Protect Soybean Yields by Eliminating Weeds Early;
 Sonic® Herbicide Proven to Perform and Enhance Control

INDIANAPOLIS — April 30, 2013 —Which weed troubles you the most? The answer is any weed taller than 2 to 4 inches. Beyond this height, controlling a variety of species becomes difficult, and in soybeans, postemergence options are limited. Sonic®herbicide controls weeds preemergence plus delivers residual activity that enhances the performance of post applications by keeping weeds smaller and easier to control. 

Every inch of weed growth counts against yield. Early weed competition robs developing soybean plants of sun, water and nutrients. Southern Illinois University research shows 6 to 8 inches of dense weed growth can cause 4 to 5 bushels per acre of lost yield — and profit. 

Growing Demands

Considering today’s market prices, soybean growers are motivated to protect their soybean fields and yield potential. Global demand is rising for soybeans and crop protection products.

Growth for soybean exports has predominantly come from China over the past decade, according to the Iowa Soybean Review. China accounts for 30 percent of the world’s soybean consumption, representing a market that first became an opportunity in 2000 for U.S. soybean farmers.

Fact: Even with this increased demand, less than 50 percent of soybean fields currently receive a preemergence herbicide. Many fields could still benefit from the added protection against tough and resistant weeds that are continuing to spread.1

Sonic herbicide controls weeds preemergence and delivers residual activity that enhances the performance of post applications by keeping weeds smaller and easier to control. This is important in soybeans, as postemergence options are limited. 

Retailers such as Nick Saathoff of Heritage FS in Bourbonnais, Ill., find applying a residual herbicide provides a valuable window of time to manage workloads, attend to other activities or wait out the weather.

“By spraying the Sonic preplant, we’ve got 45 days before we have to worry about going in for a spray of glyphosate application,” says Saathoff. “Therefore, the weeds are smaller when we spray with the glyphosate like Durango and much easier to control.”

Watch the video to hear more advice about weed control in soybeans.

In addition to saving time, programs using residual herbicides offer additional benefits to soybean growers over glyphosate-only programs.

Proven Two-pass Advantages

A two-pass weed control program including Sonic is proven to stop difficult-to-control and resistant weeds more effectively than a glyphosate-only program. The residual activity provides growers with a wide window which allows postemergence applications to be made at the right time on weeds that are smaller and easier to control. 

Research shows that by incorporating Sonic in a two-pass program, growers can effectively control a broad spectrum of high-anxiety weeds such as lambsquarters, marestail, pigweed, ragweed, velvetleaf and waterhemp.

Results taken from 2011 University Field Research spanning 14 states: DE, IA, IL, IN, KS, MD, MN, MO, NE, OH, PA, SD, VA, WI.

For the latest herbicide-resistant weed information, visit To learn more about Sonic®herbicide, visit or contact your local ag retailer.

About Dow AgroSciences
Dow AgroSciences, based in Indianapolis, Indiana, USA, develops leading-edge crop protection and plant biotechnology solutions to meet the challenges of the growing world. Dow AgroSciences is a wholly owned subsidiary of The Dow Chemical Company and had annual global sales of $6.4 billion in 2012. Learn more at Follow Dow AgroSciences on Facebook and YouTube or subscribe to our News Release RSS Feed.