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Journal of Environmental Biology

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

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        Abstract - Issue Sep 2014, 35 (5)                                                                                                             Back



nstantaneous and historical temperature effects on a-pinene

Productivity potential and monetary evaluation of Bt cotton hybrids

under varied agronomic manipulations in semi-arid conditions

 

 

Kulvir Singh*, Pankaj Rathore and R. K. Gumber

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

*Corresponding Author’s Email : kulvir@pau.edu 

 

 

 

Publication Data

Paper received:

14 March 2013

 

Revised received:

30 July 2013

 

Accepted:

16 August 2013

 

Abstract

Field experiments comprising three Bt cotton hybrids in main, two plant geometries in sub and three nutrient levels in sub sub plots of Split Plot design replicated thrice were conducted  at PAU, Regional Research Station, Faridkot during Kharif 2010 and 2011. MRC7361 recorded significantly the highest SCY (3121.6 kg ha-1) followed by Bioseed 6488 (2649.5 kg ha-1) and RCH134 (2107.4 kg ha-1). Statistically improved bolls per plant and boll weight primarily helped MRC7361 in achieving the highest yield. Owing to better fertilizer use efficiency (5.47) and water productivity (649.3 gm-3 ), highest net returns of `101047 ha-1 were observed with MRC7361 as compared to Bioseed 6488 (` 83343 ha-1) and RCH134 (` 63014 ha-1). Bolls per plant and benefit cost ratio was significantly enhanced under wider geometry of 67.5 x 90 cm. Application of 225 kg N, 45kg P ha-1 produced significantly higher SCY (2825.9 kg ha-1) owing to improved sympods and bolls per plant than 150kg N, 30kg P ha-1 (2374.9 kg ha-1) and 187.5kg N, 37.5kg P ha-1 (2677.6 kg ha-1). As a result of this, statistically highest net returns of ` 89552 ha-1 were obtained with application of 225 kg N, 45 kg P ha-1. Water productivity improved significantly with each successive increase in the level of nutrients. Contrarily, fertilizer use efficiency exhibited reverse trend with statistically highest value (5.08) for the lowest level of nutrients.

 

 Key words

 

Benefit cost ratio, Fertilizer use efficiency, Seed cotton yield, Water productivity

 

 

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