2021
Effects of Planting Green on Residual Herbicide Performance, Soil Health, and Management of Glyphosate-Resistant Palmer Amaranth in Soybean
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Contributor/Checkoff:
Nebraska Soybean Board
Category:
Sustainable Production
Keywords:
Field management Nutrient managementSoil healthTillageYield trials
Parent Project:
This is the first year of this project.
Lead Principal Investigator:
Amit Jhala, University of Nebraska at Lincoln
Co-Principal Investigators:
Project Code:
702
Contributing Organization (Checkoff):
Nebraska Soybean Board
$53,541
Institution Funded:
University of Nebraska at Lincoln
$53,541
Brief Project Summary:

Planting green refers to no-till planting of the primary crop into actively growing cover crop. Cereal rye is the most commonly planted cover crop in corn/soybean cropping systems in Nebraska. Use of pre-emergence residual herbicide with multiple sites of action is one of the first recommendations for control of glyphosate-resistant Palmer amaranth. Additionally, to be effective, pre-emergence herbicide must be placed in contact with the soil and an even layer of the chemical is required to intercept germinating weed seeds. When pre-emergence herbicides are applied on standing cereal rye, it may affect the performance of the residual herbicides. Therefore, research is needed to determine...

Unique Keywords:
#crop management systems
Information And Results
Project Deliverables

Field experiments will be conducted in a grower’s field infested with glyphosate-resistant Palmer amaranth near Carleton in Thayer County, Nebraska. Treatments will be arranged in a randomized complete block design (RCBD) with an augmented 2 x 12 factorial treatment arrangement with four replications. The augmented factorial treatment arrangement will include cereal rye termination timing (2 weeks before and after planting soybean) and 12 treatments, including three pre-emergence herbicides (Authority Supreme, Fierce MTZ, and Zidua PRO), post-emergence herbicides (Roundup PowerMax, XtendiMax), and a non-treated control, a weed-free control but cereal rye present, and a weed free and cereal rye free control. Palmer amaranth control, density and biomass will be measured and effect on soil health, yield, and cost-benefit ratio of each treatment will be calculated. An extension field day will be organized at the research site to demonstrate the results of the project to soybean growers and results will be presented during extension meetings and will be published in Crop Watch and NebGuide.

Final Project Results

Updated May 19, 2023:

View uploaded report PDF file

Termination of cereal rye after 2 weeks of planting soybean suppressed weeds including Palmer amaranth and waterhemp better than terminating cereal rye 2 weeks before planting. This would be a good non-chemical tool to include in the toolbox for the effective management of herbicide-resistant weeds in soybean.

The United Soybean Research Retention policy will display final reports with the project once completed but working files will be purged after three years. And financial information after seven years. All pertinent information is in the final report or if you want more information, please contact the project lead at your state soybean organization or principal investigator listed on the project.