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Effect of Nicosulfuron on Johnsongrass (Sorghum halepense) Control and Corn (Zea mays) Performance

Published online by Cambridge University Press:  12 June 2017

Nagabhushana G. Gubbiga ,
A. Douglas Worsham ,
Harold D. Coble  and
Richard W. Lemons
Nagabhushana G. Gubbiga
Affiliation:
Crop Sci. Dep., North Carolina State Univ., Raleigh, NC 27695-7620
A. Douglas Worsham
Affiliation:
Crop Sci. Dep., North Carolina State Univ., Raleigh, NC 27695-7620
Harold D. Coble
Affiliation:
Crop Sci. Dep., North Carolina State Univ., Raleigh, NC 27695-7620
Richard W. Lemons
Affiliation:
Crop Sci. Dep., North Carolina State Univ., Raleigh, NC 27695-7620
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Abstract

Field experiments were conducted at two locations in North Carolina during the summer of 1992 to ascertain the reasons for stunted growth of corn noticed occasionally in fields treated POST with nicosulfuron to control dense infestations of johnsongrass. Treatments consisted of nicosulfuron at 35 g ai/ha sprayed POST, either over-top or post-directed only to johnsongrass in a single early application or in sequential applications of 17.5 g/ha. Checks included a hand-weeded, paraquat post-directed to johnsongrass, and non-weeded. Nicosulfuron provided satisfactory control of johnsongrass irrespective of whether applied once or sequentially. Corn yield in nicosulfuron-treated plots was as much as three times greater than in non-treated plots depending on hybrid and location. In the absence of johnsongrass interference, nicosulfuron caused a corn yield reduction of 6 to 9%. However, in the presence of johnsongrass interference, an additional 16 to 26% reduction in yield occurred with a POST application of nicosulfuron. Reductions in corn plant height and dry matter accumulation also were noticed for nicosulfuron treatments compared to post-directed application of paraquat and hand removal of johnsongrass.

Keywords

Nicosulfuron, 2-[[[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]-N,N-dimethyl-3-pyridinecarboxamideparaquat, 1,1′-dimethyl-4,4′-bipyridinium ionjohnsongrass, Sorghum halepense (L.) Pers. # SORHAcorn, Zea mays L. ‘DeKalb 689,’ ‘Pioneer 3140.’Allelopathyfoliar uptakeleachingpost-directedpostemergenceroot exudation and transferroot uptakesplit applicationSORHA
Type
Research
Information
Weed Technology , Volume 9 , Issue 3 , September 1995 , pp. 574 - 581
Copyright
Copyright © 1995 by the Weed Science Society of America 

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