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Use of Wild Radish (Raphanus raphanistrum) and Rye Cover Crops for Weed Suppression in Sweet Corn

Published online by Cambridge University Press:  20 January 2017

Mayank S. Malik ,
Jason K. Norsworthy ,
A. Stanley Culpepper ,
Melissa B. Riley  and
William Bridges Jr.
Mayank S. Malik*
Affiliation:
Department of Entomology, Soils and Plant Sciences, Clemson University, 277 Poole Agricultural Center, Clemson, SC 29634
Jason K. Norsworthy
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, 1366 West Altheimer Drive, Fayetteville, AR 72704
A. Stanley Culpepper
Affiliation:
Department of Crop and Soil Sciences, University of Georgia, P.O. Box 1209, Tifton, GA 31794
Melissa B. Riley
Affiliation:
Department of Entomology, Soils and Plant Sciences, Clemson University, 120 Long Hall, Clemson, SC 29634
William Bridges Jr.
Affiliation:
Department of Applied Economics and Statistics, Clemson University, 243 Barre Hall, Clemson, SC 29634
*
Corresponding author's E-mail: mmalik@clemson.edu
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Abstract

Field experiments were conducted near Blackville, SC, and Tifton, GA, in 2004 and 2005, to evaluate the effect of wild radish and rye cover crops on weed control and sweet corn yield when used in conjunction with lower-than-recommended herbicide rates. Cover crop treatments included wild radish, rye, and no cover crop, alone and in conjunction with half and full rates of atrazine (0.84 and 1.68 kg ai ha−1) plus S-metolachlor (0.44 and 0.87 kg ai ha−1) applied before sweet corn emergence. Florida pusley, large crabgrass, spreading dayflower, ivyleaf morningglory, and wild radish infested the test sites. Wild radish and rye cover crops without herbicides reduced total weed density by 35 and 50%, respectively, at 4 wk after planting (WAP). Wild radish in conjunction with the full rate of atrazine plus S-metolachlor controlled Florida pusley, large crabgrass, and ivyleaf morningglory better than rye or no cover crop treated with a full herbicide rate in 2004 at Blackville. In 2005, at Blackville, weed control in sweet corn following wild radish cover crop plots alone was not different from that following rye. Wild radish or rye in conjunction with a half or full rate of atrazine and S-metolachlor controlled > 95% Florida pusley, wild radish, and large crabgrass in sweet corn at Tifton during both years. Ten glucosinolates, potential allelopathic compounds, were identified in wild radish, including glucoiberin, progoitrin, glucoraphanin, glucoraphenin, glucosinalbin, gluconapin, glucotropaeolin, glucoerucin, glucobrassicin, and gluconasturtin. Sweet corn yields at Blackville and Tifton following wild radish or rye cover crops were similar between the half and full rates of atrazine plus S-metolachlor. Sweet corn in wild radish or rye cover crop plots without herbicides produced less-marketable ears than herbicide-treated plots, indicating that a combination of cover crops and herbicides are required to optimize yields and to obtain desirable weed control.

Keywords

AtrazineS-metolachlorFlorida pusley, Richardia scabra L. RCHSCivyleaf morningglory, Ipomoea hederacea Jacq. IPOHElarge crabgrass, Digitaria sanguinalis (L.) Scop. DIGSAspreading dayflower, Commelina diffusa Burm. f. COMDIwild radish Raphanus raphanistrum L. RAPRArye, Secale cereale L. ‘Wrenz’sweet corn, Zea mays L. ‘Silver Queen’, ‘Summer Sweet’, ‘Prime Plus’Allelopathycover cropsglucosinolatesIWMreduced herbicide rates
Type
Weed Management
Information
Weed Science , Volume 56 , Issue 4 , August 2008 , pp. 588 - 595
Copyright
Copyright © Weed Science Society of America 

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