Published in Scientific Papers. Series A. Agronomy, Vol. LXVIII, Issue 1
Written by Ionel SAMFIRA, Nicolae Marinel HORABLAGA, Ramona Loredana TOPORAN, Adina HORABLAGA, Saida FEIER DAVID, Cristian BOSTAN
The importance of knowing the impact of life factors is also supported by several specialized studies. Several measurements were made on 34 local biotopes collected from Almajului Mountains, Mehedinți Plateau and Blahniței Plain. During the vegetation period, recording was investigated: plant height, leaf dimensions, and leaf surface of the shoot, along five BBCH development codes. Depending on the bio-accumulations of essential life factors (sum of accumulated precipitation and temperatures), biological growth was estimated. The mathematical interpretation of the slopes of the lines represents the growth rate, which practically determines the influence of precipitation or temperatures on the studied characters. The results of the research in this work show that the determining factor in the dynamics of biological growth in perennial ryegrass is the amount of precipitation. Perennial ryegrass growth in the presence of precipitation is almost double that of the accumulation of an identical amount of temperature. Moreover, studies published in related research reveal that the major limiting factors are drought and high temperatures, factors that are accentuated by current climate change.
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