Combining ability and heterosis for yield contributing traits in upland cotton (Gossypium hirsutum L.) von Abro, S. (Nuclear Inst. of Agriculture, Tandojam (Pakistan). Plant Breeding and Genetics Div.), Kandhro, M.M. (Nuclear Inst. of Agriculture, Tandojam (Pakistan). Plant Breeding and Genetics Div.), Laghari, S. (Nuclear Inst. of Agriculture, Tandojam (Pakistan). Plant Breeding and Genetics Div.), Arain, M.A, Deho, Z.A

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