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ARS Home » Midwest Area » Urbana, Illinois » Global Change and Photosynthesis Research » Research » Research Project #434630

Research Project: Managing Cover Crop-Herbicide Interactions to Improve Herbicide Efficacy

Location: Global Change and Photosynthesis Research

Project Number: 5012-12220-009-58-I
Project Type: Interagency Reimbursable Agreement

Start Date: Apr 1, 2018
End Date: Mar 31, 2021

Objective:
Objective 1: Quantify synergistic impact of rye residues and herbicides on weed seedling growth and survival under controlled environment and field conditions. Objective 2: Elucidate physiological impact of rye residues on herbicide metabolism of weed seedlings.

Approach:
We will conduct controlled environment and field studies of the independent and combined effects of soil incorporated rye residues and S-metolachlor on the growth and survival of Amaranthus retroflexus and Amaranthus tuberculatus seedlings. Within greenhouse studies only, we will quantify the dose response of Amaranthus spp. mortality to S-metolachlor in soils with and without rye amendment. Finally, we will use standard herbicide metabolism laboratory procedures to determine whether shifts in S-metolachlor dose response of Amaranthus seedlings is due to altered detoxification, altered translocation or another mechanism.