Full TGIF Record # 5902
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Author(s):Mislevy, P.; Hodges, E. M.; Martin, F. G.
Author Affiliation:Florida Univ., Gainesville, FL 32611, USA
Title:Hydrocyanic acid potential in stargrass (Cynodon spp.)
Volume Editors:Smith, J. A. and Hays, V.W.
Source:Proceedings of XIV International Grassland Congress. 1983, p. 732-735.
Publishing Information:Boulder, Colorado, USA; Westview Press
Keywords:TIC Keywords: Cynodon dactylon; Cynodon nlemfuensis; Cynodon aethiopicus; Chemical composition; Hydrocyanic acid
Abstract/Contents:Significant differences in HCN potential (HCN-p) in meristematic stem tips were obtained among 9 Cynodon selection over a 2-yr period. The HCN-p conc. basically followed either high or low levels. High-level HCN-p grasses averaged 407 and 529 p.p.m. on a fresh-wt basis during summer and autumn, resp., low-HCN-p grasses averaged 121 and 131 p.p.m. Av. HCN-p conc. were lowest for C. dactylon var. aridus (75 p.p.m.) and highest for C. nlemfuensis var. nlemfuensis (506 p.p.m.). HCN-p content decreased with maturity during summer, but during autumn it remained high until temp. fell below freezing. After frost HCN-p decreased from 92 to 43 p.p.m. and 78 to 25 p.p.m. in high- and low-level grasses, resp. Meristematic tips dried to 85% DM decreased in HCN-p by 88% and 78% for high- and low-level grasses, when compared with fresh samples. Significant correlations were found between HCN-p and total solar radiation. Separating C. nlemfuensis and C. aethiopicus into plant parts showed similar DM levels in both grasses, but HCN-p in C. aethiopicus was consistently lower than that in C. nlemfuensis. The meristematic tips generally had the highest HCN-p regardless of spp. The data indicated differences in HCN-p between Cynodon entries that could be beneficial when managing tropical grasses.
Geographic Terms:Florida
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Mislevy, P., E. M. Hodges, and F. G. Martin. 1983. Hydrocyanic acid potential in stargrass (Cynodon spp.). Int. Grassland Congress Proc. p. 732-735.
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