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Environment and Spray Additive Effects on Picloram Absorption and Translocation in Leafy Spurge (Euphorbia esula)

Published online by Cambridge University Press:  12 June 2017

Kevin D. Moxness  and
Rodney G. Lym
Kevin D. Moxness
Affiliation:
Crop Weed Sci. Dep. N. D. State Univ., Fargo, ND 58105
Rodney G. Lym
Affiliation:
Crop Weed Sci. Dep. N. D. State Univ., Fargo, ND 58105
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Abstract

Relative humidity after application, spray additives, and solution pH affected both foliar absorption and translocation of 14C-picloram to leafy spurge roots. 14C-picloram absorption increased from 11 to 34% and translocation increased from 5 to 21% as time at posttreatment humidity increased from 0 to 48 h. Absorption and translocation were not different when pre- or posttreatment temperatures were 30/18 or 18/10 C (day/night). 14C-picloram absorption and translocation to the roots were 18 and 6%, respectively, when applied alone, and increased to 46 and 12%, respectively, when applied with ammonium sulfate at 2.5 kg/ha. Absorption and translocation were unaffected by ammonium nitrate. Foliar absorption and translocation of 14C-picloram in leafy spurge were unaffected by pH of unbuffered spray solution but increased at least 50% when applied in a solution buffered at pH 4.8 with trisodium citrate. Foliar absorption in detached leafy spurge leaves increased from 26 to 51% of applied 14C as the citrate buffer concentration increased from 0.01 to 0.1 mM, respectively.

Keywords

Picloram, 4-amino-3,5,6-trichloro-2-pyridinecarboxylic acidammonium nitrate, NH4NO3ammonium sulfate, (NH4)2SO4trisodium citrate, Na3C6H5O7·2 H2Oleafy spurge, Euphorbia esula L. ♯3 EPHESAbsorption and translocationspray solutionpHfertilizer additiveEPHES
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 37 , Issue 2 , March 1989 , pp. 181 - 186
Copyright
Copyright © 1989 by the Weed Science Society of America 

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