Single-row plots for agronomic evaluation of flax (Linum usitatissimum L.) lines
The usefulness of short, single-row plots for preliminary agronomic evaluation of flax (Linum usitatissimum L.) breeding materials was assessed by comparing 25 cultivars and breeding lines in 1.5-m rows and in conventional multiple-row plots at four western Canadian locations. Line means over locations for plant height, maturity date, and grain yield were highly correlated in the two plot sizes. Heritability of yield (the reference unit was the mean of a line in four, four-replicate trials) was 0.66 for the single-row plots and 0.70 for the multiple-row plots. Two-site selection in 1.5-m single rows was predicted to give greater gains than single-site selection in multiple-row plots.Key words: Linum usitatissimum, plot size, heritability, genotypic correlation, predictred gains