Soil residual herbicide options after soybean emergence

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

With very tight windows of opportunity to plant this year, preemergence herbicides may not have been applied as planned. Application of a residual herbicide prior to planting or emergence of the crop, in both corn and soybean, is a great weed management strategy overall and also a key tool in managing against herbicide resistance. What are some of our options if soybeans emerged before a preemergence herbicide application was made?   

Most soybean preemergence herbicides with a site of action (SOA) of #14 must be applied within 3 days of planting. Note that many companies now list SOA numbers on the front page of the herbicide label. Products with this SOA that must be applied within three days of planting and prior to crop emergence include: Authority products, Enlite, Gangster, Optill, Sharpen, Fierce, and Valor. Warnings on the herbicide labels vary slightly, but essentially you can expect severe crop injury if these products are applied after soybeans have begun to crack or emerge. An exception of a product with this SOA is Prefix: This product can be applied from cracking through the 3rd trifoliate stage of soybean. 

Herbicides such as Dual II Magnum, Outlook and IntRRO have a wider window of application, and can be applied through the 3rd trifoliate in soybean. Another herbicide within this chemistry, Warrant, can be applied through the R1 stage of soybean, although the optimal time of application is the V2 to V3 stage of soybean. Note that these herbicides will not control emerged weeds. 

FirstRate is another herbicide option that can be applied postemergence, up to 50% flowering in soybean, although the optimal time of application is preemergence within 2 days after planting.  

Be sure to check herbicide labels for further information about restrictions and rates when applying products postemergence, and for any restrictions on additives, carriers and tank mix partners. 

For Corn: See the article "Soil residual herbicide options after corn emergence" for information and links to resources that address this issue in corn at:

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 

e-Mail (required)


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