Enhancement of Grassland Function and Productivity with Legumes and Other Forbs—2nd Edition

A special issue of Agronomy (ISSN 2073-4395). This special issue belongs to the section "Grassland and Pasture Science".

Deadline for manuscript submissions: 30 June 2025 | Viewed by 1018

Special Issue Editors


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Guest Editor
Department of Plants, Soils & Climate, Utah State University, 4820 Old Main Hill, Logan, UT 84322, USA
Interests: forage production; irrigated pasture management; forage physiology; forage management; ruminant production
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Guest Editor
School of Plant and Environmental Sciences, Virginia Tech, Blacksburg, VA 24061, USA
Interests: plant production systems; forage and crop ecology
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Special Issue Information

Dear Colleagues,

While legumes and other forbs are not the dominant functional groups in grasslands, their value is far-reaching. From alpine to desert environments, forb species provide essential biological diversity to native grasslands, and seeded broadleaf ley and cover crops increase the organic matter and nutrient status of their soil. Legumes contribute nitrogen to grasslands through biological fixation, and the belowground rooting structure of grasslands is broadened by tap-rooted forbs. Many forbs synthesize bioactive chemicals, such as tannins, essential oils, and isoflavones, that benefit the health and productivity of ruminants while reducing their negative environmental impacts, including methane emissions and nitrogen losses.

We previously published a Special Issue on “Enhancement of Grassland Function and Productivity with Legumes and Other Forbs”, which contained several excellent papers. Based on the success of that Special Issue, we now propose a second edition of the same topic that will cover a broader range of forb applications.

This Special Issue of Agronomy is focused on the enrichment that forbs introduce to grasslands around the globe. Current research on grassland forbs includes the provision of floral resources for pollinators, the differential delivery of soil nutrients provided by grasses and forbs, and the positive effect of legumes on soil carbon sequestration. We invite reports of original research and reviews on all aspects of the contributions that forbs make to grasslands and the implications for ruminants, wildlife and pollinator habitats, soil microbiology, and the sustainability and resilience of grasslands in changing climates.

Prof. Dr. Jennifer MacAdam
Dr. Benjamin F. Tracy
Guest Editors

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Keywords

  • pollinator habitat
  • plant secondary metabolites
  • soil carbon sequestration
  • grassland functional groups
  • cover crops
  • ley pastures
  • biological nitrogen fixation
  • wildflowers
  • native grasses

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Published Papers (1 paper)

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Research

23 pages, 4030 KiB  
Article
Weed Incursion of Irrigated Forage–Forb Mixtures Under Mob Grazing or Mowing in the Mountain West USA
by Jennifer MacAdam, Jared Gibbons and Xin Dai
Agronomy 2025, 15(1), 25; https://doi.org/10.3390/agronomy15010025 - 26 Dec 2024
Viewed by 776
Abstract
Improving the quality of irrigated pastures can increase the profitability of ruminant production systems. Increasing pasture plant biodiversity is beneficial for ruminants, pollinators, and soil health, but it is challenging to manage weed incursion in seeded mixed-species pastures. This study assessed the weed [...] Read more.
Improving the quality of irrigated pastures can increase the profitability of ruminant production systems. Increasing pasture plant biodiversity is beneficial for ruminants, pollinators, and soil health, but it is challenging to manage weed incursion in seeded mixed-species pastures. This study assessed the weed incursion that resulted when forage legumes or grasses were seeded as binary mixtures with one of four non-legume forbs. Defoliation occurred at 6-week intervals as either mowing or mob grazing. Forbs were chicory, plantain, Lewis flax, or small burnet and forages were alfalfa, birdsfoot trefoil, creeping foxtail, intermediate wheatgrass, kura clover, meadow bromegrass, orchardgrass, perennial ryegrass, reed canarygrass, sainfoin, smooth bromegrass, tall fescue, and white clover. Four defoliations per year occurred between May and September for two years. Eight replications were grouped into four blocks and each pair in a block was randomly assigned to the two defoliation treatments, mob grazing or mowing. Plots were 1.5 m2 and were assessed visually before each defoliation for the percentage of forage, forb, and weed. Chicory was the most dominant of the four forbs, and relative to legumes, most grasses suppressed both forb establishment and weed incursion under both grazing and mowing. There were no statistically significant effects of defoliation treatment on weed incursion. Full article
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