Genetic variability of seed yield and its components in grain cowpea (Vigna unguiculata (L.) Walp.) under coconut based farming systems

Thirty three grain cowpea genotypes were evaluated for yield and yield contributing characters under coconut based farming system. The genotypes showed significant difference for maturity period, yield and yield components. Phenotypic coefficient of variation was found to be higher than genotypic coefficient of variation for all the characters considered. Highest magnitude of PCV and GCV was observed for seed yield per plant. High GCV with correspondingly high values of PCV was observed for number of primary branches per plant, number of pods per plant, 100 seed weight and harvest index. All characters recorded high estimates of heritability. High heritability coupled with high genetic advance was observed for number of primary branches per plant, height of plant, number of pods per plant, number of seeds per pod, 100 seed weight, crop duration and harvest index indicating additive gene action for these characters and scope for improvement of these characters by selection.