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Yellow Nutsedge Interference in Polyethylene-Mulched Bell Pepper as Influenced by Turnip Soil Amendment

Published online by Cambridge University Press:  20 January 2017

Sanjeev K. Bangarwa ,
Jason K. Norsworthy ,
John D. Mattice  and
Edward E. Gbur
Sanjeev K. Bangarwa
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, 1366 West Altheimer Drive, Fayetteville, AR 72704
Jason K. Norsworthy*
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, 1366 West Altheimer Drive, Fayetteville, AR 72704
John D. Mattice
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, 1366 West Altheimer Drive, Fayetteville, AR 72704
Edward E. Gbur
Affiliation:
Agricultural Statistics Laboratory, University of Arkansas, 101 Agricultural Annex Building, Fayetteville, AR 72701
*
Corresponding author's E-mail: jnorswor@uark.edu
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Abstract

Methyl bromide has been widely used as a broad-spectrum fumigant for weed control in polyethylene-mulched bell pepper. However, because of environmental hazards, the phase-out of methyl bromide requires development of alternative weed management strategies. Brassicaceae plants produce glucosinolates which are hydrolyzed to toxic isothiocyanates following tissue decomposition, and therefore can be used as a cultural strategy. Field experiments were conducted in 2007 and 2009 to study the influence of soil amendment (‘Seventop’ turnip cover crop vs. fallow) and the effect of initially planted yellow nutsedge tuber density (0, 50, and 100 tubers m−2) on the interference of yellow nutsedge in raised-bed polyethylene-mulched bell pepper. Total glucosinolate production by the turnip cover crop was 12,635 and 22,845 µmol m−2 in 2007 and 2009, respectively, and was mainly contributed by shoots. In general, soil amendment with the turnip cover crop was neither effective in reducing yellow nutsedge growth and tuber production nor in improving bell pepper growth and yield compared to fallow plots at any initial tuber density. Averaged over cover crops, increasing initial tuber density from 50 to 100 tubers m−2 increased yellow nutsedge shoot density, shoot dry weight, and tuber production ≥ 1.4 times. However, increased tuber density had minimal impact on yellow nutsedge height and canopy width. Compared to weed-free plots, interference of yellow nutsedge reduced bell pepper dry weight and marketable yield ≥ 42 and ≥ 47%, respectively. However, bell pepper dry weight and yield reduction from 50 and 100 tubers m−2 were not different. Light was the major resource for which yellow nutsedge competed with bell pepper. Yellow nutsedge shoots grown from initially planted 50 and 100 tubers m−2 caused up to 48 and 67% light interception in bell pepper, respectively. It is concluded that yellow nutsedge interference from initial densities of 50 and 100 tubers m−2 are equally effective in reducing bell pepper yield and that soil biofumigation with turnip is not a viable management option for yellow nutsedge at these densities.

El methyl bromide ha sido ampliamente usado como fumigante de amplio espectro para el control de malezas en el cultivo de pimiento con cobertura de polietileno. Sin embargo, la eliminación gradual del uso de methyl bromide debido a riesgos ambientales, requerirá del desarrollo de estrategias alternativas para el manejo de malezas. Las plantas de la familia Brassicaceae producen glucosinolates, los cuales son hidrolizados a isothiocyanates, después de la degradación de su tejido. Por lo tanto pueden ser usados como estrategia de control cultural. Se llevaron a cabo experimentos de campo en 2007 y 2009 para estudiar la influencia de enmiendas de suelo (Brassica rapa “Seventop” vs. Barbecho) y el efecto de la densidad de tubérculos de Cyperus esculentus plantada al inicio (0, 50 y 100 tubérculos m2) en la interferencia de esta maleza en el cultivo de pimiento en camas con cobertura de polietileno. La producción total de glucosinolates producida por B. rapa fue 12,635 y 22,845 µmol m−2 en 2007 y 2009, respectivamente, y fue aportada principalmente por el tejido aéreo de las plantas. En general, en comparación con el tratamiento en barbecho en cualquiera de las densidades de tubérculos, el uso de la enmienda de B. rapa no fue efectivo para reducir el crecimiento de C. esculentus o la producción de tubérculos, ni para mejorar el crecimiento y el rendimiento del pimiento. Promediando los tratamientos de coberturas, al aumentar la densidad inicial de tubérculos de 50 a100 m−2, se incrementó la densidad de plantas, el peso seco de la parte aérea y la producción de tubérculos en ≥1.4 veces. Sin embargo, el incremento de la densidad de tubérculos tuvo un impacto mínimo en la altura y ancho del dosel de C. esculentus. Comparado con los lotes libres de maleza, la interferencia de C. esculentus disminuyó el peso seco del pimiento y el rendimiento comercial ≥ 42 y ≥ 47%, respectivamente, aunque no hubo diferencias en estas variables entre los tratamientos 50 y 100 tubérculos por m−2. La luz solar fue el mayor recurso por el cual C. esculentus compitió con el pimiento. Las plantas de esta maleza crecidas a partir de las densidades iniciales de 50 y 100 tubérculos m−2, causaron una intercepción de luz de hasta 48 y 67%, respectivamente. Se concluye que la interferencia causada por densidades iniciales de 50 y 100 tubérculos de C. esculentus m−2, son igualmente efectivas en reducir los rendimientos del pimiento y que la biofumigación con B. rapa no es una opción viable para el manejo de esta maleza a estas densidades.

Keywords

Yellow nutsedge, Cyperus esculentus L. CYPESbell pepper, Capsicum annuum L. ‘Heritage’turnip, Brassica rapa L. ‘Seventop’Biofumigationcompetitioncover cropintegrated weed managementmethyl bromide alternative
Type
Weed Biology and Competition
Information
Weed Technology , Volume 25 , Issue 3 , September 2011 , pp. 466 - 472
Copyright
Copyright © Weed Science Society of America 

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