic, S.Z. et al. 2003. Yield penalty due to delayed weed control in corn and soybean. Plant Management Network. Online: www.plantmanagement network.org

2Small-seeded broadleaf weeds, including waterhemp, lambsquarters and Palmer pigweed. Results may vary, depending on rainfall and soil type. For best results, combine with a recommended residual product.​