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Lehmann Lovegrass Live Component Biomass and Chemical Composition

Jerry R. Cox
Journal of Range Management
Vol. 45, No. 6 (Nov., 1992), pp. 523-527
DOI: 10.2307/4002564
Stable URL: http://www.jstor.org/stable/4002564
Page Count: 5
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Lehmann Lovegrass Live Component Biomass and Chemical Composition
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Abstract

Lehmann lovegrass (Eragrostis lehmanniana Nees), a perennial bunchgrass from southern Africa, is replacing native grasses in Arizona. After the invasion, biomass production and quality may change. This study was conducted to determine the production and chemical composition of live Lehmann lovegrass leaves, culms, and seedheads during wet and dry years. During 3 years, green leaf biomass peaked at $78\pm 14\ {\rm g}\ {\rm m}^{-2}$ (X̄ ± SE) in early August, green culms peaked at $103\pm 21\ {\rm g}\ {\rm m}^{-2}$ in mid October, and green seedheads peaked at $18\pm 12\ {\rm g}\ {\rm m}^{-2}$ in mid August. Leaf and culm growth peaks correspond with low crude protein (2.5%) and moderate phosphorus (0.23-0.25%) levels while seedhead growth peaks correspond with high crude protein (7-10%) and moderate phosphorus (0.19-0.29%) levels. There were no crude protein and phosphorus peaks in green culms. In Lehmann lovegrass forage, crude protein should meet animal requirements for about half the year while phosphorus should be adequate throughout the year. In native forages, crude protein is adequate throughout the year because animals selectively graze forbs, grasses, and shrubs but phosphorus does not meet animal requirements except in midsummer.

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