Repeatability, number of harvests, and phenotypic stability of dry matter yield and quality traits of Panicum maximum jacq.
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Universidade Estadual de Maringá
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Selection of superior forage genotypes is ba sed on agronomic traits assayed in repeated measures. The questions are how repeatable the perf ormance of individual genotypes is and how many harvests are needed to select the best genotypes. The ob jectives were to estimate repeatability coefficients of dry matter yield (DMY) and forage quality, their phen otypic stability and the number of harvests needed for an accurate selection. Two randomized complete block design experiments data with 24 genotypes each, undergoing 12 and 16 harvests, over a period of 2 and 3 years, respectively, were used. The DMY repeatability estimates ranged from 0.42 to 0.55, suggesting a low heritability. The mean numbers of repeated measures were 5 and 7 harvests for 0.80 and 0.85 accuracy, respectively. The inclusion of the first two harvests negatively affects the estimates. Repeat ability for quality traits ranged from 0.30 to 0.69, indicating low to moderate heritability.
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Agrociencias