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• TITLE: Time of Application of S-Metolachlor Affects Growth, Marketable Yield and Quality of Carrot and Red Beet

  AUTHORS: Darren E. Robinson, Kristen E. McNaughton

  KEYWORDS: S-Metolachlor; Yield; Quality; Tolerance; Application Timing; Red Beet; Carrot

  JOURNAL NAME: American Journal of Plant Sciences, Vol.3 No.4, April 25, 2012

  ABSTRACT: Tolerance of carrot and red beet to s-metolachlor at three application timings—pre-emergence to crop (PRE), early postemergence (crop at two to four leaf stage-EPOST), and late postemergence (crop at five to seven leaf stage-LPOST) —was determined from 2008 to 2010. LPOST applications of s-metolachlor reduced carrot above ground plant dry weight, marketable yield and grower payment, but did not affect carrot length. PRE and LPOST applications of s-metolachlor reduced red beet above ground plant dry weight, total marketable yield, yield of No. 2 and No. 3 red beet, and grower payment. Our findings indicate that while carrot may be tolerant to PRE applications of s-metolachlor, applications made after the 5 leaf stage reduced plant dry weight enough to impact marketable yield and grower payment. In red beet, the potential reduction in growth, yield and grade would not justify the utility of a PRE or LPOST applica- tion timing.