N. KOVATCHEVA and N. NEDKOV
Institute for Roses, Aromatic and Medicinal Plants, BG – 6100 Kazanlak, Bulgaria
KOVATCHEVA, N. and N. NEDKOV, 2012. Effect of application of basic (rejuvenating) pruning on production traits of oil – bearing rose. Bulg. J. Agric. Sci., 18: 578-582
Oil-bearing rose (Rosa damascena Mill. F. trigintipetala Dieck.) is a perennial crop, which is grown for 20-25, at the same place. After 8-10 year, rose bushes lose its active growth and gradually reduce the flower yields. To stop this aging, in rose-production practice is done periodically rejuvenate (pruning) of the rose bushes. There is limited information available on factors controlling yield and its components after application of basic (rejuvenating) pruning the bushes of oil-bearing roses. This study presents the results of the impact of 11 morphological characteristics on the flower yield in 4 varieties of roses. The effect on the variety is different. With the best productive capacity differs variety Eleina. Of the studied signs, greatest variation are number of flowering and vegetative twigs per plant, 68.49% and 66.97%, at least - the dimensions of flower. There was a strong positive correlation between the flower yield per plant and weight of a flower (0.519). The developed regression models can predict yields. PC analysis reduced the original characteristics in the experiment of 3 main components, explaining 72.48% of the total variation.