Little research has been reported on nitrogen fixation of annual medics such as black medic (Medicago lupulina), barrel medic (M. truncatula) var. Jemalong, and California burclover (M. polymorpha). A greenhouse study was initiated with these 3 medic species to estimate their nitrogen fixation potentials. Considerable variations existed for all indices used to evaluate nitrogen fixation. Barrel medic, var. Jemalong, produced moderate acetylene reduction rates and had the highest top growth weights. This variety also maintained the greatest plant vigor throughout the observation period. High top growth weight, root fresh weight, nodule count, and root score were all associated with high acetylene reduction rates. Plant vigor and color scores were less associated with acetylene reduction rates. Assuming acetylene reduction is a true measure of nitrogen fixation, this experiment indicates the annual medics fix significant amounts of nitrogen. This material was digitized as part of a cooperative project between the Society for Range Management and the University of Arizona Libraries. The Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information. Migrated from OJS platform August 2020
Scholarly peer-reviewed articles published by the Society for Range Management. Access articles on a rolling-window basis from vol. 1, 1948 up to 5 years from the current year. Formerly Journal of Range Management (JRM). More recent content is available by subscription from SRM.