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Response of Sweetpotato Cultivars to S-metolachlor Rate and Application Time

Published online by Cambridge University Press:  20 January 2017

Stephen L. Meyers ,
Katherine M. Jennings  and
David W. Monks
Stephen L. Meyers*
Affiliation:
Department of Horticultural Science, N. C. State University, Raleigh, NC 27695
Katherine M. Jennings
Affiliation:
Department of Horticultural Science, N. C. State University, Raleigh, NC 27695
David W. Monks
Affiliation:
Department of Horticultural Science, N. C. State University, Raleigh, NC 27695
*
Corresponding author's E-mail: slmeyers@ncsu.edu
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Abstract

Studies were conducted in 2008 and 2009 to determine the effect of S-metolachlor rate and application time on sweetpotato cultivar injury and storage root shape under conditions of excessive moisture at the time of application. S-metolachlor at 1.1, 2.2, or 3.4 kg ai ha−1 was applied immediately after transplanting or 2 wk after transplanting (WATP) to ‘Beauregard’, ‘Covington’, ‘DM02-180’, ‘Hatteras’, and ‘Murasaki-29’ sweetpotato. One and three d after S-metolachlor application plots received 1.9 cm rainfall or irrigation. S-metolachlor applied immediately after transplanting resulted in increased sweetpotato stunting 4 and 12 WATP, decreased no. 1 and marketable sweetpotato yields, and decreased storage root length to width ratio compared with the nontreated check. Sweetpotato stunting, no. 1 and marketable yields, and storage root length to width ratio in treatments receiving S-metolachlor 2 WATP were similar to the nontreated check. In 2008, Covington and Hattaras stunting 12 WATP was greater at 2.2 and 3.4 kg ha−1 (11 to 16%) than 1.1 kg ha−1 (1 to 2%). In 2009, S-metolachlor at 3.4 kg ha−1 was more injurious 4 WATP than 2.2 kg ha−1 and 1.1 kg ha−1. While cultivar by treatment interactions did exist, injury, yield, and storage root length to width ratio trends were similar among all cultivars used in this study.

En 2008 y 2009, se realizaron estudios para determinar el efecto de la dosis de S-metolachlor y el momento de aplicación en el daño y la forma de las raíces de almacenamiento en diferentes cultivares de batata, bajo condiciones de humedad excesiva al momento de la aplicación. El S-metolachlor fue aplicado a 1.1, 2.2 ó 3.4 kg ai ha−1, inmediatamente después del trasplante o 2 semanas después del trasplante (WATP) a los cultivares de batata ‘Beauregard’, ‘Covington’, ‘DM02-180’, ‘Hatteras’ y ‘Murasaki-29’. Uno y tres días después de la aplicación de S-metolachlor, las parcelas recibieron 1.9 cm de lluvia o riego. El S-metolachlor aplicado inmediatamente después del trasplante resultó en un crecimiento limitado 4 y 12 WATP, disminución en el rendimiento de batatas no. 1 y comercializables, y un menor ratio entre el largo y el grosor de la raíz de almacenamiento, comparado con el tratamiento testigo sin aplicación. El crecimiento limitado, los rendimientos no. 1 y comercializable, y el ratio entre largo y grosor de la raíz de almacenamiento en los tratamientos que recibieron S-metolachlor 2 WATP fueron similares al testigo no tratado. En 2008, el crecimiento limitado mostrado por Covington y Hatteras 12 WATP fue mayor a 2.2 y 3.4 kg ha−1 (11 a 16%) que a 1.1 kg ha−1 (1 a 2%). En 2009, el S-metolachlor a 3.4 kg ha−1 fue mucho más dañino 4 WATP que a 2.2 y 1.1 kg ha−1. Aunque existieron interacciones entre cultivares y tratamientos, las tendencias en daño, rendimiento, y el ratio entre largo y grosor de la raíz de almacenamiento fueron similares entre todos los cultivares usados en este estudio.

Keywords

S-metolachlorsweetpotato, Ipomoea batatas L. Lam. ‘Beauregard’, ‘Covington’, ‘DM02-180’, ‘Hatteras’, and ‘Murasaki-29’Crop toleranceherbicide rate
Type
Weed Management—Other Crops/AREAS
Information
Weed Technology , Volume 26 , Issue 3 , September 2012 , pp. 474 - 479
Copyright
Copyright © Weed Science Society of America 

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