Picloram (4-amino-3,5,6-trichloro-2-pyridineacarboxylic acid) release from leafy spurge (Euphorbia esula L.) roots was not affected by application rate, root system temperature, or addition of 2,4-D [(2,4-dichlorophenoxy)acetic acid]. Release of 14C from leafy spurge roots was detected 12 hours after 14C-picloram foliar application and increased linearly over a 120-hour period. Over all experiments, 72% of the recovered 14C remained unabsorbed on the treated leaf and 22% remained in the leaves and stems. Less than 7% of the recovered 14C was in the root zone (roots plus nutrient solution), but over 60% of this portion was in the nutrient solution. Adding 2,4-D at rates up to 1.1 kg/ha to 14C-picloram at 0.14 kg/ha did not affect 14C release from leafy spurge roots. The experimentally determined temperature coefficient (Q10) for 14C-picloram release from leafy spurge roots was 1.3+/-0.8. A linear rate of picloram release with time and a Q10 of 1.3 support the hypothesis of passive release of picloram from leafy spurge roots. 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.