Diversidad y uso de arvenses en pasturas de fincas ganaderas del Alto Magdalena (Tolima, Colombia)

this study was aimed to identify and recognize the main uses of weeds in pastures of livestock farm located in the high watershed of magdalena river, department of tolima (colombia), where 8 farms were analyzed. the farms were located in six municipalities of tolima: ibagué, piedras, armero, guamo, alvarado and suárez, under a dry tropical forest zone (bs-t) and pre-wet forest (bh-pm). the fieldwork was conducted during 5 months on rainy season and 4 months on dry season of 2007. we evaluated 2 transects with 10 sampling sites distributed over 100 m of each transect, using a one meter square for sampling. the samples collected were identified at the toli herbarium. we found 113 species belonging to 30 families and 82 genera, were the predominant families fabaceae with 24 species (20,5%) and asteraceae with 20 species (17,1%). the most abundant species throughout the area were senna obtusifolia and achyranthes indica. found 22 species (18,8%) are of interest beekeeping; 20 species (17,1%) have some medical use, 12 species (10,3%) are conservative and 11 species of soil (9,4%) are used especially in food summer where forage is scarce