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Research ArticleREFEREED RESEARCH

Dryland seedling emergence of basalt milkvetch (Astragalus filipes) and western prairie clover (Dalea ornata) under different planting seasons and seed treatments

B Shaun Bushman, Matthew E Horning, Clinton C Shock, Erik BG Feibert and Douglas A Johnson
Native Plants Journal September 2019, 20 (3) 239-243; DOI: https://doi.org/10.3368/npj.20.3.239
B Shaun Bushman
, Research Plant Geneticist, USDA ARS Forage and Range Research Laboratory, 700 North 1100 East Logan, UT 84322-6300,
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  • For correspondence: [email protected]
Matthew E Horning
, Plant Geneticist, USDA Forest Service, Deschutes National Forest, 63095 Deschutes Market Road Bend, OR 97701
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Clinton C Shock
, Professor Emeritus, Oregon State University Malheur Experiment Station, 595 Onion Avenue, Ontario, OR 97914
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Erik BG Feibert
, Senior Faculty Research Assistant, Oregon State University Malheur Experiment Station, 595 Onion Avenue, Ontario, OR 97914
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Douglas A Johnson
, Plant Physiologist, USDA ARS Forage and Range Research Laboratory, 700 North 1100 East Logan, UT 84322-6300
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Abstract

Basalt milkvetch and western prairie clover are native perennial legumes distributed in the northern Great Basin and Columbia River Plateau of North America, with recent germplasm releases providing seed for revegetation. Although seed germination studies have identified scarification requirements for both species, and additional cold stratification for Astragalus filipes, no research has been conducted to optimize the likelihood of seedling emergence on rangeland sites. In this study, we planted both species in 3 locations in the northern Great Basin over 3 y. Seeds were planted in both fall and spring seasons, with emergence measured each June. For both species, there was variation in seedling emergence success across locations and years, with the Powell Butte, Oregon, location providing the highest emergence and the 2011–2012 winter season leading to the highest emergence. For A. filipes, the greatest seedling emergence occurred with fall plantings with scarified seed because of a need for cold stratification and a slow germination rate. For Dalea ornata, because of its hard seedcoat yet rapid germination, the greatest seedling emergence occurred with spring plantings with scarified seed. Our data indicate a need for scarifying seed for both species, but planting A. filipes in fall and planting D. ornata in spring.

  • native legume
  • seed scarification
  • revegetation
  • seedling establishment
  • Fabaceae
NOMENCLATURE
  • USDA NRCS 2018
  • © 2019 by the Board of Regents of the University of Wisconsin System

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Native Plants Journal: 20 (3)
Native Plants Journal
Vol. 20, Issue 3
21 Sep 2019
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Dryland seedling emergence of basalt milkvetch (Astragalus filipes) and western prairie clover (Dalea ornata) under different planting seasons and seed treatments
B Shaun Bushman, Matthew E Horning, Clinton C Shock, Erik BG Feibert, Douglas A Johnson
Native Plants Journal Sep 2019, 20 (3) 239-243; DOI: 10.3368/npj.20.3.239

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Dryland seedling emergence of basalt milkvetch (Astragalus filipes) and western prairie clover (Dalea ornata) under different planting seasons and seed treatments
B Shaun Bushman, Matthew E Horning, Clinton C Shock, Erik BG Feibert, Douglas A Johnson
Native Plants Journal Sep 2019, 20 (3) 239-243; DOI: 10.3368/npj.20.3.239
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Keywords

  • native legume
  • seed scarification
  • revegetation
  • seedling establishment
  • Fabaceae
  • USDA NRCS 2018
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