Abstract: As a result of global warming, in our country, especially in the West Plain where we conducted our experiment, the effect is clearly visible. In this situation, the autumn crops start their vegetation earlier in spring and are better in facing the summer drought. The paper aims at assessing the growth and development of species Lolium multiflorum L. under the influence of the temperatures recorded in Timişoara until the coming of winter. Thus, The Lolium multiflorum L. crop, SPRINT variety, was set up on the 25th September 2014. The sprouting took place 12 days after that, in which time the average maximum temperature was 150C and the average minimum temperature was 120C. The first assessment of the externalization of some characteristics (parameters) of Lolium multiflorum L. under the influence of the temperatures in the vegetation period took place 16 days after that, and the following four assessments were performed at successive seven days intervals. The research revealed that all parameters studied of species Lolium multiflorum L. increased, irrespective of the daily temperature variations in the vegetation periods analysed, and that these parameters are, to a larger or lesser extent, directly influenced by the average daily temperature (AT). Under the conditions in Timisoara in the timeframe of the experiment, there is positive correlation between the sum of temperature degrees (AD) and most characteristics assessed at Lolium multiflorum L. The total sum of temperature degrees (ADT), recorder in Timişoara, in the period under analysis, is correlated with the development of Lolium multiflorum L. plants, respectively with the increase in the main characteristics evaluated: clump height-BH, number of tillers in the clump – SN, clump weight - BW, number of leaves in a clump – LN and of course with the growth of the main root – LPR. In conclusion, the temperatures recorded at Timişoara, between September and November 2014, on a background of optimal moisture conditions, assured the growth and development of Lolium multiflorum L. plants, so these can begin winter well-rooted, with suitable height and number of tillers to survive the harsh winter conditions.

Key words: Lolium multiflorum L., average daily temperature, sum of temperature degrees, total sum of temperature degrees

Presentation: oral