HomeInternational Rice Research Notesvol. 22 no. 3 (1997)

Variability and Heritability Estimates of Yield and Yield Components in Some Nigerian Lowland Rice Genotypes

T. Vange | A. A. Ojo

Discipline: Agriculture, Genetics



The essential aspects of most, if not all, breeding programs can be divided into three stages: assembly or creation of a pool of variable germplasm, selection of superior individuals from the pool, and use of selected material for creating new populations to be employed as either potential commercial varieties or the base for a new cycle of selection. Estimates of genetic variance and heritabilities can be of value in all three stages.


We studied 10 early-duration and 12 medium-duration rice genotypes during the 1994-95 cropping season (Jul-Nov) at the University Experimental Research Station (UERS) to select promising genotypes. The experiment was laid out using a randomized complete block design with 4- × 3-m plots and three replicates for the medium-duration genotypes and four for the early-duration genotypes.