Vineyard management practices to reduce sugar content on ‘Monastrell’ grapes
Climate change is resulting in more dry and hot summers, accelerating grape ripening and increasing berry sugars concentration. This results in wines with a higher alcohol content, which has a negative impact on wine quality, as well as, on consumer health. Agronomic practices that minimize these effects on berry composition and, consequently, on wine quality must be defined. In this work, different management practices have been assessed on rainfed ‘Monastrell’ grapevines in Jumilla (Murcia, Spain) from 2021 to 2023 vintages. Mulching, shading, application of kaolin and different types of pruning were evaluated, among others field adaptation practices.
Fig 1. Management practices applied, (A) shading, (B) kaolin and (C) mulching.
Results showed interesting patterns regarding grape juice composition. Thereby, shading increased the anthocyanin content and its ratio vs. total soluble solids (TSS). Tying up the shoots at the top reduced grape dehydration and the accumulation of TSS, similarly to the effect of shoot hedging. In contrast, soil mulching and kaolin applications had no effect on the TSS content compared to the control.
Acknowledgements: The authors would like to acknowledge Bodegas Juan Gil (Jumilla, Murcia, Spain) for their financial support and for supplying the experimental vineyards and Funding received from AEI-FEDER project PID2021-123305OB-C31.
Issue: ICGWS 2023
1Department of Ecology, Desertification Research Centre (CIDE-CSIC-UV-GV), Moncada, 46113 Valencia, Spain
2Centro para el Desarrollo de la Agricultura Sostenible, Instituto Valenciano de Investigaciones Agrarias (IVIA), 46113 Moncada, Valencia, Spain