Controlling herbicide-resistant weeds in soybeans

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

When weeds become resistant to herbicides, the advantage of growing herbicide-resistant crops is lost. Farming practices that limit the emergence of resistant weeds offer another means of control and thwart weeds’ effect on crop production. Finding the right combinations of weed control methods can improve yields and reduce dependence on chemical weed control.

Palmer amaranth is one of the most common—and problematic—weeds in soybean crops across the southern United States. The weed creates a great deal of seed and continues to emerge throughout the growing season. Because it is difficult to control, particularly now that biotypes display resistance to glyphosate, it is best to combat the weed before it emerges.

The journal Weed Technology offers results of field tests of resistant Palmer amaranth in glyphosate-resistant soybean crops in Arkansas conducted over a 2-year period. In this study, 250,000 glyphosate-resistant Palmer amaranth seeds were incorporated into the soil, and their emergence was evaluated five times during the growing season. Three farming practices were tested—deep tillage, planting a cover crop of rye, and double-cropping a field with wheat and then soybeans in the same growing season.

Although no-till planting techniques minimize soil erosion and pesticide runoff, a lack of tillage can lead to an increase in weed seed density at shallow depths. Deep tillage performed once a year in the fall has shown increased crop yields due to better water infiltration and storage. Deep tillage alone produced an 81 percent reduction in Palmer amaranth emergence over the 2 years of this study.

When deep tillage was used in combination with either a cover crop of rye or a first crop of wheat, the results were even better. When a rye crop was planted to compete with weeds, it produced a 98 percent reduction in Palmer amaranth emergence the first year and a 73 percent reduction the second year of the study. Deep tillage and double-cropping soybeans with wheat offered 97 percent and 82 percent reductions in the first and second years, respectively.

Maximizing the amount of plant residue on the soil surface is the key. The high amounts of rye or wheat plant residue left behind helped control the emergence of Palmer amaranth. Deep tillage and double-cropping wheat and soybeans may offer the best weed control value.  The revenue from an additional crop more than offsets additional expenses in farm machinery, fuel, and labor.

Full text of the article, “Influence of Deep Tillage, a Rye Cover Crop, and Various Soybean Production Systems on Palmer Amaranth Emergence in Soybean,” Weed Technology, Vol. 27, No. 2, April-June 2013, is now available


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 

Name
e-Mail (required)
Location

Comment:

characters left


Speed King Honeycomb BeltVeyors

CrustBuster/SPEED KING Inc. has a full line up of Honeycomb style BeltVeyors that offer high capacity, greater discharge height with ... Read More

View all Products in this segment

View All Buyers Guides

Feedback Form
Feedback Form