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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue Jul 2015, 36 (4)                                     Back


nstantaneous and historical temperature effects on a-pinene

Efficacy evaluation of selected herbicides on weed control and productivity evaluation of Bt cotton in Punjab

 

Kulvir Singh* and Pankaj Rathore

Punjab Agricultural University, Regional Research Station, Faridkot-151 203, India

*Corresponding Author?s E-mail: kulvir@pau.edu

 

 

 

 Publication Data

Paper received:

05 February 2014

 

Revised received:

07 July 2014

 

Accepted:

28 August 2014

 

Abstract

Field experiments were conducted during Kharif 2012 and 2013 to evaluate the efficacy of different herbicides for weed management in cotton. Highest seed cotton yield (3537.3 kg ha-1) was recorded in weed free plots followed by pendimethalin @1.0kg a.i ha-1 as Pre.em.+quizalofopethyl @50g a.i ha-1 post-em at 2-4 weed leaf stage + one hoeing (3318.9 kg ha-1) owing to improved number of bolls per plant and boll weight. Statistically least yield was recorded under weedy check (1435.4 kg ha-1). Application of pyrithiobac sodium could not express any visible toxic effect on crop indicating its selectivity for cotton, although none of the tested new chemicals i.e., pyrithiobac sodium@ 62.5g a.i ha-1 and quizalofopethyl @50g a.i ha-1 when applied alone could not outperform the existing recommended chemicals for weed management. Yield losses to the extent of 6.2-59.4% were recorded due to weed competition. Weed control efficiency (WCE) was highest under weed free check (86.8%) followed by pendimethalin @1.0kg a.i ha-1 as Pre. em.+quizalofopethyl @50g a.i ha-1, at 2-4 weed leaf stage + one hoeing (73.7%) , whereas minimum values were for weedy check (24.7%). Though net returns (`94660 ha-1) were highest for weed free check but higher B:C ratio (2:11) was observed for pendimethalin @1.0kg a.i ha-1 as Pre em.+quizalofopethyl @50g a.i ha-1 post-em at 2-4 weed leaf stage+one hoeing . Therefore, for reasons such as labor shortage besides their timely availability, using? these herbicides in combination with cultural practices could be the practical solution for economically efficient and effective weed management. ?    

 

 

 Key words

Herbicide, Seed cotton yield, Sympods, Weed control efficiency 

 

 

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