Row space, pre herbicides reduce early-season weeds

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

What do weeds want? They want their space.

Weeds aggressively fight for water, light and nutrients, crowding crops. But growers can prevent weeds from taking up precious space by planting narrower rows and using a preemergence herbicide program.

Weeds begin robbing yield early in the growing season, according to a study from the University of Nebraska.1 The study found that weeds can begin causing yield loss as early as the V1 growth stage in soybeans planted in 30-inch rows. Yield loss started in the V2 stage in 15-inch rows and at the V3 and V4 stages in narrower rows of 7.5 inches. The study confirmed that row spacing and the timing of weed control significantly influenced weed growth.

Combining the use of narrowly planted rows with a preemergence herbicide program can greatly reduce early season competition and give soybeans a clean start, said Joe Armstrong, field scientist, Dow AgroSciences.

“Once growers lose crop yield to weed competition, it can’t be recovered, even if the crop is kept weed-free for the rest of the season,” Armstrong said. “Timing is everything, and because weeds rob yield so early in the growing season, using a preemergence herbicide to reduce competition is that much more important.”

If a grower uses an effective preemergence herbicide, it delays the starting point for weeds, giving crops the full use of moisture, sunlight and nutrients, said Armstrong.

“If soybeans get the right amount of nutrients and moisture in the beginning because they aren’t competing with weeds, they can get that much closer to canopy closure before the preemergence herbicide wears out and weeds start to emerge,” Armstrong said. “When the canopy closes, it blocks sunlight from reaching the soil, impeding weed growth.”

Sonic herbicide and Surveil co-pack herbicide feature multiple modes of action that offer the residual control necessary to curb early-season weed competition in soybean fields. Armstrong said, “Reducing competition early can lower growers’ stress levels later in the season.”

1Knezevic, S.Z., S.P. Evans, and M. Mainz. 2003. Row Spacing Influences the Critical Timing for Weed Removal in Soybean. University of Nebraska. Weed Technology. 17:666-673.

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 

e-Mail (required)


characters left


Made of high quality 304 stainless steel, the Quickveyor is one of the strongest trailers on the market. It’s belt ... Read More

View all Products in this segment

View All Buyers Guides

Feedback Form
Feedback Form