Combining ability analysis for different biological nitrogen fixation traits in greengram (Vigna radiata (L.) Wilczek) was carried out under controlled conditions. Seven parental varieties and their F, hybrids were analysed for the estimation of combining ability and gene action under rhizobium inoculated, non-inoculated and absolute control situations. Analysis of variance revealed significant mean square due to general combining ability (gca) and specific combining ability (sca). The parents showed significant variation with respect to gca effect. The parent NDM- 88-14 is identified as the best parent having significant gca effect for all the biological nitrogen fixation traits. The hybrids showed sca effects at varying levels.
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