Seed productivity evaluation in perennial ryegrass (Lolium perenne L.) accessions
Zhelyazko Vulchinkov • Aneliya Katova
Institute of Forage Crops – Pleven, 5800, Bulgaria
Резюме
The aim of the study is to evaluate seed productivity of perennial ryegrass
accessions by estimating the mean arithmetic values of seed weight per plant (SP,
g) and ecological stability (CV, %). During the period 2017-2018, in Institute of
Forage Crops -Pleven, a collection of perennial ryegrass was studied in field nonirrigated
conditions on leached black soil, by block method, with a total of 16
accessions, individually arranged plants, by seedlings at a distance of 50 / 50 cm.
Each accession is represented by 25 plants. Individual harvesting of each accessions
was performed at the time of the technical maturity of the seeds. Seed productivity
per plant (SP, g) and variation coefficient (CV, %) were used as a major criterion
in the selection of elite genotypes. Francis and Kannenberg (1978) method with
average seed productivity parameters and average variation coefficient were applied
for allocation of each accession exceeding the mean values for the collection in the two consecutive years.
