Abstract
The influence of grape variety, soil type, climatic area and year of vintage on grape composition and wine quality was studied over a six-year period with three grape varieties in a eo-operative investigation. The wines were made under carefully controlled conditions to eliminate, as far as possible, any effect of winemaking technique. All viticultural and oenological treatments were replicated so that the data could be analysed statistically. When grapes from different viticultural areas were made into table wines, the quality of the wines was most closely related to grape variety, followed by climatic area and least of all by soil type. Reproducible differences in grape and wine composition were found for the grape varieties studied. For fhe same sugar content Riesling grapes and wine contained more acidity and a higher tartaric acid/malic acid ratio than Clare Riesling grapes and wine. They also contained less nitrogen, phosphorus and potassium. Shiraz grapes were relatively high in malic acid. The year of vintage strongly influenced the tartaric acid/malic acid ratio, particularly for Riesling and Clare Riesling, and also certain other constituents. Certain years could be designated as either high or low malic acid years for a particular grape variety. The soil type influenced the amounts of certain of the constituents of grapes and wine, but had no significant effects on the wine quality. Wines from the same varieties grown on two widely different soils in the same area could not be differentiated in replicated taste tests. The soil depth, drainage and waterholding capacity appeared to be more important than composition per se. Wines made from irrigated vineyards in the warm River Murray viticultural region, contained similar amounts of tartaric and malic acids, but were higher in pH, than wines made from the same grape varieties in the cooler non-irrigated Barossa Valley. Wines from irrigated grapes were generally of somewhat lower quality than those made from grapes of the same variety grown without irrigation in a cooler area. The time of harvesting irrigated grapes appeared to be critical to achieve the necessary balance between sugar, acid and flavour. Shiraz grapes grown under irrigation contained considerably less colour than grapes of the same variety grown without irrigation. Aroma was correlated with flavour in assessing wine quality, but numerical values ascribed to these parameters did not correlate generally with the wine constituents measured. A positive correlation existed between high tasting scores and high Ball/acid ratio.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 17
Claim · model-written summary
Wine quality was most closely related to grape variety, followed by climatic area and least of all by soil type.
Verbatim
t0“grape variety, climate and soil on grape composition”
e1“When grapes from different viticultural areas were made into table wines, the quality of the wines was most closely related to grape variety, followed by climatic area and least of all by soil type”
Claim · model-written summary
Reproducible differences in grape and wine composition were found among the grape varieties studied.
Not reportedDirection
Verbatim
t0“grape variety, climate and soil on grape composition”
e1“Reproducible differences in grape and wine composition were found for the grape varieties studied”
Claim · model-written summary
Shiraz grapes were relatively high in malic acid.
Verbatim
t0“grape variety, climate and soil on grape composition”
e1“Shiraz grapes were relatively high in malic acid”
Claim · model-written summary
Year of vintage strongly influenced the tartaric acid/malic acid ratio, especially for Riesling and Clare Riesling.
Not reportedDirection
Verbatim
t0“grape variety, climate and soil on grape composition”
e1“The year of vintage strongly influenced the tartaric acid/malic acid ratio, particularly for Riesling and Clare Riesling, and also certain other constituents”
Claim · model-written summary
Certain vintage years were high or low malic acid years for a given grape variety.
Not reportedDirection
Verbatim
t0“grape variety, climate and soil on grape composition”
e1“Certain years could be designated as either high or low malic acid years for a particular grape variety”
Claim · model-written summary
Soil type influenced the amounts of certain grape and wine constituents.
Not reportedDirection
Verbatim
t0“grape variety, climate and soil on grape composition”
e1“The soil type influenced the amounts of certain of the constituents of grapes and wine, but had no significant effects on the wine quality”
Claim · model-written summary
Soil type had no significant effect on wine quality.
Verbatim
t0“grape variety, climate and soil on grape composition”
e1“The soil type influenced the amounts of certain of the constituents of grapes and wine, but had no significant effects on the wine quality”
Claim · model-written summary
Wines from the same varieties grown on two widely different soils in one area could not be differentiated in replicated taste tests.
- Taxon
- grapet0
- Material
- same varietiese1
- Outcome
- replicated taste testse1
- Setting
- two widely different soils in the same areae1
Not reportedDirection
Verbatim
t0“grape variety, climate and soil on grape composition”
e1“Wines from the same varieties grown on two widely different soils in the same area could not be differentiated in replicated taste tests”
Claim · model-written summary
Soil depth, drainage and waterholding capacity appeared more important than composition per se.
Verbatim
t0“grape variety, climate and soil on grape composition”
e1“The soil depth, drainage and waterholding capacity appeared to be more important than composition per se”
Claim · model-written summary
Wines from irrigated vineyards in the warm River Murray region had similar amounts of tartaric and malic acids to wines from the cooler non-irrigated Barossa Valley.
Verbatim
t0“grape variety, climate and soil on grape composition”
e1“Wines made from irrigated vineyards in the warm River Murray viticultural region, contained similar amounts of tartaric and malic acids, but were higher in pH, than wines made from the same grape varieties in the cooler non-irrigated Barossa Valley”
Claim · model-written summary
Wines from irrigated vineyards in the warm River Murray region had higher pH than wines from the cooler non-irrigated Barossa Valley.
Verbatim
t0“grape variety, climate and soil on grape composition”
e1“Wines made from irrigated vineyards in the warm River Murray viticultural region, contained similar amounts of tartaric and malic acids, but were higher in pH, than wines made from the same grape varieties in the cooler non-irrigated Barossa Valley”
Claim · model-written summary
Wines from irrigated grapes were somewhat lower in quality than wines from non-irrigated grapes of the same variety grown in a cooler area.
Verbatim
t0“grape variety, climate and soil on grape composition”
e1“Wines from irrigated grapes were generally of somewhat lower quality than those made from grapes of the same variety grown without irrigation in a cooler area”
Claim · model-written summary
The harvest time of irrigated grapes is critical for balancing sugar, acid and flavour.
Verbatim
t0“grape variety, climate and soil on grape composition”
e1“The time of harvesting irrigated grapes appeared to be critical to achieve the necessary balance between sugar, acid and flavour”
Claim · model-written summary
Shiraz grapes grown under irrigation had considerably less colour than those grown without irrigation.
Verbatim
t0“grape variety, climate and soil on grape composition”
e1“Shiraz grapes grown under irrigation contained considerably less colour than grapes of the same variety grown without irrigation”
Claim · model-written summary
Aroma was correlated with flavour in assessing wine quality.
Verbatim
t0“grape variety, climate and soil on grape composition”
e1“Aroma was correlated with flavour in assessing wine quality”
Claim · model-written summary
Numerical values ascribed to aroma, flavour and quality did not generally correlate with the measured wine constituents.
Verbatim
t0“grape variety, climate and soil on grape composition”
e1“but numerical values ascribed to these parameters did not correlate generally with the wine constituents measured”
Claim · model-written summary
A positive correlation existed between high tasting scores and high Ball/acid ratio.
Verbatim
t0“grape variety, climate and soil on grape composition”
e1“A positive correlation existed between high tasting scores and high Ball/acid ratio”
The same questions in other papers
irrigation · molecular: metabolites · VitisPositive and negative results
5 papers in the same direction as this paper · 11 in the opposite direction
- positive
- positive
- positive
13 papers more in this group
See all 17 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.