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Effect of pH on Foliar Uptake of 2,4,5-T-1-14C

Published online by Cambridge University Press:  12 June 2017

J. R. Baur ,
R. W. Bovey  and
Imogene Riley
J. R. Baur
Affiliation:
Agr. Res. Serv., U.S. Dep. Agr., Dep. of Range Sci., Texas A&M Univ., College Station, TX 77843
R. W. Bovey
Affiliation:
Agr. Res. Serv., U.S. Dep. Agr., Dep. of Range Sci., Texas A&M Univ., College Station, TX 77843
Imogene Riley
Affiliation:
Agr. Res. Serv., U.S. Dep. Agr., Dep. of Range Sci., Texas A&M Univ., College Station, TX 77843
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Abstract

Uptake of 2,4,5-T-1-14C [(2,4,5-trichlorophenoxy)-acetic acid] by immersion of honey mesquite [Prosopis juliflora (Swartz) DC var. glandulosa (Torr.) Cockerell] leaflets rapidly diminished as pH was increased from 3.5 to 9.5. Uptake diminished less rapidly as pH increased when 10-μl droplets were applied to leaflets that were kept moist. Uptake was equivalent from solutions of pH 3.5, 5.5, and 7.5; but severely reduced at pH 9.5, when leaflets were droplet treated and let dry. Uptake under dry conditions from pH 7.5 and 9.5 droplets containing 1 M NH4Cl was equivalent to uptake from pH 3.5 and 5.5 droplets lacking NH4Cl. NH4Cl had no enhancing effect on uptake at any pH when leaflets were immersed or droplet-treated and maintained moist. Low concentrations of urea had no enhancing effect on uptake at pH 9.5 by droplet-treated leaflets that were allowed to dry. Urea concentrations above 0.1 M inhibited uptake.

Type
Research Article
Information
Weed Science , Volume 22 , Issue 5 , September 1974 , pp. 481 - 486
Copyright
Copyright © 1974 by the Weed Science Society of America 

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