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CGA-362622: Soil Behavior and Foliar Versus Root Absorption by Torpedograss (Panicum repens)

Published online by Cambridge University Press:  20 January 2017

Walker Williams ,
Glenn Wehtje  and
Robert H. Walker
Walker Williams
Affiliation:
Department of Agronomy and Soils, Auburn University, AL 36849-5412
Glenn Wehtje
Affiliation:
Department of Agronomy and Soils, Auburn University, AL 36849-5412
Robert H. Walker*
Affiliation:
Department of Agronomy and Soils, Auburn University, AL 36849-5412
*
Corresponding author's E-mail: rwalker@acesag.auburn.edu
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Abstract

Selective placement studies were conducted under greenhouse conditions to determine the relative importance of root vs. foliar absorption of postemergence-applied CGA-362622 by torpedograss. All application methods were equally effective in reducing torpedograss foliage as measured 4 wk after treatment. However, foliar + soil and soil-only were more effective than foliar-only in suppressing regrowth at 10 wk after treatment. Foliar absorption by torpedograss and subsequent translocation was determined with radiotracer techniques. After 72 h, 29% of the applied CGA-362622 had been absorbed, and 2 and 7% of the amount applied had accumulated in developing rhizomes and roots, respectively. CGA-362622 was more readily absorbed and translocated by the root. Hydroponically grown plants were transferred to a hydroponic solution spiked with CGA-362622 at 200 ppb. After 6 h, whole plant concentration was 113.1 ng/plant. Only 56% of amount absorbed remained in the roots, the remainder having been translocated to other tissues. The youngest leaf and the immature rhizomes accumulated 2 and 15%, respectively. CGA-362622 soil adsorption was slightly influenced by CGA-362622 concentration and greatly influenced by soil pH. Average percent recovered in the soil solution (i.e., not absorbed) was 15.3 and 27.4% at pH 5.7 and 6.7, respectively. Soil mobility was also pH dependent. Soil solution and soil mobility data support the observation that soil application followed by root entry is more effective in delivering phytotoxic concentrations to the regenerative tissues of torpedograss than foliar application.

Keywords

CGA-362622torpedograss, Panicum repens L. #3 PANREHerbicide translocationsoil mobilitysoil pHsoil sorptionWAT, weeks after treatment
Type
Research
Information
Weed Technology , Volume 17 , Issue 2 , June 2003 , pp. 366 - 372
Copyright
Copyright © Weed Science Society of America 

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