Scientific Papers Series B Horticulture

the high temperatures recorded during thesummer, being a determinate factor in thedecrease of growth rate (Figure 11).The evolution of average temperatures recordedwas relatively even between the 2 years ofstudy, with differences of only 5 degrees beingrecorded in similar timeframes of the year.Figure 9. Average growth rate of ‘Ingrid Bergman’variety from the hybrid tea group“Red Berlin’s” growth was uneven during thegrowing season in the two years of study, witha peak in 2012 during May-June and aminimum in July; as for 2011, the maximumwas recorded in November and the minimum inOctober (Figure 10).Figure 11. Average temperature recorded at 14.00 duringthe growth season in 2011 and 2012Figure 10. Average growth rate of ‘Red Berlin’ varietyfrom the hybrid tea groupAll of these differences in growth rate arecorrelated with the average temperaturesrecorded during the months of April andDecember, between the years of 2011 and2012. In 2011 we can clearly see howtemperature uniformity caused a stable increasein the growing season for the majority ofvarieties studied. The graphs presented aboveshow how the cuts performed after the firstwave of blooming, which were different everyyear, did not influence the growth rhythm onthe majority of the varieties studied, with only375CONCLUSIONSThe majority of the varieties studied showedsignificant differences in growth rate during thegrowing seasons of the 2 years of study, theonly exception being the ‘Caprice de Meilland’variety which showed growth rate differencesin the month of October.Climatic conditions in spring resulted in theearliness of blooming in 2012, in comparison tothe same period of 2011.Differences in growth were not affected bymaintenance cuts, but with the advent of hightemperatures during the summer, it caused areduction in growth rate, which only returnedto normal once the drop in temperaturesappeared along with the autumn season.The variety with the most significant increasewas 'Angela', which is a park variety and hasshown an average increase of 135 cmmaximum in November 2011. At the oppositepole is the variety with the lowest growth,which is 'Forever Young’ from the floribundagroup with a maximum of 35.9 cm in July2011.