ISHS Acta Horticulturae 380: Symposium on Tropical Root Crops in a Developping Economy
YIELD STABILITY PARAMETERS FOR COMPARING CASSAVA VARIETIES |
| Author: | J.M. Ngeve |
| Abstract:
Nine experimental cassava clones and three local cultivars were grown for 2 years in 3 locations in Cameroon to study their performance and adaptation. Root yields among improved clones ranged from 19.0 to 22.5 t/ha. Clone 1005 produced the highest root yield (22.5 t/ha), followed by clones ZZZ84 (20.5 t) and 1171 (19.0 t/ha). The local check, LN3, yielded the least (14.0 t/ha). The four stability methods used- Eberhart and Russell (1966), Perkins and Jinks (1968), Shukla (1972), and Francis and Kannenberg (1978)-differed in some cases in identifying stable cultivars. The Shukla method and the Francis and Kannenberg genotype grouping technique were most effective. Eberhart and Russell's b and Perkins-Jinks' B parameters were highly correlated (rs = 0.98**) as well as Eberhart and Russell's sd2 with Shukla's s2 parameters (rs = 1.00**). Clone 1005 was rated as most stable by all stability methods, followed by clone 1385. Cultivars LN2 and LN3 were rated least stable. The study shows that stability methods may be useful both in selecting cultivars for release to farmers and in identifying genotypes that could be useful as parents in future cassava breeding programs in Cameroon. | |
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