Study on the productive potential of perennial ryegrass grown in pure stand and in mixtures with alfalfa

摘要

The aim is to explore the productive potential of the first Bulgarian perennial ryegrass variety Harmoniya and the first candidate tetraploid variety NBG, grown alone and in mixed crops of alfalfa - the most popular varieties of IFC - Pleven 6 and Dara. During the period 2012-2014, in the IFC-Pleven the field experiment was carried on black soil under rainfed conditions, block method in three replications. Variants of the experiment are 8: 1 to 4 - pure stands, individual crops, and from 5 to 8 - mixed - binary.Data are presented for fresh and dry matter yield (average, minimum, maximum, standard deviation and coefficient of variation) by regrowths and years and its distribution as a share of overall productivity% for the year and for the period.In ryegrass were harvested a total of 11 regrowths, while alfalfa and mixtures in 13 regrowths. It was found that in pure stand cultivation of perennial ryegrass variety Harmoniya has a higher yield of drymatter 21214.9 kg ha~(-1). Breeding tetraploid population NBG has higher total yield of green mass 98137.1 kg ha~(-1) to 86886.7 kg ha~(-1) for Harmoniya and with more even distribution by cuts, and in the third year exceeds Harmoniya on both characters.