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    • Journal of Range Management, Volume 46 (1993)
    • Journal of Range Management, Volume 46, Number 5 (September 1993)
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    Dinitrogen fixation and transfer in legume-crested wheatgrass mixtures

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    Author
    Gebhart, D. L.
    Call, C. A.
    Weaver, R. W.
    Issue Date
    1993-09-01
    Keywords
    melilotus alba
    nitrogen fixation
    Medicago sativa
    biogeochemical cycles
    Agropyron desertorum
    Agropyron cristatum
    
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    Citation
    Gebhart, D. L., Call, C. A., & Weaver, R. W. (1993). Dinitrogen fixation and transfer in legume-crested wheatgrass mixtures. Journal of Range Management, 46(5), 431-435.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644535
    DOI
    10.2307/4002662
    Additional Links
    https://rangelands.org/
    Abstract
    Crested wheatgrasses [Agropyron cristatum L. Gaertn. and A. desertorum Fisch. ex (Link) Schult.] have been extensively seeded on semiarid western rangelands, but without supplemental N many of these seedings decline in vigor, ground cover, and productivity as the stand ages. Biological N2 fixation by legumes may represent a viable alternative to fertilizer N for increasing stand productivity. Two growth-room studies were designed to investigate N2 fixation and N transfer in mixtures of alfalfa (Medicago sativa L.) or annual sweetclover (Melilotus alba Medik. var. annua Coe) and crested wheatgrass. Growth media were enriched with 15N-labeled KNO3 at a rate of 24.2 kg N ha-1 and used to grow mixtures and monocultures of alfalfa or sweetclover and crested wheatgrass. Fixed and transferred N were determined at 3 harvest dates from differences in isotopic composition between the legume species in mixture with crested wheatgrass and crested wheatgrass in monoculture. The percentage of legume N derived from fixation was >80% for the final 2 harvests and increased as the proportion of crested wheatgrass in the mixtures increased. Nitrogen transfer from alfalfa to crested wheatgrass accounted for < 5 % of the grass total N. Conversely, nitrogen transfer from sweetclover to crested wheatgrass accounted for about 20% of the grass total N. Nitrogen transfer from alfalfa or sweetclover to crested wheatgrass may be important in maintaining stand productivity on N-limited western rangelands.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4002662
    Scopus Count
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    Journal of Range Management, Volume 46, Number 5 (September 1993)

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