BIENNIAL STUDY OF SEED PRODUCTION IN A HILLY ARRHENATHERION MEADOW

This paper analyzes the seeds production of the second cut of a hilly arrhenatherion in Pianari place in the town of Marostica (Vi). The year under review is 2010. The datas obtained are compared with datas from other studies carried out on three cuts of the same field, the first cut of the same year and the first and second cut of the previous year, 2009. The comparisons have focused primarily on the study of phenology and identified of regressions used to the seeds production estimate. With regard to the regressions that estimating the production of seed, for each species was calculated a mean regression computed with the data of the 4 cuts, so you can find as much as possible a general formula and released by annual climate trends. The results of the estimate seeds production obtained on the basis of the mean regression, were compared with those specific regressions identified cut for cut. Another purpose of the comparisons between the different cuts was the study of individual species, identifying which of them have during the time more constants productions regard of other species, or understand by what parameters are more influenced the change in seeds production for each species. Finally, phenological analysis datas, were crossed with those obtained from the total seed production, with the aim of identifying the most appropriate method to define the optimal timing of harvest. In this regard we resorted to the parameters as thermal sum, that used with phenological analysis, allows to release the carried out analysis from the specific weather conditions patterns of the years studied.