Growth regulator herbicides for burndown applications

decrease font size  Resize text   increase font size       Printer-friendly version of this article Printer-friendly version of this article

Weeds can be controlled prior to planting corn or soybean by using preplant tillage, herbicides, or both, according to Aaron Hager, associate professor of weed science at the University of Illinois.

Weed control may be improved when more than one active herbicide ingredient is included in the burndown application. Burndown applications often include growth-regulator herbicides, such as 2,4-D. Both amine and ester formulations of 2,4-D are labeled for preplanting burndown applications, but the ester formulation is usually preferred over the amine formulation.

Hager explains, “The low water solubility of an ester makes it less likely to be moved into the soil by precipitation, where it could injure germinating crop seeds.” Also, esters are better able to penetrate the waxy surfaces of weed leaves, so they provide better control of large weeds, especially when air temperatures are cool.

Some 2,4-D ester formulations can be applied without a waiting period before planting corn, while a seven-day wait is recommended for others. “When applied prior to planting soybean, wait at least seven days between application of one pint per acre and planting, or 15 to 30 days between application of up to two pints per acre and planting,” said Hager. “Pay careful attention to label statements of any 2,4-D formulation used prior to crop planting.”

Some retail applicators might be experiencing difficulty acquiring sufficient quantities of 2,4-D to meet the need for burndown applications. “Substituting an amine formulation of 2,4-D for an ester formulation is possible,” Hager said, “but remember, there are significant differences between these formulations.” Specifically:

  • Higher application rates might be necessary because an amine formulation does not penetrate the weed’s leaf cuticle as easily as an ester formulation does,
  • Amine formulations are less volatile but more water soluble than ester formulations, meaning that they are more likely to move into the soil after precipitation, increasing the likelihood of crop injury,
  • The interval between application of 2,4-D amine and soybean planting is longer (15 days for one pint or less, 30 days for greater than one pint) than the interval with ester formulations.

Dicamba is another growth-regulator herbicide used to control existing vegetation before planting. Several commercially available products contain dicamba, but not all of them are labeled for application prior to crop (especially soybean) planting.

“In comparison with 2,4-D, dicamba provides greater control of chickweed, henbit and prickly lettuce, comparable control of dandelion, and less control of horseweed and mustard species,” said Hager.

Application rates used in burndown applications can impact the interval between application and planting. For example, Clarity can be applied at up to 16 fluid ounces per acre before planting corn (up to eight fluid ounces on coarse soils or medium- and fine-textured soils with less than 2.5 percent organic matter) with no interval between application and planting. However, the 16-ounce use rate requires a minimum accumulation of one inch of precipitation and a 28-day waiting interval between application and soybean planting. An eight-ounce application rate still requires a minimum accumulation of one inch of precipitation, but the waiting interval is only 14 days. These intervals must be observed prior to planting soybean or crop injury might occur.


Prev 1 2 Next All



Buyers Guide

Doyle Equipment Manufacturing Co.
Doyle Equipment Manufacturing prides themselves as being “The King of the Rotary’s” with their Direct Drive Rotary Blend Systems. With numerous setup possibilities and sizes, ranging from a  more...
A.J. Sackett Sons & Company
Sackett Blend Towers feature the H.I.M, High Intensity Mixer, the next generation of blending and coating technology which supports Precision Fertilizer Blending®. Its unique design allows  more...
R&R Manufacturing Inc.
The R&R Minuteman Blend System is the original proven performer. Fast, precise blending with a compact foot print. Significantly lower horsepower requirement. Low inload height with large  more...
Junge Control Inc.
Junge Control Inc. creates state-of-the-art product blending and measuring solutions that allow you to totally maximize operating efficiency with amazing accuracy and repeatability, superior  more...
Yargus Manufacturing
The flagship blending system for the Layco product line is the fully automated Layco DW System™. The advanced technology of the Layco DW (Declining Weight) system results in a blending  more...
Yargus Manufacturing
The LAYCOTE™ Automated Coating System provides a new level of coating accuracy for a stand-alone coating system or for coating (impregnating) in an automated blending system. The unique  more...
John Deere
The DN345 Drawn Dry Spreader can carry more than 12 tons of fertilizer and 17.5 tons of lime. Designed to operate at field speeds up to 20 MPH with full loads and the G4 spreader uniformly  more...
Force Unlimited
The Pro-Force is a multi-purpose spreader with a wider apron and steeper sides. Our Pro-Force has the most aggressive 30” spinner on the market, and is capable of spreading higher rates of  more...
BBI Spreaders
MagnaSpread 2 & MagnaSpread 3 — With BBI’s patented multi-bin technology, these spreaders operate multiple hoppers guided by independent, variable-rate technology. These models are built on  more...


Comments (0) Leave a comment 

Name
e-Mail (required)
Location

Comment:

characters left


Blend and Bulk Tower Systems

Waconia Towers provide speed, efficiency and reliability that only gravity-fed systems can offer. Towers are available with up to 300 ... Read More

View all Products in this segment

View All Buyers Guides

Feedback Form
Feedback Form