scholarly journals Observations on the influence of vine covering by means of a transparent plastic sheet on berry ripening and wine quality (Saint-Emilion, 1995 and 1996)

OENO One ◽  
1998 ◽  
Vol 32 (3) ◽  
pp. 129
Author(s):  
Cornelis Van Leeuwen ◽  
Ph. Guigal ◽  
Philippe Pieri
Keyword(s):  
Water Status ◽  
Heavy Rain ◽  
Frost Damage ◽  
Control Plot ◽  
Wine Quality ◽  
Transparent Plastic ◽  
Plastic Sheet ◽  
Spring Frost ◽  
Berry Ripening

<p style="text-align: justify;">Given the climat of the Bordeaux area, major climatic accidents can affect both the yield and the quality of the crop. Spring frost can destroy the future harvest, as happened in 1977 and 1991. Heavy rain in September can compromise a promising grape potential, evaluated at the end of August, and cause major <em>Botrytis</em> problems, as happened in 1963, 1965, 1968, and, more recently, in 1993. In this paper we discuss how soil and vine covering can contribute to avoid these problems. Vine covering, by means of a transparent plastic sheet, was experimented with in 1995 and 1996, between the end of March and early May, to reduce frost harm. In September of the same years, at the end of the ripening period, we studied the influence of soil covering (mentionned "BS") as well as soil and vine covering (mentionned as « BT ») on water status of the vines, microclimate, berry ripening and wine quality.</p><p style="text-align: justify;">In 1996, 14 p. cent of the buds were frozen in the control plot. No frost damage was noted underneath the plastic cover. In the same year, when most of our observations were made, supranormal rainfall in August preceeded the second period of soil and vine covering, carried out on 27th August. Under these conditions, we did not mesure any difference in vine water status until the harvest on the three plots. Microclimate was warmer and drier on the covered plots, especially underneath the over-vine cover.</p><p style="text-align: justify;">On the covered plots, yields were higher. In 1996, on BT, the vines carried more bunches, the bunches carried more berries and berry weight was higher. The control vines were significantly more affected by <em>Botrytis</em> compared to BS ; BT showed almost no rot. Berries on the covered plots showed a tendancy of having more sugar and total phenolics, and less malic acid. Separate microvinifications were done with 50 kg of grapes from each plot. Wine from BT was preferred over BS. Wine from the control plot was the least appreciated.</p>

scholarly journals The influence of water stress on plant hydraulics, gas exchange, berry composition and quality of Pinot Noir wines in Switzerland

OENO One ◽  
2017 ◽  
Vol 51 (1) ◽  
Author(s):  
Vivian Zufferey ◽  
Jean-Laurent Spring ◽  
Thibaut Verdenal ◽  
Agnès Dienes ◽  
Sandrine Belcher ◽  
...  
Keyword(s):  
Water Stress ◽  
Gas Exchange ◽  
Leaf Gas Exchange ◽  
Water Status ◽  
Growing Season ◽  
Pinot Noir ◽  
Wine Quality ◽  
Plant Hydraulics ◽  
Berry Composition

<p><strong>Aims : </strong>The aims of this study were to investigate the physiological behavior (plant hydraulics, gas exchange) of the cultivar Pinot Noir in the field under progressively increasing conditions of water stress and analyze the effects of drought on grape and wine quality.</p><p><strong>Methods and results : </strong>Grapevines of the variety <em>Vitis vinifera</em> L. cv. Pinot Noir (clone 9-18, grafted onto 5BB) were subjected to different water regimes (irrigation treatments) over the growing season. Physiological indicators were used to monitor plant water status (leaf and stem water potentials and relative carbon isotope composition (d<sup>13</sup>C) in must sugars). Leaf gas exchange (net photosynthesis A and transpiration E), leaf stomatal conductance (gs), specific hydraulic conductivity in petioles (K<sub>petiole</sub>), yield components, berry composition at harvest, and organoleptic quality of wines were analyzed over a 7-year period, between 2009 and 2015, under relatively dry conditions in the canton of Wallis, Switzerland. A progressively increasing water deficit, observed throughout the season, reduced the leaf gas exchange (A and E) and gs in non-irrigated vines. The intrinsic water use efficiency (WUE<sub>i</sub>, A/gs) increased during the growing season and was greater in water-stressed vines than in well-watered vines (irrigated vines). This rise in WUE<sub>i</sub> was correlated with an increase in d<sup>13</sup>C in must sugars at harvest. Drought led to decreases in K<sub>petiole</sub>, E and sap flow in stems. A decrease in vine plant vigor was observed in vines that had been subjected to water deficits year after year. Moderate water stress during ripening favored sugar accumulation in berries and caused a reduction in total acidic and malic contents in must and available nitrogen content (YAN). Wines produced from water-stressed vines had a deeper color and were richer in anthocyanins and phenol compounds compared with wines from well-watered vines with no water stress. The vine water status greatly influenced the organoleptic quality of the resulting wines. Wines made from non-irrigated vines with a water deficit presented more structure and higher-quality tannins. They were also judged to be more full-bodied and with blended tannins than those made from irrigated vines.</p><p><strong>Conclusions : </strong>Grape ripening and resulting Pinot Noir wines were found to be largely dependent on the water supply conditions of the vines during the growing season, which influenced gas exchange and plant hydraulics.</p><p><strong>Significance and impact of the study : </strong>Plant water status constitutes a key factor in leaf gas exchange, canopy water use efficiency, berry composition and wine quality.</p>

scholarly journals Soil and Regulated Deficit Irrigation Affect Growth, Yield and Quality of ‘Nero d’Avola’ Grapes in a Semi-Arid Environment

Plants ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 641
Author(s):  
Maria Gabriella Barbagallo ◽  
Giuseppe Vesco ◽  
Rosario Di Lorenzo ◽  
Riccardo Lo Bianco ◽  
Antonino Pisciotta
Keyword(s):  
Vegetative Growth ◽  
Deficit Irrigation ◽  
Water Status ◽  
Irrigation Management ◽  
Growth Yield ◽  
Wine Quality ◽  
Regulated Deficit Irrigation ◽  
Total N ◽  
Yield And Quality

The present work studied the effect of two consecutive years of regulated deficit irrigation (RDI) compared to rain fed management on the vegetative growth, yield, and quality of ‘Nero d’Avola’ grapes. The trial was conducted separately in two soils (vertisol and entisol) located at the top and bottom hillside of the same vineyard. Vertisol was characterized by greater depth, organic matter, exchangeable K2O, and total N than entisol. RDI was based on an irrigation volume at 25% of estimated crop evapotranspiration (ETc) up to end of veraison and 10% of estimated ETc up to 15 days before harvest. Predawn water potential (PDWP) was used as indicator of plant water status and irrigation timing. No difference in irrigation management was evident between vertisol and entisol. Under Mediterranean climate conditions, RDI was able to enhance grape yield and vegetative growth, especially in vertisol, but it reduced berry titratable acidity and total anthocyanins. ‘Nero d’Avola’ showed to adapt to drought conditions in the open field. Both soil type and irrigation regimes may provide opportunities to obtain different ‘Nero d’Avola’ wine quality and boost typicality.

scholarly journals Collection of the daffodils (Narcissus × Hybridus Hort.) of the Central Botanical Garden of the National Academy of Sciences of Belarus and methodological aspects of the evaluation of its cultivars

2019 ◽  
Vol 64 (1) ◽  
pp. 18-26
Author(s):  
I. K. Volodko ◽  
L. V. Zavadskaya
Keyword(s):  
Ornamental Plants ◽  
Botanical Garden ◽  
Frost Damage ◽  
Comparative Assessment ◽  
Reproductive Capacity ◽  
Point Scale ◽  
National Academy Of Sciences ◽  
Local Conditions ◽  
Spring Frost

The collection of the daffodils of Central Botanical Garden of the NAS of Belarus unites 413 varieties representing 10 garden groups. In order to select daffodils for industrial gardening, a method for comparative assessment of cultivars has been developed, which is presented in this article.The system is based on the evaluation of cultivars of flower-ornamental plants. Cultivars of daffodils are evaluated in stages. In the period of mass flowering, a 5-points scale is used to assess the decorativeness of cultivars and their adaptability to local conditions. For further study, prospective varieties are distinguished, estimated at no lower than 4 points. They are grouped by garden groups, by color and size of flowers, flowering time, height of peduncles and practical use (group planting, cutting, forcing). In the selected groups and subgroups, a comparative assessment of promising varieties is made by of decorative and economic-biological qualities.The decorativeness of the cultivars is proposed to be assessed on a 100-point scale in total by 8 features: color, flower size, heat resistance of the flower, the quality of the perianth stems, the quality of the peduncle, the duration of flowering, abundance of flowering, originality. Each attribute is evaluated on a 5-point scale and multiplied by the coefficient of its significance, respectively, the maximum score of the attributes ranges from 10 to 15 points.The assessment of the economic and biological qualities of cultivars is carried out in total within a 50-point scale in 7 indicators: winter hardiness, spring frost damage, resistance to disease, resistance to pests, resistance to viral infection, reproductive capacity, plant condition. Coefficient of significance of all signs 1–2.Assessment of cultivars of daffodils in total for decorative and economic-biological characteristics is a key moment in the formation of the assortment of daffodils for industrial use. It allows selection of the most decorative, stable and well-breeding varieties in local conditions, estimated at not less than 130 points.

scholarly journals Grapevine responses to terroir: a global approach

OENO One ◽  
2005 ◽  
Vol 39 (4) ◽  
pp. 149 ◽  
Author(s):  
Alain Deloire ◽  
Emmanuelle Vaudour ◽  
Victoria Anne Carey ◽  
Valérie Bonnardot ◽  
Cornelis Van Leeuwen
Keyword(s):  
Water Status ◽  
Grape Berry ◽  
Laboratory Method ◽  
Global Approach ◽  
Wine Quality ◽  
Functional Aspects ◽  
Whole Plant ◽  
The Relationship ◽  
Comprehensive Study

<p style="text-align: justify;">This paper deals with the technical and/or practical treatment of terroir as a study concept, together with related functional aspects. Functioning of the terroir relies on the relation between climate, soil and vine. In addition to this interaction, a comprehensive study concept for terroir requires the consideration of viticultural and enological sciences and techniques necessary to ensure the assurance of wine quality, together with spatial aspects of the grapevine response to environmental factors, as required for vineyard management. In order to comprehend the quality of the harvest, it is necessary to understand the relationship « whole plant - berry ». An easy field and laboratory method to study the relationship between the whole plant and berry and the consequences thereof for wine quality is proposed. Knowledge of grapevine water status and the biochemical evolution within the grape berry from berry set onwards are important issues for the understanding of the role that terroir plays with respect to the quality of the harvest and the wine style or « typicality ».</p>

scholarly journals The impact of plant water status on the gas exchange, berry composition and wine quality of Chasselas grapes in Switzerland

OENO One ◽  
2018 ◽  
Vol 52 (4) ◽  
Author(s):  
Vivian Zufferey ◽  
Thibaut Verdenal ◽  
Agnès Dienes ◽  
Sandrine Belcher ◽  
Fabrice Lorenzini ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Leaf Gas Exchange ◽  
Water Status ◽  
Growing Season ◽  
Wine Quality ◽  
Plant Vigor ◽  
Water Regimes ◽  
Use Efficiency ◽  
Berry Composition

Aims: The aim of this research was to study the physiological and agronomical behaviors (leaf gas exchange, plant vigor, mineral supply, and yield components) of the Chasselas grapevine subjected to different water regimes during the growing season. The resulting grape and wine qualities were also determined.Methods and results: Adult vines of Vitis vinifera L. cv. Chasselas (clone 14/33-4, grafted onto 5BB) were subjected to different water regimes (various levels of irrigation) during the growing season. Physiological indicators were used to monitor the plant water status [the predawn leaf (. Leaf photosynthesis (A) and transpiration (E), stomatal conductance (gs), vulnerability to cavitation, yield parameters, berry composition at harvest, and organoleptic quality of wines were analyzed over a period of eight consecutive years between 2009 and 2016, under the relatively dry conditions of the Canton of Wallis, Switzerland.In non-irrigated vines, the progressively increasing water deficit observed over the season reduced the leaf gas exchange (A and E) and gs. The intrinsic water use efficiency (WUEi, A/gs) increased over the season and was greater in vines that had suffered water restriction than in irrigated vines. The rise in WUEi was correlated with an increase in d13C in the must sugars at harvest. Vulnerability to cavitation (embolism phenomenon) increased with increasing water deficit in the non-irrigated vines with covered soils. A decrease in plant vigor was observed in the vines that had been subjected to water restrictions over multiple years. Moderate water stress during fruit ripening was favorable for sugar accumulation in berries and lowered the contents of total and malic acidity in the musts and the content of available nitrogen (YAN). Overall, the organoleptic characteristics and quality of Chasselas wines were little influenced by the vine water regimes, with the exception of the hot, dry season in 2009 (and, to a lesser degree, in 2011). In those years, the quality of the wines from the irrigated vines, which had not suffered any water stress, received a better appreciation. Bitterness was generally greater in samples from the non-irrigated vineyards that had suffered from drought than in samples from the irrigated vines. No significant differences in the aroma and wine structure were measured during the study period, regardless of the vine irrigation status.Conclusions: The physiological behavior (gas exchange, plant vigor, and mineral supplies) and grape ripening in Chasselas vines were largely dependent on the water supply conditions in the vineyard during the growing season.Significance and impact of the study: Vine water status is a key factor in leaf gas exchange, canopy water use efficiency, berry composition and, lastly, wine quality.

scholarly journals Spring Frost Damage to Tea Plants Can Be Identified with Daily Minimum Air Temperatures Estimated by MODIS Land Surface Temperature Products

2021 ◽  
Vol 13 (6) ◽  
pp. 1177
Author(s):  
Peijuan Wang ◽  
Yuping Ma ◽  
Junxian Tang ◽  
Dingrong Wu ◽  
Hui Chen ◽  
...  
Keyword(s):  
Surface Temperature ◽  
Air Temperature ◽  
Land Surface Temperature ◽  
Land Surface ◽  
Frost Damage ◽  
Estimation Model ◽  
Spring Frost ◽  
Tea Plants ◽  
Elevation Model ◽  
Minimum Air Temperature

Tea (Camellia sinensis) is one of the most dominant economic plants in China and plays an important role in agricultural economic benefits. Spring tea is the most popular drink due to Chinese drinking habits. Although the global temperature is generally warming, spring frost damage (SFD) to tea plants still occurs from time to time, and severely restricts the production and quality of spring tea. Therefore, monitoring and evaluating the impact of SFD to tea plants in a timely and precise manner is a significant and urgent task for scientists and tea producers in China. The region designated as the Middle and Lower Reaches of the Yangtze River (MLRYR) in China is a major tea plantation area producing small tea leaves and low shrubs. This region was selected to study SFD to tea plants using meteorological observations and remotely sensed products. Comparative analysis between minimum air temperature (Tmin) and two MODIS nighttime land surface temperature (LST) products at six pixel-window scales was used to determine the best suitable product and spatial scale. Results showed that the LST nighttime product derived from MYD11A1 data at the 3 × 3 pixel window resolution was the best proxy for daily minimum air temperature. A Tmin estimation model was established using this dataset and digital elevation model (DEM) data, employing the standard lapse rate of air temperature with elevation. Model validation with 145,210 ground-based Tmin observations showed that the accuracy of estimated Tmin was acceptable with a relatively high coefficient of determination (R2 = 0.841), low root mean square error (RMSE = 2.15 °C) and mean absolute error (MAE = 1.66 °C), and reasonable normalized RMSE (NRMSE = 25.4%) and Nash–Sutcliffe model efficiency (EF = 0.12), with significantly improved consistency of LST and Tmin estimation. Based on the Tmin estimation model, three major cooling episodes recorded in the "Yearbook of Meteorological Disasters in China" in spring 2006 were accurately identified, and several highlighted regions in the first two cooling episodes were also precisely captured. This study confirmed that estimating Tmin based on MYD11A1 nighttime products and DEM is a useful method for monitoring and evaluating SFD to tea plants in the MLRYR. Furthermore, this method precisely identified the spatial characteristics and distribution of SFD and will therefore be helpful for taking effective preventative measures to mitigate the economic losses resulting from frost damage.

scholarly journals Effects of Different Winemaking Yeasts on the Composition of Aroma-Active Compounds and Flavor of the Fermented Jujube Wine

Processes ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 970
Author(s):  
Yan Zhao ◽  
Xiaobin Yu ◽  
Fengtao Zhu ◽  
Guangpeng Liu ◽  
Le Chu ◽  
...  
Keyword(s):  
Large Scale ◽  
Starter Cultures ◽  
Flavor Quality ◽  
Wine Quality ◽  
Active Compounds ◽  
Ethyl Hexanoate ◽  
Optimal Starter ◽  
Phenethyl Acetate ◽  
Ethyl Decanoate

For the winemaking bioprocess of jujube wine, the selection of optimal starter cultures is one of the major concerns before fermentation. In this study, we investigated the effects of different winemaking yeasts on the composition of aroma-active compounds in the fermented jujube wine and identified the principal components that determine the flavor quality. It showed that the starter winemaking yeasts produced a total of 43 aroma-active compounds, of which esters (e.g., ethyl caprylate, ethyl decanoate, ethyl hexanoate, and phenethyl acetate) contribute more to the wine quality attributes, especially for the improvement of the aroma. Moreover, the composition of aroma-active compounds, for example, the ratio of the content of esters and alcohols, exerts a great impact on the flavor quality of jujube wine. Different starter winemaking yeasts resulted in significant differences in the composition (both species and content) of aroma-active compounds, and thus formed different flavors in the jujube wine. Thus, we propose that screening of a desirable starter winemaking yeast is essential before the fermentation of jujube wine at a large scale, and more considerations should be taken into the resulting composition of aroma-active compounds.

Grape and wine quality of Vitis vinifera ‘Nero di Troia’ in response to moderate deficit irrigation

2017 ◽  
pp. 485-492 ◽  
Author(s):  
L. Tarricone ◽  
V. Alba ◽  
D. Di Gennaro ◽  
A.M. Amendolagine ◽  
G. Gentilesco ◽  
...  
Keyword(s):  
Vitis Vinifera ◽  
Deficit Irrigation ◽  
Wine Quality

scholarly journals Spring frost effects on 30 sweet cherries varieties grown in North Italy

2010 ◽  
Vol 16 (4) ◽  
Author(s):  
A. Roversi ◽  
E. Pattori ◽  
G. L. Malvicini ◽  
S. Sbaruffati
Keyword(s):  
Sweet Cherry ◽  
Frost Damage ◽  
Flowering Stage ◽  
Full Bloom ◽  
Absolute Minimum ◽  
Spring Frost ◽  
Sweet Cherries ◽  
Fruit Harvest

After a spring frost occurred in second half of March 2008, with temperatures below 0°C for 8 days consecutively and an absolute minimum of -5.5°C, a lot of observations have been made on the sweet cherry flowers damages. In three different orchards “Italian palmetta” trained on grassing ground soil, the percentage of the flowers killed by frost, was detected and recorded considering the different genotypes and flowers height from the ground. Furthermore, in one orchard only it was possible to find relationship between flowering stage and frost damage. The results clearly confirm our previous works about the highest mortality of the flower in the upper part ( > 1.50 m) of the canopy and in the full bloom open flowers. So, in this area, the easiness of agronomic operations, like pruning and, especially, fruit harvest, due to the crown proximity to the ground, is cancelled by the frequency of spring frost.

scholarly journals The effect of cooling irrigation on the blooming dynamic of plum

2010 ◽  
Vol 16 (4) ◽  
Author(s):  
L. Lakatos ◽  
I. Gonda ◽  
M. Soltész ◽  
Z. Szabó ◽  
J. Nyéki
Keyword(s):  
Relative Humidity ◽  
Frost Damage ◽  
Relative Effect ◽  
Climatic Conditions ◽  
Water Requirement ◽  
Control Plot ◽  
Logistic Curve ◽  
Treated Plot

The objective of the present study is to explore the effect of cooling irrigation (aspersion) on the beginning of bloom and on the micro-climate of the plantation. The results show that the water sprayed in the orchard by micro-jet influenced decisively the temperature of the plantation. At higher temperatures (around 20 °C), the drop of temperature may attain 5–7 °C. A low relative humidity of the air may increase the relative effect, The frequent repetition (20 minute intervals) may keep the temperature low also in the buds. The beginning of bloom may delayed for more than ten days. The dynamics of blooming was characterised by a logistic curve in the treated as well as in the control plot. In the treated plot, the curve was steeper than in the control in spite of equal temperatures measured in the plots. Under our (Hungarian) climatic conditions, the method is successfully used to delay blooming dates. The main result is the diminution of the frost damage in the spring and the security of yield. The costs and water requirement should be calculated later.

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