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        Association and Path Coefficients Analysis of Fresh Root Yield of High and Low Cyanide Cassava (Manihot esculenta Crantz) Genotypes in the Humid Tropics

        Dominic Aja Okpara,Emmanuel Ukaobasi Mbah,Thomas Ogon Ojikpong 한국작물학회 2014 Journal of crop science and biotechnology Vol.17 No.2

        Thirty-eight high- and low-cyanide cassava genotypes were examined in the 2004 and 2005 cropping seasons at Umudike, southeasternNigeria using RCBD with three replications. Simple correlation associations and path coefficients analyses were computedamong agronomic characters with the aim of understanding the interrelationships of these characters and the extent of their contributionto the root yield of cassava. There was a significant (P≤ 0.05) positive correlation between root yield and number of rootsplant-1 with correlation coefficients (r) of 0.57, average weight of root (r = 0.58) in high-cyanide cassava genotypes, while in lowcyanide cassava genotypes, fresh root yield was highly significantly (P≤ 0.01) correlated with average weight of root (r = 0.74). Path analysis showed that average weight of root had the highest direct effect in high (0.66) and in low cyanide (0.67) cassava genotypes. Also, the number of roots plant-1 in both types of cassava exerted a positive direct effect on fresh root yield, however, a minimumeffect was obtained by number of leaves plant-1 (0.22) in high-cyanide cassava and number of stems plant-1 (-0.13) in lowcyanidecassava genotypes. Average weight of roots in high- and low-cyanide cassava genotypes had 98 and 89% direct effects,respectively, on yield of cassava. The results indicated the importance of average weight of roots and other characters such as numberof roots plant-1, plant height, and number of leaves plant-1 in determining increased yield hence priority must be accorded it duringselection aimed at increasing cassava root yield

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        Genotype by Planting Date Effects on Cowpea in Humid Fringes, Southeast Nigeria

        Godson Emeka Nwofia,Chinenye Rozzy Onyekwere,Emmanuel Ukaobasi Mbah 한국육종학회 2018 Plant Breeding and Biotechnology Vol.6 No.2

        A two-year factorial arranged field experiment in randomized complete block design with three replications was carried out in 2014 and 2015 at Michael Okpara University of Agriculture Teaching and Research Farm, Umudike (latitude 05° 29'N; longitude 07° 33'E; altitude 122 m above sea level), Nigeria. The objectives were to assess growth and yield response of twenty newly released cowpea genotypes to different planting dates (July, August and September). Plant height, number of leaves/plant, number of branches/plant, shoot biomass, total dry matter, number of nodules/plant, weight of pod, number of seeds/pod, seed weight/pod and grain yield varied amongst the genotypes and across the different planting dates in both years. The association between grain yield and other variables analysed across both years was significant and positive except 100-seed weight and the phenological characters of the plant. Path coefficients analysis across two years indicated that seed weight/pod followed by number of branches/plant and number of seeds/pod had positive direct effect on grain yield of cowpea in contrast to characters that exhibited negative but direct effect on yield. The other traits had relatively negligible to low indirect effects that were positive through other component traits. The grain yield sequence of interaction between genotype and date of planting was in this order: IT06K-141 planted in July > IT11K-61-82 planted in September > IT99K-573-1-1 planted in August. IT06K-141 genotype was considered to be better endowed genetically while the mean across both years indicated August as appropriate planting date to ensure high and sustainable grain yield.

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