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1 October 2013 Rate and Application Timing Effects on Tolerance of Covington Sweetpotato to S-Metolachlor
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Abstract

Field studies were conducted in 2011 and 2012 at the Horticultural Crops Research Station near Clinton, NC, to determine ‘Covington' sweetpotato tolerance to S-metolachlor rate and application timing. Treatments were a factorial arrangement of four S-metolachlor rates (0, 1.1, 2.2, or 3.4 kg ai ha−1) and six application timings (0, 2, 5, 7, 9, or 14 d after transplanting [DAP]). Immediately following application, 1.9 cm of irrigation was applied to individual plots. Sweetpotato injury was minimal for all treatments (≤ 10%). No. 1 grade sweetpotato yield displayed a negative linear response to S-metolachlor rate, and decreased from 25,110 to 20,100 kg ha−1 as S-metolachlor rate increased from 0 to 3.4 kg ha−1. Conversely, no. 1 sweetpotato yield displayed a positive linear response to S-metolachlor application timing and increased from 19,670 to 27,090 kg ha−1 as timing progressed from 0 to 14 DAP. Total marketable sweetpotato yield displayed a quadratic response to both S-metolachlor application rate and timing. Total marketable yield decreased from 44,950 to 30,690 kg ha−1 as S-metolachlor rate increased from 0 to 3.4 kg ha−1. Total marketable yield increased from 37,800 to 45,780 kg ha−1 as application timing was delayed from 0 to 14 DAP. At 1.1 kg ha−1 S-metolachlor, sweetpotato storage root length to width ratio displayed a quadratic relationship to application timing and increased from 1.87 to 2.23 for applications made 0 to 14 DAP. At 2.2 kg ha−1 of S-metolachlor, sweetpotato length to width ratio displayed a quadratic response to application timing, increased from 1.57 to 2.09 for 0 to 10 DAP, and decreased slightly from 2.09 to 2.03 for 10 to 14 DAP. Application timing did not influence length to width ratio of sweetpotato storage roots for those plots treated with S-metolachlor at either 0 or 3.4 kg ha−1.

Nomenclature: S-metolachlor; sweetpotato; Ipomoea batatas (L.) Lam. ‘Covington'

En 2011 y 2012, se realizaron estudios de campo en la Estación de Investigación de Cultivos Hortícolas, cerca de Clinton, NC, para determinar la tolerancia de la batata ‘Covington' según la dosis de S-metolachlor y el momento de aplicación. Los tratamientos fueron arreglados en forma factorial con cuatro dosis de S-metolachlor (0, 1.1, 2.2, ó 3.4 kg ai ha−1) y seis momentos de aplicación (0, 2, 5 7, 9, ó 14 días después del trasplante [DAP]). Inmediatamente después de la aplicación, se aplicaron 1.9 cm de riego a cada parcela. El daño a la batata fue mínimo en todos los tratamientos (≤10%). El rendimiento de batata grado no. 1 mostró una respuesta linear negativa a las dosis de S-metolachlor, y disminuyó de 25,110 a 20,100 kg ha−1 al incrementarse la dosis de S-metolachlor de 0 a 3.4 kg ha−1. En contraste, el rendimiento de la batata no. 1 mostró una respuesta linear positiva al momento de aplicación de S-metolachlor e incrementó de 19,670 a 27,090 kg ha−1 cuando se pasó de 0 a 14 DAP. El rendimiento comercializable disminuyó de 44,950 a 30,690 kg ha−1 al aumentarse la dosis de S-metolachlor de 0 a 3.4 kg ha−1. El rendimiento comercializable aumentó de 37,800 a 45,780 kg ha−1 cuando se retrasó el momento de aplicación de 0 a 14 DAP. A 1.1 kg ha−1 S-metolachlor, el ratio longitud/grosor de las raíces de almacenamiento mostraron una relación cuadrática con el momento de aplicación e incrementaron de 1.87 a 2.23 para aplicaciones hechas de 0 a 14 DAP. A 2.2 kg ha−1 de S-metolachlor, el ratio longitud/grosor mostró una respuesta cuadrática en respuesta al momento de aplicación, e incrementó de

Stephen L. Meyers, Katherine M. Jennings, David W. Monks, Donnie K. Miller, and Mark W. Shankle "Rate and Application Timing Effects on Tolerance of Covington Sweetpotato to S-Metolachlor," Weed Technology 27(4), 729-734, (1 October 2013). https://doi.org/10.1614/WT-D-13-00049.1
Received: 25 March 2013; Accepted: 1 June 2013; Published: 1 October 2013
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