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Main Article Content
Growth and Principal Component Analysis of Some Selected Sweet Potato Genotypes Grown in Southeast Nigeria
Abstract
A field experiment was conducted at the National Root Crops Research Institute Umudike to determine the growth and path analysis (PCA) of some selected sweet potato genotypes in south-east Nigeria. The sweet potato genotypes (Centennial, Umuspo 3 (Mother’s Delight), TIS 8164, Ex-Igbariam, TIS 87/0087, Umuspo 1(King J ), Solomon 2) were fitted into a randomized complete block design (RCBD) with four replications. Principal component analysis revealed that PC1, PC2, and PC3 with eigenvector value loads above unity accounted for the cumulative variance of 84.10 %, indicating the degree of influence the associated growth parameters had on fresh storage root yield of sweet potato in both cropping seasons. In PC1, Leaf area ratio (LAR) and Specific leaf area (SLA) with the vector loading of 0.44605 and 0.39781 (2014) and 0.38409 and 0.36831 (2015), cropping seasons accounted for 47.54% variability among the genotype. PC2 with the same plant character also gave the highest vector load in the 2015 cropping season. In PC4, except for the relative growth rate (2014) and leaf area ratio, specific leaf area, and net assimilation rate (2015), the other principal components influenced the tuber root yield of sweet potatoes. In PC4 CGR, LAR, SLA, TDW, NAR 2014 CGR, RGR, and TDW 2015 influenced the tuber root yield of sweet potato. The results further suggested that the improvement of sweet potato could be achieved through these characteristics that have a positive magnitude effect on tuber root yield. Umuspo 1 (King J ) gave the highest tuber yield among other sweet potato genotypes and therefore can be recommended for farmers.
