World Journal of Agricultural Research
ISSN (Print): 2333-0643 ISSN (Online): 2333-0678 Website: http://www.sciepub.com/journal/wjar Editor-in-chief: Rener Luciano de Souza Ferraz
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World Journal of Agricultural Research. 2013, 1(2), 25-29
DOI: 10.12691/wjar-1-2-1
Open AccessArticle

Effectiveness of Repeated Reduced Rates of Selective Broadleaf Herbicides for Postemergence Weed Control in Sugar Beet (Beta Vulgaris)

Hossein Najafi1, , Mohamad Bazoubandi2 and Naser Jafarzadeh3

1Weed Research Department, Iranian Crop Protection Research Institute, Tehran, Iran

2Mashhad Agricultural and Natural Resources Research Center, Mashhad, Iran

3West Azarbaijan Agricultural and Natural Resources Research Center, Orumieh, Iran

Pub. Date: May 02, 2013

Cite this paper:
Hossein Najafi, Mohamad Bazoubandi and Naser Jafarzadeh. Effectiveness of Repeated Reduced Rates of Selective Broadleaf Herbicides for Postemergence Weed Control in Sugar Beet (Beta Vulgaris). World Journal of Agricultural Research. 2013; 1(2):25-29. doi: 10.12691/wjar-1-2-1

Abstract

Field experiments were conducted at three sites (Karaj, Mashhad and Orumieh, Iran), during 2005 to determine the influence of reduced rates of broadleaf herbicides in different combinations on sugar beet and weeds. Experiments were laid out in a randomized complete block design with factorial arrangement of the treatments and three replications. The treatments were 10 different combined herbicides that applied at recommended (full rates) and reduced rates (half rates). Data were recorded 30 days after herbicide application on percentage of weed density and biomass reductions. The data for individual traits were subjected to the ANOVA technique and significant means were separated by the 's multiple range test. The analysis of the data showed that herbicide combinations and herbicide doses were statistically significant for all the parameters investigated except weed frequency reduction at and Orumieh. The interaction of herbicide combinations and doses could not reach the level of significance in any of the traits examined. The results indicated more efficacies of herbicides combinations when they used repeatedly in low-than labeled dose.

Keywords:
sugar beet tank mixed herbicides low dose weed

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