Species composition of ryegrass (Lolium perenne) and tall fescue (Festuca arundinacea) mixtures using various combinations of n-alkanes
| Autor: | Sophie Prache, G. Bechet, Julio Cesar Damasceno, C. Cortes |
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| Rok vydání: | 2005 |
| Předmět: | |
| Zdroj: | Grass and Forage Science. 60:254-261 |
| ISSN: | 1365-2494 0142-5242 |
| DOI: | 10.1111/j.1365-2494.2005.00473.x |
| Popis: | This study was conducted to evaluate the reliability of the n-alkane technique for estimating the species composition of Lolium perenne (ryegrass, L) and Festuca arundinacea (tall fescue, F) mixtures. Samples of L and F were collected in May (period 1) and June 2003 (period 2) on mono-specific swards that were maintained at a height of 9 cm. Seven sets of mixtures containing controlled proportions of L and F were then prepared: 1·00:0, 0·80:0·20, 0·60:0·40, 0·50:0·50, 0·40:0·60, 0·20:0·80 and 0:1·00 of L:F, respectively, in the mixture. The proportion of each species in the mixtures was estimated from measured n-alkane concentrations, and then compared with the actual known proportion. Various n-alkane combinations were tested and compared to establish which combination gave the best estimate. Total n-alkane concentrations, and especially C29- and C31-alkane concentrations, were higher in period 1 than in period 2 for both species. The best n-alkane combination varied between periods, as did the effectiveness of C29-alkane in discriminating between L and F. The species composition of the mixtures was satisfactorily estimated for the majority of n-alkane combinations, providing the combination included n-alkanes with contrasting profiles between both species. A systematic overestimation of the proportion of ryegrass was observed for the 0·50:0·50 mixture. |
| Databáze: | OpenAIRE |
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