Dissertation/Thesis Abstract

Environmental Conditions, Variety, and Application Timing Influence on S-Metolachlor Sugarbeet Crop Safety
by Lueck, Andrew Bruce, M.S., North Dakota State University, 2017, 84; 10269346
Abstract (Summary)

Glyphosate-resistant weeds in North Dakota and Minnesota sugarbeet growing regions have necessitated research on S-metolachlor. S-metolachlor can be applied early-postemergence in sugarbeet but has not been labeled preemergence as reductions in sugarbeet safety have been observed. Field and growth chamber experiments were conducted to determine crop safety from S-metolachlor applied preemergence. S-metolachlor readily bonds to soil clay and organic matter. High clay and organic matter soils buffer S-metolachlor from soil solution and increase crop safety. Sugarbeet emergence was affected by soil series, temperature, and soil water, but was not affected by S-metolachlor or S-metolachlor rate. S-metolachlor affected sugarbeet growth, but a rate of 0.54 kg ai ha -1 was safe across soils and growing conditions. No differences in varietal tolerance were observed. S-metolachlor applied immediately after planting or at the cotyledon and two-leaf stage injured sugarbeet less than application 3, 5, or 7 d after planting.

Indexing (document details)
Advisor: Peters, Thomas J.
Commitee: DeSutter, Thomas, Helms, Ted, Howatt, Kirk, Zollinger, Richard
School: North Dakota State University
Department: Plant Sciences
School Location: United States -- North Dakota
Source: MAI 56/04M(E), Masters Abstracts International
Source Type: DISSERTATION
Subjects: Agronomy, Agriculture, Plant sciences
Keywords: Crop injury, Crop safety, Herbicide, S-metolachlor, Sugarbeet
Publication Number: 10269346
ISBN: 9781369817126
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