Soybeans Under Siege

Yield loss. This is never something your growers want to hear, but it is even worse when soybean prices remain high. Studies have shown the value of early-season weed management is critical in maximizing soybean yield potential. Appropriately timed herbicide applications can help growers manage glyphosate-resistant weeds and improve their bottom line.

This was the subject of CropLife Media Group’s recent Webinar, “Soy­beans Under Siege: The Econo­mics Of Early-Season Weeds,” presented by Bryan Young, professor, Southern Illinois University, Kevin Bradley, associate professor, University of Missouri, and Bob Kacvinsky, technical support representative, Syngenta Crop Protection. The speakers provided key insight on how to protect soybean yield and increase profits.

Residual Herbicides

In systems where glyphosate is not providing the effectiveness of weed control as it has in the past, there’s a lot of value in the use of residual herbicides in the spring, said Young during the Webinar, which was sponsored by Syngenta.

“Growers need to look at soil residual herbicides that diversify their approach to weed management,” he said. “Soil residual herbicides can help manage your risk and improve yield. They also delay the onset of any glyphosate-resistant weed species.”

Delayed applications of gly­phosate in soybeans not only affects the return on herbicide investment, but impacts other costs as well, Young said.

“It’s not just about return on your herbicide dollar invested, it’s also about all of the variable costs invested on each acre, including seed, fertilizer, land use, and labor,” he said. “If you can spend more money on residual herbicides, it’s going to return more money on all of your investments.”

Choosing the right residual herbicide to manage weeds is also important, Young said.

“My advice is to select a residual herbicide that will address your primary weed species present in the field,” he said. “There are several different soil-residual herbicide options, so make sure you are buying one that is most effective for your target weed.”

Young also discussed field trial results that examined one-pass vs. two-pass glyphosate programs, including programs that used pre-emergent herbicide treatments.

“For long-term weed management, growers can make more consistent, timely applications using the pre-emergent program, followed by post-emergent glyphosate,” he said.

Managing Glyphosate Resistance

Both Young and Bradley offered best strategies to deter glyphosate-resistance weeds.

“I recommend making glyphosate work the first time with timely applications,” Young said. “Soil residual herbicides can reduce the number of weeds by the time you apply glyphosate, making sure the weeds aren’t too big. In doing so, we can also expose fewer weeds to glyphosate, which reduces the odds of resistance.”

Bradley added: “You want to reduce the selection pressure, which reduces the number of weeds that get sprayed with glyphosate in the first place,” he said. “That should really be your goal — preventing resistant weeds in the future, as well as controlling resistant weeds that are already there.”

Bradley said there are a couple of key reasons why he recommends growers in Missouri, which now have widespread populations of glyphosate-resistant waterhemp, use pre-emergent herbicide programs.

“First is the economics of it. You can make more money using a pre-emergence herbicide when you have glyphosate-resistant weeds in the field,” he said, “Secondly, it is a much more effective way to deal specifically with glyphosate-resistant waterhemp. It is more effective than trying to control the weed in-crop with glyphosate and some other tank-mix partner.”

Syngenta Learning Center

Kacvinsky shared results from ongoing research on soybean weed management conducted at the Syngenta Learning Center in York, NE.

“It’s important to remember that weeds typically outnumber crops,” he explained. “Weeds compete directly with soybeans for three main areas — nutrients, water, and space/sunlight.”

Studying soil moisture at the Learn­ing Center, Kacvinsky said they’ve concluded two rules of thumb when working with water sensors.

“First, we’ve found that three-inch tall weeds can remove one inch of moisture every three days,” he said. “Secondly, for every inch of water removed by soybeans, weeds will remove three inches of water. Even under irrigation, the loss of water from weed competition has a cost associated with it. At some point, you’re going to have to replace that water.”

Leave a Reply

Herbicides Stories

Crop InputsMonsanto, FMC Expand Roundup Ready PLUS Platform
August 31, 2015
FMC Corp. and Monsanto Co. announced today an expanded agreement to continue their participation in the Roundup Ready PLUS Crop Read More
HerbicidesREUTERS: Anti-GMO ‘Scientist’ Calls For New Review Of Glyphosate
August 20, 2015
EDITORS NOTE: We feel that it is important to note that there are those that believe one of the lead Read More
Mature Waterhemp in Corn
HerbicidesAustralia’s Seed Destructor Could Be Midwest’s New Tool Against Weed Resistance
August 17, 2015
It’s a piece of equipment that probably isn’t on many Midwest farmers’ radars at this time, but could eventually be Read More
HerbicidesExpert: IARC Herbicide Classifications Leading To Confusion, Misinformation
July 24, 2015
Few people in the crop protection industry had heard of the International Agency for Research on Cancer (IARC) before this Read More
Top 100 Articles
Crop InputsLand ‘O Lakes, United Suppliers Finalize Merger
August 24, 2015
According to a press release on August 24, owners of United Suppliers, Inc. and members of Land O’Lakes, Inc. “have Read More
West Central Cooperative, Jefferson, IA
CropLife 100Iowa Cooperatives To Explore Unification
August 19, 2015
The boards of directors at two of Iowa’s leading farmer-owned cooperatives yesterday signed a letter of intent to study the Read More
CropLife 100Southern States Coop Hosting Drone Flight This Friday
August 3, 2015
Southern States Cooperative — No. 9 on the CropLife 100 — is hosting an FAA-approved drone demonstration at Grandview Farms Read More
CropLife 100Aligned Ag Distributors Adds Four New Owners
July 30, 2015
Aligned Ag Distributors LLC has announced the addition of four new customer/owners to Franklin Holding Co. LLC. They are: The Read More
CropLife 100Pinnacle Purchases California-Based Specialty Crops Retailer
July 20, 2015
Pinnacle Agriculture Holdings has successfully acquired California-based NH3 Service Co.  Operating as part of Pinnacle’s Performance Agriculture brand, the new locations Read More
Asmus Farm Supply liquid fertilizer facility features 20,000 square feet
CropLife 100Slideshow: Asmus Farm Supply Shows Off Its New Liquid Fertilizer Facility
July 15, 2015
Asmus Farm Supply, Rake, IA, recently added a new liquid fertilizer facility to its company operations. The new liquid fertilizer Read More
Latest News
ManagementReviewing MAGIE 2015
September 2, 2015
CropLife Editor Eric Sfiligoj talks what he saw at the recent Midwest AG Industries Exposition (MAGIE) show. Read More
Melissa Olds Dow AgroSciences
Crop InputsDow AgroSciences: Highlighting The Past, Present & …
September 2, 2015
In general, media events held by large agricultural suppliers tend to focus primarily on what plans the company has in Read More
Mobile tablet
OpinionTaking Data Head On
September 2, 2015
As you read this column, I’m hoping that if you picked up the phone and gave me a call, you’d Read More
Young soybean field
Industry NewsArysta LifeScience Announces New Business Unit Head For…
September 1, 2015
Arysta LifeScience North America announces the addition of Rico Christensen, Business Unit Head, North America. Christensen will have responsibility for Read More
Wilbur Ellis Pink Soybean Seed Treatment
Crop InputsWilbur-Ellis Goes Pink With Soybean Seed Treatments For…
September 1, 2015
This past year, proceeds of pink-dyed soybeans treated and sold to Wilbur-Ellis seed customers in Chester, SD, went to two Read More
SprayersNORAC Active Wing Roll Slated For More Sprayers
September 1, 2015
NORAC Systems, a member of the Topcon Positioning Group, announces the release of Active Wing Roll for RoGator, Apache, New Read More
Syngenta Sign
FungicidesSyngenta’s Newest Fungicide Receives EPA Approval
September 1, 2015
Syngenta announced today that its newest succinate dehydrogenase inhibitor (SDHI) fungicide – Solatenol – has received registration from EPA and Read More
Flooded corn in Indiana
Crop InputsDelaying The Fertilizer Decision
September 1, 2015
Comments gathered from several retailers recently evidenced a classic good-news-bad-news scenario. Good news is prices and supplies of nitrogen, phosphate, Read More
StewardshipBee Buffer Strip Initiative Seeks 100 Ohio Farmers
August 31, 2015
The U.S. Bee Buffer Project, an initiative of the Pollinator Partnership (P2), Burt’s Bees and The Burt’s Bees Greater Good Read More
2015 ShowStopper Award, MAGIE
EquipmentA ShowStopper From Case IH: The Patriot 2250
August 31, 2015
For nine years now, visitors to the yearly Midwest AG Industries Exposition (MAGIE) show have been tasked with not only Read More
Crop InputsMonsanto, FMC Expand Roundup Ready PLUS Platform
August 31, 2015
FMC Corp. and Monsanto Co. announced today an expanded agreement to continue their participation in the Roundup Ready PLUS Crop Read More
Deere Nutrient Applicator
Eric SfiligojThe Good & Bad News From MAGIE
August 31, 2015
As I write this column, I’ve just returned from the annual Midwest AG Industries (MAGIE) trade show in Bloomington, IL. Read More
CPS Morenci receiving its 4R certification
StewardshipCPS Morenci Becomes First Michigan Facility Certified I…
August 31, 2015
The 4R Nutrient Stewardship Certification Program has announced that Crop Production Services, Inc.’s facility located in Morenci, MI, has been Read More
EquipmentDeere Announces Soucy Track Distribution Alliance
August 28, 2015
John Deere announces an alliance with Soucy Track to sell and distribute products through the John Deere dealer channel. “This Read More
FertilizerFall-Applied Phosphorus: A Rooted Investment
August 28, 2015
As commodity prices decrease and input prices continue to rise, farmers are seeking more efficient strategies for meeting a high Read More
Monsanto Sign
Crop InputsWhat’s Next For Monsanto, Syngenta?
August 28, 2015
After dropping its $47 billion bid to take over Swiss agribusiness firm Syngenta, Monsanto may be turning its focus to Read More
Golden Harvest Corn stalks
Crop InputsMonsanto: Syngenta Not The Only Horse In Crop Protectio…
August 28, 2015
Monsanto Co, having ditched an audacious $46 billion (£30 billion) offer for Syngenta AG, may downshift to a humbler strategy Read More
ManagementConsolidation hits and a miss; And a look at China’s ch…
August 28, 2015
As Monsanto suspends its pursuit of Syngenta, consolidation news at the retail and distribution level heats up. CropLife magazine’s Executive Read More