Royo Díaz, José Bernardo
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Royo Díaz
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José Bernardo
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Agronomía, Biotecnología y Alimentación
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Publication Open Access Relevance of sink-size estimation for within-field zone delineation in vineyards(Springer, 2017) Urretavizcaya Sanz, Inés; Royo Díaz, José Bernardo; Miranda Jiménez, Carlos; Tisseyre, B.; Santesteban García, Gonzaga; Producción Agraria; Nekazaritza Ekoizpena; Gobierno de Navarra / Nafarroako Gobernua, IIM11879.RI.1Source to sink size ratio, i.e.: the relative abundance of photosynthetically active organs (leaves) with regards to photosynthate demanding organs (mainly bunches), is widely known to be one of the main drivers of grape oenological quality. However, due to the difficulty of remote sink size estimation, Precision Viticulture (PV) has been mainly based on within-field zone delineation using vegetation indices. This approach has given only moderately satisfactory results for discriminating zones with differential quality. The aim of this work was to investigate an approach to delineate within-vineyard quality zones that includes an estimator of sink size in the data-set. The study was carried out during two consecutive seasons on a 4.2 ha gobelet-trained cv. 'Tempranillo' vineyard. Zone delineation was performed using Normalized Difference Vegetation Index (NDVI), soil apparent electrical conductivity (ECa) and bunch number (BN) data. These variables were considered separately, in pairs, or the three altogether, using fuzzy k-means cluster analysis for combinations. The zones delineated based on single variables did not allow a sufficient discrimination for grape composition at harvest, NDVI being the only variable that by itself resulted in zones that to some extent differed in grape composition. On the contrary, when two variables were combined, discrimination in terms of grape composition improved remarkably, provided the sink size estimation variable (BN) was included in the combination. Lastly, the combination of the three variables yielded the best discriminating zoning, improving slightly on those provided by NDVI + BN and ECa + BN combinations. Thus, the relevance of including a variable related to sink size (in this case the number of bunches per plant) has been confirmed, which makes its consideration highly advisable for any PV work aiming at zone delineation for grape quality purposes.Publication Open Access Nitrogen isotope ratio (δ15N): a nearly unexplored indicator that provides useful information in viticulture(International Viticulture and Enology Society, 2024-05-15) Santesteban García, Gonzaga; Loidi Erviti, Maite; Urretavizcaya Sanz, Inés; Galar Martínez, Mónica; Crespo Martínez, Sara; Royo Díaz, José Bernardo; Miranda Jiménez, Carlos; Agronomía, Biotecnología y Alimentación; Agronomia, Bioteknologia eta Elikadura; Institute for Multidisciplinary Research in Applied Biology - IMAB; Gobierno de Navarra / Nafarroako GobernuaThe study of the natural abundance of nitrogen-stable isotopes is an aspect of viticulture research that has received limited attention. While stable isotopes of carbon, oxygen and hydrogen have received significant attention, nitrogen isotope ratio (S15N) 15 N) remains a less studied yet potentially informative parameter. This paper explores the implications of S15N 15 N measurements in grapevines, shedding light on its utility as an indicator for nitrogen sources, plant water status, and within-field variability. The study examines the influence of nitrogen sources, dose, and sampling organs on S15N 15 N values, revealing distinct trends in petioles, berries, and seeds. Organic fertilisers led to higher S15N 15 N values compared to inorganic sources, while increasing nitrogen doses exhibited a much weaker effect on S15N. 15 N. Moreover, S15N 15 N values vary spatially within vineyards, associating with its topography and potential soil composition, soil management and water availability. Our results highlight the importance of considering S15N 15 N in viticulture, suggesting its integration with S13C 13 C for comprehensive insights into nitrogen cycling and soil management practices. The findings advocate for further research to harness the full potential of 15 N as a valuable tool in viticultural studies.