By Scout Nelson
Researchers at the University of Nebraska-Lincoln (UNL) are evaluating new strategies to manage herbicide-resistant Palmer amaranth, a major weed challenge in soybean production. Their research focuses on how residual herbicide applications and soybean row spacing can work together to improve season-long weed control.
The study is led by Amit Jhala, Nebraska Extension weed management specialist, and Ankit Yadav, a doctoral student at UNL. They are investigating whether residual herbicides applied before and after soybean emergence can reduce Palmer amaranth populations and limit late-season weed escapes.
Palmer amaranth is a significant concern for soybean growers due to its herbicide resistance and ability to produce large amounts of seed. Effective control is critical for protecting yields and reducing future weed pressure.
Researchers are comparing 15-inch and 30-inch soybean row spacing to determine how canopy development influences weed suppression. Narrower rows may help reduce weed growth by limiting sunlight reaching the soil surface.
The project also evaluates overlapping residual herbicide programs, which involve multiple herbicide applications throughout crop development. This approach may provide longer-lasting control and reduce the number of surviving weeds later in the season.
According to the researchers, combining row spacing strategies with effective herbicide programs could provide growers with a more comprehensive weed management system. Reducing late-season Palmer amaranth escapes is especially important for limiting seed production and future infestations.
The findings are being shared through N Field Observations, helping Nebraska producers gain practical insights into integrated weed management practices. The research reflects UNL's ongoing efforts to develop science-based solutions for modern crop production challenges.
Photo Credit: istock-oticki
Categories: Nebraska, Crops, Soybeans