Research observation: Nitrogen effects on Arizona cotton-top and Lehmann lovegrass seedlings

Maria E. Fernandez-Giménez, Steven E. Smith

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

We compared the responses of seedlings of introduced Lehmann lovegrass (Eragrostis Lehmanniana Nees) and a native perennial grass, Arizona cottontop (Digitaria californica (Benth.) Henr.) to 7 nitrogen and 2 water treatments to determine if Lehmann lovegrass displayed greater growth or nitrogen use efficiency than Arizona cottontop. After 8 weeks, the lovegrass seedlings had greater shoot N concentrations (2.07 vs. 1.20%), and lower C:N ratios (27.7 vs. 49.6) than Arizona cottontop seedlings. Arizona cottontop seedlings produced more biomass per plant (1.09 vs. 0.31g), exhibited greater nitrogen use efficiency (63 vs. 39%), and tolerated high N levels better. Arizona cottontop may be a superior N competitor under both N-limited and high N conditions, while Lehmann lovegrass may outcompete Arizona cottontop at moderate N levels.

Original languageEnglish (US)
Pages (from-to)76-81
Number of pages6
JournalJournal of Range Management
Volume57
Issue number1
StatePublished - Jan 1 2004

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Keywords

  • Desert grassland
  • Invasive plant
  • Nitrogen dynamics
  • Nitrogen use efficiency
  • Plant strategies

ASJC Scopus subject areas

  • Ecology
  • Animal Science and Zoology

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