The Pietroasa Viticulture and Winemaking Research and Development Station is a branch of the University of Agronomic Sciences and Veterinary Medicine since 2005. It is located in the central area of the Dealu Mare vineyard, which extends over a distance of about 70 km between Teleajen Valey and Buzău Valey.
The headquarters of the resort are located in the western part of the Pietroasele village, at an altitude of 200 m, and its plantations occupy very favorable conditions for the vineyard, characteristic of the vineyard.
The field of the resort is set on a slope, with a predominantly south-facing exhibition. Its altitude varies from 130 m at the base of the slope to 350 m at its upper limit.
The soils are formed on limestone shells. The mother’s lamb is found in shallow depth, and in some portions it appears on the surface. Between soils with distinct features there can be enumerated: the skeletal-calcareous soils occupying the upper part of the slope, the skeletal colluvous soils in the middle part and the chernodomous colluvial soils and the chernozems at the base of the slope.
The soil reaction is alkaline or slightly alkaline; they have a high content of calcium carbonate, which varies between 14% in the horizon A and 20-36% in horizon B; In the C horizon the limestone mother rock often prevails.
The soils have physicochemical properties favorable to the vine culture. Thus, skeletal soils in the upper part of the slope, rich in limestone, are indicated for the cultivation of varieties for the production of sweet wines, especially of the aromatic ones, and the richest soils at the base of the slope are indicated for the mass cultivation.
The soils on the slopes with large slopes, where the mother rock appears on the surface, have been valorized by almond and walnut culture.
The climate of the Pietroasa vineyard has a temperate continental hue, presenting some peculiarities to the general climate of the vineyard. The average annual air temperature is 11.4° C, and the monthly average is negative only in January (-1.9° C). Only in some years (very special cases) the air temperature records minimum harmful to the vine culture, expressed sometimes by temperature oscillations, which can lead to eye loss during vegetative restoration of the vine.
The total amount of temperature during the growing season (April 1 – October 31) is 3,748° C, and the sum of the effective temperatures in the same period is 1,651° C. In the normal years, life begins its vegetative cycle in the first decade of April and ends it at the end of October, with a vegetation period of about 210 days. With a long vegetation period, grapes have the potential to accumulate large amounts of sugar, and the strings mature in good conditions. Due to these climatic peculiarities, the grape plantation does not bury, but it climbs, and the high and semi-high lead can be practiced without risk, especially in the middle and upper part of the slope.
The heliothermic regime is particularly favorable for the vine, the duration of sunshine totaling 2 100 hours per year, out of which 1 622 hours during the vegetation period.
The annual rainfall average is 557.7 mm, with uneven distribution throughout the year. The rainy months are May and June, and drought periods are usually recorded in February – March and July – August. Rainfall in the summer is often torrential, contributing to the erosion process, for which special works need to be done, especially in the upper part of the slope.
Sometimes torrential rains are accompanied by strong winds and hail, which can cause damage. Such calamities are rarely recorded, however, at 10-15 years, and are only occasionally recorded.
The special advantage of the Pietroasa Viticulture and Winemaking Research and Development Station within the Dealul Mare vineyard. Due to its climate and soil conditions, the Pietroasa wine-growing center is distinguished from the rest of the vineyard, benefiting from several prerequisites for wine production. Among these are, first of all, the skeletal soil with high content of calcium carbonate, formed on limestone rocks, the land exhibition, its rich heliothermal resources and the relatively poor precipitation regime.