DYNAMICS OF TMS INDICATOR UNDER INFLUENCE OF FERTILIZATION IN DACTYLIS GLOMERATA (DACGLO) PUBLISHEDFlorin Faur, Alexandru Moisuc
The dry matter content (TMS) is considered to be the best indicator of the specific growth speed (Weiher et al., 1999; Ryser, 1996) and of resource utilization (Peter et al.,1999), better than SLA. Ryser and Lambers (1995) observed that a low tissue density in Dactylis glomerata is the main character responsible for the rapid growth of this species. TMS also allows the assessment of the mean time of resource resistance in the plant (Echstein et al., 1999). Peter et al. (1999) consider that TMS is also a very practical indicator because it does not necessitate the measurement of the foliar surface.The purpose of this paper is to put in evidence the utilization way of the complex mineral fertilizers, in different areas, through TMS indicator, in species Dactylis glomerata (DACGLO), a dominant species in the permanent grassland of Poiana Braşov, where the experimental field was placed. Beyond information regarding the physiology of species and of vegetal communities, the biological characters allow the assessment of the agronomical features of the plants. The foliar biometric measurements were realized in the laboratory for a number of 10 individuals of Dactylis glomerata/plot. The obtained biological material was put in plastic glasses for re-hydration approximately 6 hours, after a preliminary sectioning of the steam basis of each plant. The plants had been pulled out by turns and after that was started the sampling of the foliar blade, the last sampled being the ligula. Further, there was determined the length (mm), the green mass (g) and the dry mass (g). In the paper we presented the analysis of some morphological features (LgL – the length of the foliar blade, MV – the green mass of the foliar blade, SU – the quantity of dry substance at foliar level) which allowed the determination of TMS indicator – indicator of the SU/MV ratio in the species Dactylis glomerata (DACGLO), dominant within the experimental field, FLD – long term fertilization – in a permanent grassland from Poiana Braşov, Romania. Analyzing the TMS indicator could be observed that it decreases in an environment with higher fertility (V6 - N 240 P 2 0 5 96 K 2 O 240) in the species DACGLO, basing on MV increasing and SU decreasing. Dactylis glomerata is a species which responds very well to fertilization, adopting a capture strategy, characterized by a lent recycling of the vegetal organs, with precocious phenology and with medium aptitudes for grazing.
Dactylis glomerata; dry matter content; green mass of the leaf blade; quantity of dry substance at foliar level; leaf blade length