Abstract:
Thermal regime of Cotnari
vineyard, Iaşi County, Romania, was
surveyed between 2011-2012 using 10
Tinytag temperature loggers TK-4014,
spread in 10 different lands of the vineyard.
Research is developed in the framework of
the international project TERVICLIM
(France), by means of was created a global
network of analyses points of vineyard
climate, spread in 13 countries from both
hemispheres of the globe, at different
latitudes. The data recorded by temperature
loggers in Cotnari vineyard shows that in
2011-2012 winter, the minimum
temperatures dropped to -28.6ºC, with
differences of up to 7.1ºC between the
coldest and the mildest lands of the
vineyard. Spatial distribution of the most
harmful frost (12 February 2012) shows that
more than 80% from the vineyard area was
exposed to temperatures lower than -24ºC,
17% to harmful temperatures between -21..-
24ºC and 3% to temperatures between -18..-
21ºC, less damaging to vines. As
consequences, the damages in the vine
plantations varied from less significant
negative consequences for vines in the
mildest location, up to massive losses of
winter buds, damages of annual branches
and frozen vines in the coldest land of the
vineyard. Analytical data of winter buds
losses spatial distribution shows that at -
28.6ºC (absolute minimum temperature for
the vineyard), 0.46% (7.29 ha) of vine
plantations were exposed to vines losses,
3.81% of plantations to losses of annual
branches, 62.49% from vine plantations to
winter buds losses exceeding 40%, difficult
to compensate by pruning, 13.5% to losses
of winter buds exceeding 60%, requiring
reestablishing the vegetative potential of
vines. The only vine plantations protected
by harmful frosts were those located at over
175 m altitude, in the highest lands of the
vineyards.
