Relationships between harvest index and some traits in cowpea, Vigna unguiculata (L.) Walp.
1988
Ogunbodede, B.A. (Ife Univ., Ibadan (Nigeria). Institute of Agricultural Research and Training)
10 high-yielding cowpea cultivars adapted to several ecological zones of Nigeria wee used. Simple linear correlation and stepwise multiple regression analyses were performed. There were significant differences between the ten cultivars for most of the traits investigated. Harvest index (HI) ranged from 27.1 % to 42.7 %. HI was positively and significantly correlated with weight of plants, pod length, number of pods per plant and number of seeds per pod but negatively correlated with threshing percentage. 2 cultivars significantly (P = 0.05) outyielded most of the other 8 cultivars in this study. The yields of the other 8 cultivars were not significantly different. Of all the traits investigated, number of pods per plant appeared to be the most important parameter that determined yield, accounting for 76.7 % of yield variation, with HI accounting for 6.6 %. Differences in threshing percentage accounted for most of the observed variation in HI in this study
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