Yield stability of some groundnut accessions in northern Ghana

Yield stability of 12 groundnut accessions mainly developed by ICRISAT and two check varieties were tested in multilocational trials covering four locations in northern Ghana during the 1994, 1996, and 1997 cropping seasons. The trial for each year was arranged in a randomized complete block design with four replications and analyzed following a factorial design of 14 genotypes W 3 years W 4 locations. Significant differences were obtained (a#0.05) for the main effects of genotypes, years, and locations as well as the first and second order interactions; 33 per cent of the variability in kernel yield was accounted for by genotype W year W location interaction whilst 26 per cent by genotype W location interaction. Proportions of the total variance due to yield differences between genotypes and genotype W year interaction were negligible. Yield stability as indicated by the regression coefficient, among-location variance, and the value of mean yield suggested that JL 24, an early-maturing variety, was the most adapted to marginal environments whereas the check variety, F-mix, maintained its superiority in adapting to favourable environments. : Ghana Jnl agric Sci. Vol.32(2) 1999: 137-14