Forage 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 productivity of perennial ryegrass accessions
by estimating the mean arithmetic values of dry mass productivity (DMP, g) and
variation coefficient (CV, %). During the period 2017-2018, in Institute of Forage
Crops -Pleven, a collection of English ryegrass was studied in field non-irrigated
conditions on leached black soil, by block method, with a total of 21 accessions,
individually arranged plants, by seedlings at a distance of 50 / 50 cm. Each accession
is represented by 25 individual plants. The forage productivity rating is performed
on dry mass productivity, determined by the ratio of fresh to dry mass, and presents
mean, minimum, maximum values, standard deviations on growths and years, total
average for the collection. Francis and Kannenberg (1978) was used with average
dry mass production parameters (DMP, g) and average variation coefficient (CV, %)
selected genotypes of each variety exceeding the average values for the collection in the two consecutive years. It has been established that the forage productivity
vary depending on the genotype - variety or ecotype, ploidy level, maturity group;
seasonal variations (growths and years), as well as growing conditions (fertilization,
drought, cold, low and high temperatures, etc.). The highest average annual yield
of dry mass and ecological stability for both years is taken into account in the
accessions of perennial ryegrass Roy, Merlinda, Floris, Meracoli and Meltador.
Key words: DMP (Dry Mass Productivity), Perennial ryegrass, Forage
productivity
