Title page for ETD etd-11022009-154616


Type of Document Dissertation
Author Hensley, Justin Brian
Author's Email Address jhensl2@lsu.edu,jhensley@agcenter.lsu.edu
URN etd-11022009-154616
Title Effects of Simulated Drift of Glyphosate, Imazethapyr, Glufosinate, and Imazamox to Non-transgenic Rice
Degree Doctor of Philosophy (Ph.D.)
Department Agronomy & Environmental Management
Advisory Committee
Advisor Name Title
Webster, Eric P. Committee Chair
Griffin, James L. Committee Member
Linscombe, Steven D. Committee Member
Miller, Donnie K. Committee Member
Hammond, Jr., Abner M. Dean's Representative
Keywords
  • herbicide drift
  • rice
  • glyphoste drift
  • imazethapyr drift
  • glufosinate drift
  • imazamox drift
Date of Defense 2009-10-27
Availability unrestricted
Abstract
Four studies were conducted at the LSU AgCenter Rice Research Station near Crowley, Louisiana to evaluate the effects of simulated herbicide drift on ‘Cocodrie’ rice. Herbicides were applied at 6.3 and 12.5% of the labeled usage rate of 863 g ae/ha of glyphosate, 70 g ai/ha of imazethapyr, 493 g ai/ha of glufosinate, and 44 g ai/ha of imazamox. Herbicides were applied to rice at the 1-tiller, panicle differentiation (PD), boot, and physiological maturity growth stages. Spray volume varied proportionally to herbicide dosage and was 15 L/ha for the 6.3% rate and 29 L/ha for the 12.5% rate using 234 L/ha as the target spray volume and were applied with a tractor-mounted CO2-pressurized sprayer.

Glyphosate reduced plant height and primary and total crop yield, with the greatest reduction in primary crop yield resulting from glyphosate applied at boot. Primary crop rice seed germination was reduced by glyphosate. Glyphosate reduced ratoon crop rice seed weight; however, ratoon crop seed germination was not reduced.

Imazethapyr reduced plant height and primary and total crop yield, with the greatest reduction in primary crop yield resulting from imazethapyr applied at boot. Primary crop rice seed weight was reduced by imazethapyr applied at boot. Primary crop rice seed germination was reduced by imazethapyr. Ratoon crop rice seed germination was reduced by imazethapyr applied at PD.

Glufosinate reduced rice plant height and, when applied at boot, reduced primary and total crop yield. Primary crop rice seed germination and primary crop seedling vigor were reduced by glufosinate.

Imazamox reduced plant height and primary and total crop yield with the greatest reduction in yield observed from rice treated at boot. Primary crop rice seed germination was reduced by imazamox. Primary crop seedling vigor was reduced with imazamox applied at boot. Ratoon crop rice seed weight and germination was not affected by imazamox.

Simulated glyphosate, imazethapyr, glufosinate, and imazamox drift applications did not affect rice when applied at maturity. The greatest reduction in primary crop yield was observed when glyphosate, imazethapyr, glufosinate, and imazamox were applied to rice at boot and they all reduced primary crop rice seed germination.

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