Gustavo Pereyra | Universidad de la República (Uruguay) (original) (raw)
Papers by Gustavo Pereyra
Agrociencia Uruguay, Sep 5, 2023
Agrociencia Uruguay, Feb 6, 2024
Research Square (Research Square), Jun 6, 2022
The authors have requested that this preprint be removed from Research Square.
OENO One
This study aimed to determine how within-plot soil heterogeneity combined with yearly climate var... more This study aimed to determine how within-plot soil heterogeneity combined with yearly climate variability can promote the heterogeneity of vine growth at plot level, and which soil-climate parameters influence final yield and berry composition the most. An 8-year experiment was conducted on grapevine in two zones of a vineyard (1 ha) differentiated according to grapevine vigour as determined by NDVI: high vigour (HV) and low vigour (LV). The heterogeneity of the soil properties (depth, texture and composition), plant growth (shoots and roots) and plant production (yield components and berry composition) were determined at plot level. Compared to the LV zone, the HV zone was associated with deeper soils, higher soil water and nitrogen availability, CEC and montmorillonite/illite ratio. More extended root systems, higher vegetative growth and higher yield were observed in the HV zone compared to the LV zone. Drier and warmer vintages increased the difference in heterogeneity of vine g...
Agrociencia Uruguay
Soil physical and chemical characteristics play a key role on vine growth and yield. The soils of... more Soil physical and chemical characteristics play a key role on vine growth and yield. The soils of South Uruguay display high content of montmorillonite or illite. The proportion of these minerals deserves special attention as they influence the soil structure and its hydrological properties. The present study was conducted in a 1.1 ha vineyard of this region (Canelones), characterized by a high heterogeneity of plant vigour. It was aimed to determine and map the physical and chemical properties of the soil and their relations with plant vigour and yield. The cation exchange capacity (CEC) and the clay and organic matter contents were measured in 84 locations within this vineyard to calculate the montmorillonite and illite contents of the soil. In addition, the type and abundance of clays was corroborated by X-ray diffractometry analysis. The CEC and montmorillonite contents were positively correlated with vine vigour, expressed by the Normalized Vegetation Index (NDVI), trunk diamet...
The authors have requested that this preprint be removed from Research Square.
Vitis: Journal of Grapevine Research, 2020
Climate variability influence on the vine is widely studied for its impact on grape final composi... more Climate variability influence on the vine is widely studied for its impact on grape final composition and quality. During 1994-2016, thermal and water regimes and their influence on grapevine yield, sanitary status and berry composition were analyzed for 'Tannat' grown in commercial vineyards in the south of Uruguay (Lat 34° 37' S; 56° 17' W). Statistical analysis showed that the principal component analysis (PCA) separated years in three groups: Group 1: rainfall over the growing season higher than the average, limited sanitary status, acidity and yield higher than average, lower sugar content, late harvest. Group 2: greater thermal conditions and water component lower than average, better sanitary status, sugar contents and acidity lower than average, early harvest. Group 3: thermal conditions lower than average, rainfall higher during budbreak-fruitset period and lower than average in the month before harvest, berry size and sugar contents greater than average. Co...
BIO Web of Conferences, 2019
La viticultura de precisión es una herramienta performante para la gestión del vigor intra parcel... more La viticultura de precisión es una herramienta performante para la gestión del vigor intra parcelario. En una parcela de 1,1 hectáreas de un viñedo comercial de la variedad Tannat, implantado en clima sub- húmedo, en donde delimitó dos zonas de vigor (alto y bajo). Uno de los factores determinantes de dichas diferencias de vigor, sería la diferencia en el contenido de agua en el suelo. Para demostrar esta hipótesis se instalaron parcelas por cada nivel de vigor en las cuales se realizó un seguimiento del estado de hidratación de las plantas mediante el potencial hídrico foliar de base (Ψf). Se determinó la composición isotópica (δ18O) en agua de hojas y mosto. Se demostraron correlaciones significativas entre Ψf y OI. Las medidas de δ18O en hojas brindaron un dato puntual del contenido de agua, en tanto que las del mosto describieron la evolución del estado de hidratación de la planta durante el ciclo del cultivo. El δ18O podría ser una forma rápida de identificación de zonas de dif...
Precision Agriculture, 2019
The aim of this study was to assess the spatial variability of plant vigor in a vineyard in a hum... more The aim of this study was to assess the spatial variability of plant vigor in a vineyard in a humid climate. Normalised Difference Vegetation Index (NDVI) was used for relating the vigor level to grapevine performance and, as a new area, with the anthocyanin and organic acid compositions of the berries. The study was performed in a rain-fed vineyard with the Tannat cultivar, vertically trellised, during three consecutive vintages (2015-2017). NDVI was estimated from high-resolution images acquired using airborne sensors, which allowed differentiation of three vigor levels within the vineyard: high, medium and low. Three plots per vigor level were installed for performing samplings and field measurements. High vigor zones were associated with less water-stressed vines, higher yields, incidence of bunch rot, larger berries, total acidities and total anthocyanins concentrations. Low vigor zones corresponded to higher pH, soluble solids and phenolic contents in the berries. Medium vigor zones were associated with higher leaf surface, pruning weights, cluster average weights and greater extractable anthocyanins concentrations. The effect of weather conditions of each growing season on grapevine water status was a major factor influencing the analysed variables. NDVI values allowed for delineating areas with homogeneous vigor within the vineyard, which corresponded with different plant performance, showing the usefulness of this tool for site-specific management under the studied conditions.
HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.
OENO One
The spatial variability of vineyards can be characterised through precision viticulture that will... more The spatial variability of vineyards can be characterised through precision viticulture that will allow setting the boundaries of homogeneous management zones. This study aimed to evaluate the impact of soil and plant management (site-specific management) to increase yields and improve berry quality. During three consecutive seasons, contrasting treatments designed ad hoc for two zones of vigour pre-established by NDVI were tested: high vigour zone (HV) and low vigour zone (LV). The treatments were aimed at reducing water and nitrogen supply and improving microclimatic conditions in the cluster zone in the HV zone. In the LV zone, treatments were aimed at increasing water and nitrogen supply. Leaf removal in the HV zone was the most efficient treatment to improve productivity and quality. Moreover, the water restriction improved grape quality, especially in a rainy year. The regulated deficit irrigation strategy applied in the LV zone at specific phenological stages was shown to inc...
Montmorillonite content is an influential soil parameter of grapevine development and yield in So... more Montmorillonite content is an influential soil parameter of grapevine development and yield in South Uruguay El contenido de montmorillonita es un parámetro de suelo influyente en el desarrollo y rendimiento de la vid en el sur de Uruguay O teor de montmorilonite é um parâmetro influente do desenvolvimento e rendimento da videira no Sul do Uruguai
This article is published under the Creative Commons licence (CC BY 4.0).
E3S Web of Conferences, 2018
El clima vitícola, un componente mayor del Terroir, fue identificado en la región sur del Uruguay... more El clima vitícola, un componente mayor del Terroir, fue identificado en la región sur del Uruguay: sequía moderada, templado cálido, noches templadas, sometido a la influencia de la brisa marina. En el período 1994-2016, se analizó el régimen térmico e hídrico y su influencia sobre el rendimiento, sanidad y composición de la uva, de viñedos comerciales de Tannat. ACP mostró 3 grupos de años: Grupo 1 (húmedo), precipitaciones del ciclo del cultivo superiores a la media, sanidad limitante, acidez y rendimiento mayores a la media y azúcares inferiores, cosechas tardías. Grupo 2 (cálido y seco), condiciones térmicas superiores al promedio y la componente hídrica por debajo, sanidad superior a la media, azúcares y acidez inferiores, cosechas adelantadas. Grupo 3 (fresco, húmedo en primavera y seco en maduración), condiciones térmicas inferiores a la media, precipitaciones superiores a la media en brotación –cuajado e inferiores en el mes previo a cosecha, superiores a la media azúcares y...
National audienceDu fait de la croissance démographique et du changement climatique, le bassin mé... more National audienceDu fait de la croissance démographique et du changement climatique, le bassin méditerranéen est soumis à une forte pression concernant l’accès aux ressources en eau, qui pourrait atteindre un seuil critique avec l’augmentation de la demande et la diminution de la disponibilité de ces ressources. Quel que soit son usage, l’eau a une valeur incontestable. Cependant, la réutilisation des eaux traitées comme source d’eau alternative, reconnue internationalement depuis plusieurs décennies, n’est que peu développée et mise en œuvre en France. Irri-Alt’Eau (projet R&D collaboratif régional, région Occitanie) est la première « Plateforme expérimentale et pédagogique de terrain » en France, sur la réutilisation des eaux traitées pour l’irrigation par goutte-à-goutte de la vigne en quantité et qualité maîtrisées. Ce projet est mené par un partenariat « Entreprise-Recherche-Collectivité » (Veolia, Aquadoc, Cave Coopérative de Gruissan, INRA UEPR et LBE , l’Agglomération du Grand Narbonne) avec l’objectif de développer une pratique raisonnée, compétitive, scientifiquement étayée et durable, de l’irrigation de la vigne avec des eaux traitées de qualité physico-chimique et microbiologique maîtrisée
Agrociencia Uruguay, Sep 5, 2023
Agrociencia Uruguay, Feb 6, 2024
Research Square (Research Square), Jun 6, 2022
The authors have requested that this preprint be removed from Research Square.
OENO One
This study aimed to determine how within-plot soil heterogeneity combined with yearly climate var... more This study aimed to determine how within-plot soil heterogeneity combined with yearly climate variability can promote the heterogeneity of vine growth at plot level, and which soil-climate parameters influence final yield and berry composition the most. An 8-year experiment was conducted on grapevine in two zones of a vineyard (1 ha) differentiated according to grapevine vigour as determined by NDVI: high vigour (HV) and low vigour (LV). The heterogeneity of the soil properties (depth, texture and composition), plant growth (shoots and roots) and plant production (yield components and berry composition) were determined at plot level. Compared to the LV zone, the HV zone was associated with deeper soils, higher soil water and nitrogen availability, CEC and montmorillonite/illite ratio. More extended root systems, higher vegetative growth and higher yield were observed in the HV zone compared to the LV zone. Drier and warmer vintages increased the difference in heterogeneity of vine g...
Agrociencia Uruguay
Soil physical and chemical characteristics play a key role on vine growth and yield. The soils of... more Soil physical and chemical characteristics play a key role on vine growth and yield. The soils of South Uruguay display high content of montmorillonite or illite. The proportion of these minerals deserves special attention as they influence the soil structure and its hydrological properties. The present study was conducted in a 1.1 ha vineyard of this region (Canelones), characterized by a high heterogeneity of plant vigour. It was aimed to determine and map the physical and chemical properties of the soil and their relations with plant vigour and yield. The cation exchange capacity (CEC) and the clay and organic matter contents were measured in 84 locations within this vineyard to calculate the montmorillonite and illite contents of the soil. In addition, the type and abundance of clays was corroborated by X-ray diffractometry analysis. The CEC and montmorillonite contents were positively correlated with vine vigour, expressed by the Normalized Vegetation Index (NDVI), trunk diamet...
The authors have requested that this preprint be removed from Research Square.
Vitis: Journal of Grapevine Research, 2020
Climate variability influence on the vine is widely studied for its impact on grape final composi... more Climate variability influence on the vine is widely studied for its impact on grape final composition and quality. During 1994-2016, thermal and water regimes and their influence on grapevine yield, sanitary status and berry composition were analyzed for 'Tannat' grown in commercial vineyards in the south of Uruguay (Lat 34° 37' S; 56° 17' W). Statistical analysis showed that the principal component analysis (PCA) separated years in three groups: Group 1: rainfall over the growing season higher than the average, limited sanitary status, acidity and yield higher than average, lower sugar content, late harvest. Group 2: greater thermal conditions and water component lower than average, better sanitary status, sugar contents and acidity lower than average, early harvest. Group 3: thermal conditions lower than average, rainfall higher during budbreak-fruitset period and lower than average in the month before harvest, berry size and sugar contents greater than average. Co...
BIO Web of Conferences, 2019
La viticultura de precisión es una herramienta performante para la gestión del vigor intra parcel... more La viticultura de precisión es una herramienta performante para la gestión del vigor intra parcelario. En una parcela de 1,1 hectáreas de un viñedo comercial de la variedad Tannat, implantado en clima sub- húmedo, en donde delimitó dos zonas de vigor (alto y bajo). Uno de los factores determinantes de dichas diferencias de vigor, sería la diferencia en el contenido de agua en el suelo. Para demostrar esta hipótesis se instalaron parcelas por cada nivel de vigor en las cuales se realizó un seguimiento del estado de hidratación de las plantas mediante el potencial hídrico foliar de base (Ψf). Se determinó la composición isotópica (δ18O) en agua de hojas y mosto. Se demostraron correlaciones significativas entre Ψf y OI. Las medidas de δ18O en hojas brindaron un dato puntual del contenido de agua, en tanto que las del mosto describieron la evolución del estado de hidratación de la planta durante el ciclo del cultivo. El δ18O podría ser una forma rápida de identificación de zonas de dif...
Precision Agriculture, 2019
The aim of this study was to assess the spatial variability of plant vigor in a vineyard in a hum... more The aim of this study was to assess the spatial variability of plant vigor in a vineyard in a humid climate. Normalised Difference Vegetation Index (NDVI) was used for relating the vigor level to grapevine performance and, as a new area, with the anthocyanin and organic acid compositions of the berries. The study was performed in a rain-fed vineyard with the Tannat cultivar, vertically trellised, during three consecutive vintages (2015-2017). NDVI was estimated from high-resolution images acquired using airborne sensors, which allowed differentiation of three vigor levels within the vineyard: high, medium and low. Three plots per vigor level were installed for performing samplings and field measurements. High vigor zones were associated with less water-stressed vines, higher yields, incidence of bunch rot, larger berries, total acidities and total anthocyanins concentrations. Low vigor zones corresponded to higher pH, soluble solids and phenolic contents in the berries. Medium vigor zones were associated with higher leaf surface, pruning weights, cluster average weights and greater extractable anthocyanins concentrations. The effect of weather conditions of each growing season on grapevine water status was a major factor influencing the analysed variables. NDVI values allowed for delineating areas with homogeneous vigor within the vineyard, which corresponded with different plant performance, showing the usefulness of this tool for site-specific management under the studied conditions.
HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.
OENO One
The spatial variability of vineyards can be characterised through precision viticulture that will... more The spatial variability of vineyards can be characterised through precision viticulture that will allow setting the boundaries of homogeneous management zones. This study aimed to evaluate the impact of soil and plant management (site-specific management) to increase yields and improve berry quality. During three consecutive seasons, contrasting treatments designed ad hoc for two zones of vigour pre-established by NDVI were tested: high vigour zone (HV) and low vigour zone (LV). The treatments were aimed at reducing water and nitrogen supply and improving microclimatic conditions in the cluster zone in the HV zone. In the LV zone, treatments were aimed at increasing water and nitrogen supply. Leaf removal in the HV zone was the most efficient treatment to improve productivity and quality. Moreover, the water restriction improved grape quality, especially in a rainy year. The regulated deficit irrigation strategy applied in the LV zone at specific phenological stages was shown to inc...
Montmorillonite content is an influential soil parameter of grapevine development and yield in So... more Montmorillonite content is an influential soil parameter of grapevine development and yield in South Uruguay El contenido de montmorillonita es un parámetro de suelo influyente en el desarrollo y rendimiento de la vid en el sur de Uruguay O teor de montmorilonite é um parâmetro influente do desenvolvimento e rendimento da videira no Sul do Uruguai
This article is published under the Creative Commons licence (CC BY 4.0).
E3S Web of Conferences, 2018
El clima vitícola, un componente mayor del Terroir, fue identificado en la región sur del Uruguay... more El clima vitícola, un componente mayor del Terroir, fue identificado en la región sur del Uruguay: sequía moderada, templado cálido, noches templadas, sometido a la influencia de la brisa marina. En el período 1994-2016, se analizó el régimen térmico e hídrico y su influencia sobre el rendimiento, sanidad y composición de la uva, de viñedos comerciales de Tannat. ACP mostró 3 grupos de años: Grupo 1 (húmedo), precipitaciones del ciclo del cultivo superiores a la media, sanidad limitante, acidez y rendimiento mayores a la media y azúcares inferiores, cosechas tardías. Grupo 2 (cálido y seco), condiciones térmicas superiores al promedio y la componente hídrica por debajo, sanidad superior a la media, azúcares y acidez inferiores, cosechas adelantadas. Grupo 3 (fresco, húmedo en primavera y seco en maduración), condiciones térmicas inferiores a la media, precipitaciones superiores a la media en brotación –cuajado e inferiores en el mes previo a cosecha, superiores a la media azúcares y...
National audienceDu fait de la croissance démographique et du changement climatique, le bassin mé... more National audienceDu fait de la croissance démographique et du changement climatique, le bassin méditerranéen est soumis à une forte pression concernant l’accès aux ressources en eau, qui pourrait atteindre un seuil critique avec l’augmentation de la demande et la diminution de la disponibilité de ces ressources. Quel que soit son usage, l’eau a une valeur incontestable. Cependant, la réutilisation des eaux traitées comme source d’eau alternative, reconnue internationalement depuis plusieurs décennies, n’est que peu développée et mise en œuvre en France. Irri-Alt’Eau (projet R&D collaboratif régional, région Occitanie) est la première « Plateforme expérimentale et pédagogique de terrain » en France, sur la réutilisation des eaux traitées pour l’irrigation par goutte-à-goutte de la vigne en quantité et qualité maîtrisées. Ce projet est mené par un partenariat « Entreprise-Recherche-Collectivité » (Veolia, Aquadoc, Cave Coopérative de Gruissan, INRA UEPR et LBE , l’Agglomération du Grand Narbonne) avec l’objectif de développer une pratique raisonnée, compétitive, scientifiquement étayée et durable, de l’irrigation de la vigne avec des eaux traitées de qualité physico-chimique et microbiologique maîtrisée