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

HerbicidesScouting Key To Next Season’s Soybean Herbicide Program
August 12, 2014
When growing soybeans, growers need to think ahead to stay one step ahead of weeds. That means examining weed threats and evaluating which herbicides work best. Read More
HerbicidesArysta Touts Burndown Herbicide For Brome Management In Wheat
June 4, 2014
Arysta LifeScience North America recommends PRE-PARE Burndown Herbicide for effective brome management in winter wheat. Read More
HerbicidesFall Herbicide Applications More Effectively Manage Resistant Italian Ryegrass
May 14, 2014
Field studies show that a fall application of certain herbicides before weed emergence, leads to more successful crop planting and weed control in spring. Read More
Waterhemp in soybean stubble
HerbicidesThe Weed Resistance Problem: A Matter Of Billions
April 1, 2014
Not only is the amount of money being spent to control these yield robbers high, but the toll it has taken on the human population is growing lager by the day. Read More

Trending Articles

ManagementExpert To Discuss Farmland Value, Rent At Farm Science Review
August 18, 2014
While cropland values in Ohio increased in the past two years, they have remained flat in 2014, declining in some cases, according to an Ohio State University agricultural economist. Read More
EquipmentAdvance Your Technology IQ At MAGIE
August 13, 2014
The Midwest AG Industries Exposition (August 20-21) is the place you need to be to see, study and evaluate how new advances in the equipment, operations, crop protection and fertility sectors can help your business prosper. Read More
HerbicidesScouting Key To Next Season’s Soybean Herbicide Program
August 12, 2014
When growing soybeans, growers need to think ahead to stay one step ahead of weeds. That means examining weed threats and evaluating which herbicides work best. Read More
StewardshipMichigan Agriculture Leaders On Toledo Water Ban: We Want To Be Part Of The Conversation
August 8, 2014
Leaders of Michigan agricultural organizations said Thursday that the government should not have a “knee-jerk reaction” based on last weekend’s water ban in Toledo due to fertilizer run-off in Lake Erie. Read More
CropLife 100BRANDT Acquires Lemon Ag Services
August 4, 2014
The acquisition of Lemon Ag fits BRANDT’s aggressive corporate strategy of providing superior agronomic advice and services for customers in central Illinois. Read More
Eric SfiligojThe Resurgence Of Crop Protection
August 4, 2014
Plenty of new offerings over the next few years should see a rebirth for the crop protection products category in terms of market share. Read More

Latest News

CropLife 100Pinnacle Acquires California-Based Retailer
August 29, 2014
Pinnacle Agriculture Holdings will acquire Kerman Ag Resources, Inc., which will operate under Pinnacle's Performance Agriculture brand. Read More
Allied Cooperative Grain Plant
ManagementArcadia Co-op To Merge With Allied Cooperative
August 28, 2014
Allied Cooperative has announced that members of Arcadia Co-op voted in favor of a merger with Allied Cooperative, paving the way for the consolidation which will be effective on December 1, 2014. Read More
InsecticidesBioinsecticide VENERATE Now Registered In California
August 27, 2014
Marrone Bio Innovations' VENERATE is a new tool to help California growers control crop-damaging insect pests, fight the development of insect resistance and reduce pesticide residues on fruits and vegetables. Read More
CropLife 100Two Iowa-Based Ag Co-ops To Merge
August 27, 2014
The Board of Directors and management of United Western Coop, Missouri Valley, IA has completed a merger with Heartland Co-op, West Des Moines, IA, effective September 1, 2014. Read More
FertilizerKoch Expands AGROTAIN Nitrogen Stabilizer Portfolio
August 26, 2014
Koch Agronomic Services, LLC has added two new innovative nitrogen stabilizers to the AGROTAIN product family – AGROTAIN ADVANCED and AGROTAIN DRI-­MAXX. Read More
Seed/BiotechDuPont To Build Two Seed Treatment Centers
August 26, 2014
DuPont has announced construction on two state-of-the-art centers dedicated to developing and testing seed treatment formulations, applications and seed handling techniques in an important step toward bringing new solutions to growers. Read More
Seed/BiotechLoveland Products Acquires A Controlling Interest In Ag…
August 26, 2014
Loveland Products, a subsidiary of Agrium , has announced the company has acquired a controlling interest in Agricen, a Dallas-area agricultural biotechnology company delivering biochemical-based products for efficient and sustainable plant nutrition. Read More
StewardshipUp Close Look At The 2014 Environmental Respect Award W…
August 25, 2014
The 2014 Environmental Respect Award winners were honored recently at the 24th annual event in Wilmington, DE. Read More
Eric SfiligojAg Science Rejection Carries Consequences
August 25, 2014
As innuendo and fear dog the regulatory process, agriculture can’t get the new tools it needs to combat world hunger. Read More
LegislationFarmers Dismayed As New Farm Bill Dumps Direct Payments
August 25, 2014
The threatened end of cash subsidies to the nation’s row crop farmers dates back through at least the last two iterations of national agriculture policy legislation. Read More
MAGIE 2014 ShowStopper
EquipmentJohn Deere Again Wins MAGIE ShowStopper Award
August 25, 2014
For the second consecutive year, John Deere was honored at the Midwest AG Industries Exposition (MAGIE) for its new R4045 sprayer. Read More
CropLife 100GROWMARK CEO To Retire
August 22, 2014
GROWMARK chief executive officer Jeff Solberg has announced his retirement effective September 15, 2014. Read More
InsecticidesDuPont’s Prevathon Approved For Dry Beans
August 22, 2014
DuPont Prevathon insect control powered by Rynaxypyr has received EPA registration for foliar use on dry bean crops, including dried shelled peas and beans. Read More
ManagementNCGA DuPont New Leaders Program Enters Sophmore Season
August 20, 2014
The National Corn Growers Association and DuPont are pleased to announce the second year of the NCGA DuPont New Leaders Program. Read More
FungicidesVerdesian Links Up With Mitsui, Hokusan
August 20, 2014
Mitsui Chemicals Agro, Inc., and Hokusan Co., announced the signing of an exclusive licensing agreement allowing Verdesian Life Sciences global access to its patented technology for suppressing mycotoxin contamination in wheat and barley. Read More
SprayersUniversity Of Illinois Introduces New Spray App
August 18, 2014
University of Illinois Extension has released a new smartphone app for making sprayer-related calculations. Pesticide Spray Calculator, or Spray Calc, Read More
Crop InputsSyngenta Names New Manager Of Federal Government Relati…
August 18, 2014
Laura Wood Peterson has joined Syngenta as manager of federal government relations, based in Washington, DC. Read More
ManagementExpert To Discuss Farmland Value, Rent At Farm Science …
August 18, 2014
While cropland values in Ohio increased in the past two years, they have remained flat in 2014, declining in some cases, according to an Ohio State University agricultural economist. Read More