Recipient Organization
OREGON STATE UNIVERSITY
(N/A)
CORVALLIS,OR 97331
Performing Department
(N/A)
Non Technical Summary
The long-term profitability of organic vegetable production in the Pacific Northwest depends on reduced tillage systems, which in turn require effective weed management tools. These tools must reduce reliance on hand labor, preserve soil fertility, and keep American growers profitable. Electric weed control (EWC) is a non-chemical method that uses high-voltage electricity to damage plant tissues without disturbing the soil, offering strong potential for controlling weeds that are difficult to manage with current organic methods. Research has shown that EWC can effectively control both annual and perennial weeds and may be less dependent on weather conditions than flame weeding, steaming, or organic herbicides. The long-term goal of this project is to determine the suitability of EWC as a practical, economically viable, and environmentally compatible weed management strategy for organic vegetable systems. The objectives are to: (1) evaluate approaches for integrating EWC into no-till and minimal-till organic vegetable systems, (2) optimize inter-row EWC strategies in commercial fields and measure impacts on labor and profitability, (3) determine the effectiveness of EWC for terminating cover crops, and (4) conduct extension and educational activities to share results and gather feedback from growers.This research and extension program addresses pressing challenges in American agriculture, safeguards food production as a matter of national security, and advances agricultural innovation to keep American farmers at the forefront of productivity. The project will provide tested and proven guidance for incorporating EWC into organic vegetable production, supporting improved weed management, reduced soil disturbance, decreased hand-weeding needs, and enhanced American farm profitability.
Animal Health Component
80%
Research Effort Categories
Basic
20%
Applied
80%
Developmental
0%
Goals / Objectives
The overarching goal of this project is to develop and demonstrate practical, effective, and economically viable strategies for integrating electric weed control (EWC) into no-till and minimal-till organic vegetable production systems in the Pacific Northwest. This cross-functional research and extension effort will (1) evaluate methods for incorporating EWC into organic vegetable systems, (2) assess its performance for managing weeds between planting rows in commercial fields, (3) determine its effectiveness for terminating cover crops, and (4) provide outreach opportunities, including field demonstrations, workshops, and grower meetings, to enable organic vegetable producers to observe EWC in practice, engage with the research team, and share experiences with peers. Collectively, these objectives aim to equip American growers with the knowledge to make informed decisions about adopting new weed control technology in organic vegetables.
Project Methods
Objective 1: Incorporate EWC into minimum-till organic vegetable systemsField experiments in organic fields will compare conventional tillage with preplant and postemergence applications of EWC, flaming, and organic herbicides, alone and in combination. Snap beans and sweet corn will be grown in rotation. Treatments will be applied before planting and again three weeks later. EWC will be applied with a commercial EH30 Thor unit, including an inter-row applicator for postemergence passes. Data will include baseline and post-treatment soil health (aggregate stability, water holding capacity, soil C, protein, respiration, and chemical indicators), species-level weed control at 7, 14, and 21 days after treatment, weed cover/count, above-ground weed biomass, crop injury, plant height, stand count, and yield. Experimental design will be split-plot with crop and initial treatment as factors; mixed models will analyze treatment effects.Objective 2: Optimize inter-row EWC strategies in commercial fieldsInitial trials will evaluate EWC travel speed (1-8 km h?¹) and cultivation timing (7 days before, same day, or 7 days after EWC) in a factorial design. Follow-up on-farm trials will test grower standard cultivation and EWC at two travel speeds, alone and in combination with cultivation, in vegetable crops with varied row spacing. Treatments will be applied twice, three weeks apart. Weed control will be assessed by species at 7, 14, and 21 days after each application, with separate inter-row and in-row measurements. Above-ground weed biomass, crop injury, height, stand count, and yield will be recorded. Hand-weeding time will be measured to estimate labor savings. Economic analysis will include fuel/energy use, costs, and net returns, with results presented as grower case studies. Data will be analyzed using RCBD with mixed models; means will be separated with Tukey's test and planned contrasts.Objective 3: Evaluate EWC for cover-crop termination in organic vegetable productionField trials will include four cover crops (oat, vetch, phacelia, and a mix) plus a no-cover control, terminated by (a) tillage, (b) EWC at 1 km h?¹ (two passes), or (c) mowing plus EWC. Snap beans will be planted after termination under uniform fertility management. Data will include cover-crop biomass, pre- and post-termination weed density and species composition, bean emergence, yield, and biomass, soil health indicators, leaf tissue nutrients, and soil moisture. Weed control will be assessed monthly by species and cover. A split-plot design will be used with termination method as main plots and cover crop species as subplots; mixed models will assess effects and interactions.Objective 4: Extension and outreachField days, on-farm demonstrations, and conference presentations will showcase EWC performance and research findings. An advisory board of growers, crop advisors, and industry representatives will meet three times annually to guide research priorities and review progress. Online outreach will include a project webpage, instructional videos on EWC setup and operation, and extension publications. On-farm trials will be developed into studies detailing production, economics, and grower experiences. Short learning evaluations will be conducted at in-person events, with follow-up surveys to assess medium-term adoption of EWC practices. Local surveys will track adoption of alternative weed management practices over time.