Weed Management in Semi-arid Regions

A special issue of Plants (ISSN 2223-7747). This special issue belongs to the section "Plant Protection and Biotic Interactions".

Deadline for manuscript submissions: closed (15 December 2021) | Viewed by 3933

Special Issue Editors


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Guest Editor
Columbia Basin Agricultural Research Center (CBARC), Crop and Soil Science Department, Oregon State University (OSU), Adams, OR 97810, USA
Interests: integrated weed management; dryland agriculture; cover crops; intercropping; harvest weed seed control; precision farming; wheat–fallow systems; crop rotations

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Guest Editor
Crop and Soil Science Department, Washington State University, Pullman, WA 99164-6420, USA
Interests: integrated weed management; low external input dryland agriculture; crop competition and yield loss; population genetics; herbicide resistance; weed seedbank management

Special Issue Information

Dear Colleagues,

Herbicide resistance threatens cereal grain production and soil resources around the world by increasing the cost and complexity of weed management and limiting tillage-less systems. Weeds strongly affect the long-term environmental and economic sustainability of dryland semi-arid cropping systems by reducing yields and net financial returns. The use of herbicide alternatives such as crop rotations, cover crops, or intercropping has had limited success in water-limited regions, particularly those with Mediterranean climates. In addition, tillage-less agriculture is slowly being abandoned in semi-arid regions due to herbicide resistance, despite the benefits of soil conservation and improvement of water and fertilizer use efficiency. New tools including harvest weed seed control and precision application technologies have potential to improve weed management in dryland agriculture, but more research is needed before widespread adoption.

In this Special Issue, articles (original research papers, reviews) are welcome that focus on alternative management strategies to herbicides to improve weed control in dryland semi-arid regions.

Dr. Judit Barroso
Dr. Ian Burke
Guest Editors

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Keywords

  • alternative weed management
  • dryland agriculture
  • integrated weed management
  • cover crops
  • new weed control methods
  • precision farming

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Published Papers (1 paper)

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Research

14 pages, 449 KiB  
Article
Herbicide Efficacy of Spot Spraying Systems in Fallow and Postharvest in the Pacific Northwest Dryland Wheat Production Region
by Nicholas G. Genna, Jennifer A. Gourlie and Judit Barroso
Plants 2021, 10(12), 2725; https://doi.org/10.3390/plants10122725 - 11 Dec 2021
Cited by 8 | Viewed by 3250
Abstract
Real-time spot spraying technology has the potential to reduce herbicide costs and slow herbicide resistance. However, few studies exist on the efficacy of this technology in the Pacific Northwest (PNW). This research compared the herbicide efficacy (reduction in weed density and cover) of [...] Read more.
Real-time spot spraying technology has the potential to reduce herbicide costs and slow herbicide resistance. However, few studies exist on the efficacy of this technology in the Pacific Northwest (PNW). This research compared the herbicide efficacy (reduction in weed density and cover) of WEED-IT and WeedSeeker spot spraying systems to uniform spraying in fallow and postharvest in 2019 and 2020. Weed community types included naturally occurring weeds, natural + Russian thistle (Salsola tragus L.), or natural + kochia (Bassia scoparia (L.) A. J. Scott). Herbicides included glyphosate or the pre-mix bromoxynil + pyrasulfotole. Additionally, herbicide efficacy was studied with short stubble (~10 cm), tall stubble (~25 cm), and normal stubble (~20 cm) with chaff and straw removed. In fallow, herbicide efficacy was 1.5 times higher for uniform applications than for WEED-IT or WeedSeeker in 2019 and 2020. Herbicide efficacy was also 1.9 times higher for uniform applications in postharvest in 2019 but no differences were found in 2020. The weed community impacted herbicide efficacy but herbicide efficacy did not differ between residue management treatments. Finally, WEED-IT and WeedSeeker used 53% less herbicide volume in comparison to uniform applications. This research demonstrated that spot spraying technology can be efficacious and economical for growers in the PNW. Full article
(This article belongs to the Special Issue Weed Management in Semi-arid Regions)
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