Scientific Papers Series B Horticulture

Experimental scheme is situated in linearblocks with three variants 3 repetitions, eachrepetition with 12 stocks. Placing suchexperiences two-way 4x3 (varieties) and 2x3(clones) for each experimental year (2010-2012) was the same, taking into study twofactors, namely:Factor A - Variety, whichincludedgraduations:-a 1 Argessis;-a 2 Auriu de Stefanesti;-a 3 Moldova;-a 4 Augusta;-a 5 Perlette 10 St.-a 6 Muscat Adda 22 St-a 7 CannerFactor B - loads of fruit with differentiatedapplication of cutting bearing vineyards,which included graduations:-b 1 load of 15 eyes per vine fruit, cutting thedrill;-b 2 load of 20 eyes per vine fruit, cutting theheart;- of 25 eyes per vine fruit, cutting the string;RESULTS AND DISCUSSIONSGrape-vine buds lose their viability when thetemperature falls below -20 in winter... 22ºCfor wine varieties and below -18...-20°C at thetable (Damian et al, 2004; Dumitriu I.C., 2008).The meteorological data have been extractedfrom the database of the Stefanesti Institute,collected during the interval 1991–2010 (Figure1).Figure 1. Average temperatures (ºC) 1991-2010Grape vines can grow in the most commonareas as one of the most affected by lowtemperatures below resistance. Damage causedby winter frosts can reduce production bothquantitatively and qualitatively importanteconomic effects for both growers andwinemakers as, traders etc (Fennel A., 2004;Grecu V., 2010).Parallelism exists between the annual cycle oftemperature and annual biological cycle of thevine allowed for optimal thermal thresholds formain plant phenophases taken (Olteanu I.,2000).In order to diminish the impact of climatechange it is necessary to adapt the culturalpractices to the evolution of climate over time(Bucur M. et al, 2012).During winter quantities of starch accumulatedin strings begin to decrease and theconcentration of sugars begin to rise. Thesechanges are associated with the development offrost grape-vine. Readiness of the vine vinesfor winter can be appreciated by determiningcarbohydrate accumulated in strings.Throughout the winter synthesize starch thusincreasing the concentration of sugars in string,which is used as a barrier against injury causedby frost. Towards the end of winter there is areverse conversion of carbohydrates so that willhave high concentrations of starch and sugarsdecrease (Bennett J.S., 2002; Georgescu M etal., 1986; Matei P. et al., 2009).Table 1. Report wood / marrow and starch concentrationin the string, the varieties studied (average 2010-2012)Report StarchVarietiesVersionwood/marrow %V 1 0,27 4,3ArgessisV 2 0,25 4,1V 3 0,24 4,0Auriu de StefanestiV 1 0,25 5,2V 2 0,27 5,4V 3 0,23 5,8V 1 0,33 5,7MoldovaV 2 0,30 6,1V 3 0,31 6,3V 1 0,37 5,2Augusta (control) V 2 0,38 5,4V 3 0,35 5,0Dates on the ratio of the diameter of thewood/marrow and shows a correlation betweenthe size of the report and frost resistance of thevarieties studied. Thus the variety Moldova thereport was on average 0.31, the variety Augustaof 0.37 while Argessis and Golden Stefanesti38