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Evaluation of twelve cassava genotypes in derived Guinea Savanna agroecological zones of Nigeria
Abstract
Cultivar adaptability trials were conducted for two years in two different locations of derived guinea savanna agroecological zones of Nigeria, Ibadan (07' 22°E, 03' 55°N, temperature 27°C, relative humidity:60-80%, rainfall: 1308 mm), and Ilorin (08' 30°E, 04' 46°N, temperature 28°C, relative humidity 60-80%, rainfall 1050 mm) using 12 cassava genotypes. Data collected included number of tuberous root yield, shoot weight and harvest index. The results showed significant differences (P < 0.05) in cassava genotype performance among the environments (Ilorin, 1992/93; Ilorin 1993/94; Ibadan, 1992/93, Ibadan, 1992/93, Ibadan, 1993/94) for number of tuberous roots, shoot weight, fresh tuberous yield and harvest index. Cassava genotypes grown at Ilorin, 1993/94 had the highest mean values for the number of tuberous roots, fresh tuberous root yield, shoot weight and harvest index at 12 months after planting. Genotypic differences were observed across locations and years for tuberous root number, fresh cassava tuberous root yield shoot weight and harvest index. In across locations and years, TMS 30572, TMS 81/01635, TMS 82/00058 and TMS81/00110 had the highest mean values for total tuberous root number, shoot weight, fresh tuberous of tuberous root yield, shoot weight and harvest index. The results showed significant differences (P < 0.05) in cassava genotype performance among the environments (Ilorin, 1992/93; Ilorin 1993/94; Ibadan, 1992/93, Ibadan, 1992/93, Ibadan, 1993/94) for number of tuberous roots, shoot weight, fresh tuberous yield and harvest index. Cassava genotypes grown at Ilorin, 1993/94 had the highest mean values for the number of tuberous roots, fresh tuberous root yield, shoot weight and harvest index at 12 months after planting. Genotypic differences were observed across locations and years for tuberous root number, fresh cassava tuberous root yield shoot weight and harvest index. In across locations and years, TMS 30572, TMS 81/01635, TMS 82/00058 and TMS81/00110 had the highest mean values for total tuberous root number, shoot weight, fresh tuberous root yields and harvest index respectively. In Ibadan, TMS 82/00058 and TMS 91934 had the highest values for parameter measured whereas in Ilorin, TMS 30572, TMS 82/00058, TMS 81/01635 and TMS 81/00110 performed better than other genotypes tested. Stability analyses were carried out on fresh tuberous root yield. When all the rank sums were summed for each genotype used as a parameter for stability, the result showed that for tuberous root yield, TMS 82/00942, TMS 82/00058 and TMS 30572 could be the most stable genotypes for the derived guinea savanna ecology. TMS 30572 has been widely adopted in some parts of these areas. TMS 82/00942 and TMS 82/00058 are new genotypes which are promising for distribution to farmers in derived guinea savanna ecology.
Journal of Agriculture, Science and Technology Vol. 8 (1) 2006: pp. 92-102
