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

CropLife 100Agrium To Cut 500 Jobs, Sell Some Businesses
November 11, 2014
Among the businesses Agrium will try to sell are its micronutrients and European UAN (urea-ammonium nitrate) lines. Read More
HerbicidesMonsanto, Sumitomo Chemical And Valent Extend Crop Protection Collaboration
November 10, 2014
The agreement extends their strategic partnership in Monsanto’s Roundup Ready PLUS Crop Management Solutions platform for soybeans and cotton in the U.S. Read More
FertilizerCorn Rootworm Hybrids And Potassium Uptake
November 4, 2014
To achieve successful yields, grower-customers can’t afford to cut back on their potassium use with corn rootworm hybrids, say experts. Read More
StewardshipResponsibleAg Begins Auditor Training
October 31, 2014
ResponsibleAg auditor training is now underway at the Ford B. West Center for Responsible Agriculture in Owensboro, KY. Read More
InsecticidesNew Research Study Shows The Value Of Neonics
October 29, 2014
The study evaluated seed treatment, soil and foliar uses of neonicotinoid insecticides in the U.S. and Canada. Read More
Crop InputsPlatform Specialty Products To Acquire Arysta LifeScience
October 20, 2014
Once the acquisition is complete, Platform Specialty Products will combine Arysta LifeScience with previously acquired companies Agriphar and Chemtura Crop Solutions. Read More

Latest News

Eric SfiligojGiving Thanks For Another Great Year
November 24, 2014
As Thanksgiving Day 2014 arrives, agriculture has plenty to be thankful for. Read More
Crop InputsSyngenta Cost-Cutting Program To Affect 1,800 Jobs
November 24, 2014
The company's Accelerating Operational Leverage program will result in job reductions and relocations totaling around 1,800 across the company, the majority of which will occur in 2015. Read More
EquipmentAGCO Announces Operator Of The Year Finalists
November 20, 2014
Four custom applicators have been selected by AGCO Application Equipment as finalists for 2014 Operator of the Year, an honor that recognizes them as being among the top professionals in their industry throughout North America. Read More
MicronutrientsH.J. Baker Expands Tiger-Sul Business
November 20, 2014
H.J. Baker has created and filled two strategic positions in business development and sales within its Crop Performance Division. Read More
soybean field
FertilizerGeneral Mills Honors United Suppliers For Nitrogen Opti…
November 19, 2014
United Suppliers winning proposal detailed SUSTAIN, a consulting network that provides customized products and services for farmers using a needs-based system approach. Read More
EmployeesOhio AgriBusiness Association Awards $25,000 In Scholar…
November 19, 2014
Each year, the Ohio AgriBusiness Association Educational Trust scholarship program awards scholarship dollars to students enrolled in an agriculture-related field attending several state colleges. Read More
ManagementServi-Tech Names New CEO
November 17, 2014
Servi-Tech has named Greg Ruehle its new president and CEO. Read More
CropLife 100Pinnacle Ag Acquires Colorado Aerial Application Outlet
November 17, 2014
Ft. Lupton, CO-based Reck Aviation — a full-service chemical application company providing aerial crop applications of fertilizers and crop protection products — will operate as part of Pinnacle's AgOne Application Services brand. Read More
Eric SfiligojMcDonald’s Message: Biotech Crops Scarier Than Cancer
November 17, 2014
Despite their potential health benefits, one of the world’s largest potato users will pass on a new biotech offering. Read More
MicronutrientsWinField Releases 2014 NutriSolutions Results
November 14, 2014
A number of significant regional and national crop deficiency trends emerged from the 2014 WinField NutriSolutions tissue sampling program. Read More
FertilizerH.J. Baker Opens Chinese Production Lines
November 14, 2014
The occasion was the official launch of the Tiger-Sul sulphur Bentonite production line of two much anticipated fertilizer products in China, T90CR sulphur fertilizer and TZinc micronutrient enhanced sulphur fertilizer. Read More
ManagementOhio Certified Crop Adviser Program Accepting Nominatio…
November 14, 2014
The award recognizes an individual who delivers exceptional customer service for farmer clients in nutrient management, soil and water management, integrated pest management and crop production in Ohio. Read More
HerbicidesSyngenta Announces Acuron Trial Plot Results
November 14, 2014
Acuron was tested at 167 trial locations across 35 states. Trials included 95 Syngenta locations, 54 university locations and 18 distributor locations. Read More
Crop InputsVerdesian Expands Sales Force
November 13, 2014
The new sales representatives will work with growers, retail partners and distributors to oversee technical training and product education. Read More
EquipmentAGCO Raises $100K For Wounded Warrior Project
November 13, 2014
AGCO Corp. partnered with local AGCO dealers across the U.S. and Canada to raise nearly $100,000 in support of wounded service veterans. Read More
HerbicidesDow AgroSciences Announces Launch Of Enlist Duo Herbici…
November 12, 2014
It will be launched in conjunction with a stewarded introduction of Enlist corn, and seed production of Enlist soybeans in 2015. Read More
FertilizerH.J. Baker Expands Tiger-Sul Business
November 12, 2014
Agricultural firm H.J. Baker has created and filled two strategic positions in business development and sales within its Crop Performance Division. Read More
Blenders13 Fertilizer Blenders For 2015
November 12, 2014
Dealers can find a fertilizer blender to deliver any speed, volume and custom mix they want. Read More