Abstract: Exploiting heterosis is one of the methods to increase cotton yields that have stagnant in recent years. Thus, an experiment was conducted during the years 2009-2011 to explore the possibilities of utilization of some F2 hybrid combinations for commercialization. Ten F1 and F2 hybrids and their 6 parents were tested in a four replicated randomized complete block design for their economic traits at Sindh Agriculture University, Tandojam Farm. Results revealed that out of 10, 8 F1 hybrids gave positive mid parent heterosis in F¬1 generation during the year 2010, whereas positive better parent heterosis was observed in 5 hybrids for seed cotton yield. Regarding heterosis in F2 generations, it was observed that 5 F2 hybrids gave mid parent heterosis while 4 gave positive heterosis against better parent values. The maximum increase of 13.88% over mid parent was exhibited by the F1 hybrid combination CRIS-342 x MNH-886 and the same combination gave 20.46% increase over mid parent in F2 generation. It is interesting to note that this combination has shown increased hybrid vigour (heterosis) in F2 generation as compared to F1 generation. Thus the combination CRIS-342 x MNH-886 may be used commercially because of the fact that the F1 seed production is very expensive hence this combination may serve the purpose of high yields through heterosis breeding and 20% increase is quite satisfactory.

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[Munaiza Baloch (2014); EXPLORATION OF POSSIBILITIES OF F2 COTTON HYBRIDS FOR UTILIZATION AS COMMERCIAL CROP Int. J. of Adv. Res. 2 (10). 0] (ISSN 2320-5407). www.journalijar.com

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