Abstract
The purpose of the study is to analyze the patterns of long-term and seasonal dynamics of the content of sugars and titratable acids in grapes using the example of the Don aboriginal variety Varyushkin. The study was carried out on the Don ampelographic collection named after Ya.I. Potapenko (Novocherkassk, Rostov Region) in 2006–2021. The sugar content and titratable acidity of the berries were determined; analyzes were made 2–4 times per season. The study was carried out using methods generally accepted in viticulture and GOSTs. Trends and agro-climatic dependencies were assessed by methods of correlation and regression analysis. In recent decades, in the Lower Don Region, there has been an increase in temperatures, a decrease in precipitation and a hydrothermal coefficient (HTC). On average, over 16 years of study during the period of technological maturity, the sugar content of berries in the Varyushkin variety was 22.0 g/100 cm3 (variation coefficient 6.6 %), titratable acidity – 7.7 g/dm3 (variation coefficient 15.3 %). Conditions of grapes at the stage of technical maturity did not have significant trends. The main agro-climatic factor of conditions turned out to be HTC for the period with temperatures above 5 °C (HTC5), with a decrease in HTC5 per unit, sugar content increased by 4.5 g/100 cm3, and acidity decreased by 3.7 g/dm3. An analysis of seasonal dynamics revealed that, on average, the growth rate of sugar content was 0.080 g/100 cm3/day, and the rate of acidity decrease was 0.043 g/dm3/day. The growth rate of sugar content increased in years with a shorter period from the beginning of ripening to full maturity of the berries. Climate change is still neutral for grape conditions.
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Claims 11
Claim · model-written summary
Sugar content of Varyushkin berries averaged 22.0 g/100 cm3 at technological maturity.
Verbatim
t0“GRAPE VARIETY VARYUSHKIN”
e0“On average, over 16 years of study during the period of technological maturity, the sugar content of berries in the Varyushkin variety was 22.0 g/100 cm3 (variation coefficient 6.6 %)”
Claim · model-written summary
Titratable acidity of Varyushkin berries averaged 7.7 g/dm3 at technological maturity.
Verbatim
t0“GRAPE VARIETY VARYUSHKIN”
e0“the sugar content of berries in the Varyushkin variety was 22.0 g/100 cm3”
e1“titratable acidity – 7.7 g/dm3 (variation coefficient 15.3 %)”
Claim · model-written summary
Grape conditions at technical maturity showed no significant trends.
Verbatim
t0“GRAPE VARIETY VARYUSHKIN”
e2“Conditions of grapes at the stage of technical maturity did not have significant trends”
Claim · model-written summary
A decrease in HTC5 per unit was associated with a 4.5 g/100 cm3 increase in sugar content.
Verbatim
t0“GRAPE VARIETY VARYUSHKIN”
e1“with a decrease in HTC5 per unit, sugar content increased by 4.5 g/100 cm3”
Claim · model-written summary
A decrease in HTC5 per unit was associated with a 3.7 g/dm3 decrease in acidity.
Verbatim
t0“GRAPE VARIETY VARYUSHKIN”
e1“with a decrease in HTC5 per unit, sugar content increased by 4.5 g/100 cm3”
e2“and acidity decreased by 3.7 g/dm3”
Claim · model-written summary
Sugar content grew at 0.080 g/100 cm3 per day during seasonal ripening.
Verbatim
t0“GRAPE VARIETY VARYUSHKIN”
e4“the growth rate of sugar content was 0.080 g/100 cm3/day”
Claim · model-written summary
Acidity decreased at 0.043 g/dm3 per day during seasonal ripening.
Verbatim
t0“GRAPE VARIETY VARYUSHKIN”
e5“the rate of acidity decrease was 0.043 g/dm3/day”
Claim · model-written summary
Sugar content grew faster in years with a shorter period from the beginning of ripening to full maturity of berries.
Verbatim
t0“GRAPE VARIETY VARYUSHKIN”
e6“The growth rate of sugar content increased in years with a shorter period from the beginning of ripening to full maturity of the berries”
Claim · model-written summary
Climate change was neutral for grape conditions.
Verbatim
t0“GRAPE VARIETY VARYUSHKIN”
e7“Climate change is still neutral for grape conditions”
Claim · model-written summary
Temperatures in the Lower Don Region increased in recent decades.
Verbatim
t0“GRAPE VARIETY VARYUSHKIN”
e1“In recent decades, in the Lower Don Region”
e2“there has been an increase in temperatures”
Claim · model-written summary
Precipitation and the hydrothermal coefficient decreased in recent decades in the Lower Don Region.
Verbatim
t0“GRAPE VARIETY VARYUSHKIN”
e1“In recent decades, in the Lower Don Region”
e2“a decrease in precipitation and a hydrothermal coefficient (HTC)”