Agronomic behavior of three grape varieties in different planting density and irrigation treatments
In the O Ribeiro Denomination of Origin, there is a winemaking tradition of growing vines under a high-density plantation framework (8,920 vines/ha) and maintaining its vegetative cycle under rainfed conditions.
Currently, viticulture is advancing to plantation frames in which the density is considered medium (5,555 vines/ha), thus allowing mechanized work to be carried out for vineyard management operations. Although, the application of irrigation applied proportionally to the needs of the vegetative cycle of the vine, is a factor that increasingly helps a good development of the vine compared to the summer period, with increasingly uncertain weather forecasts.
For this reason, the main objective of this work is the agronomic evaluation of three grape varieties, with both planting densities (medium and high), with irrigation (deficit irrigation – 30% ETo) and rainfed treatments, with four replications (seven vines) which allow to determine possible differences in parameters of production and quality.
The plot under study is framed under the Denomination of Origin of O Ribeiro, belonging to the viticulture and oenology station of Galicia (Leiro, Ourense).
The study was carried out in the 2021 and 2022 seasons over two red varieties (Mencia and Sousón) and the most representative white variety of the region, Treixadura.
With the results obtained, it has been possible to observe significant differences performed with a statistical test ANOVA, between irrigation treatments when were evaluated the production parameters, obtaining a higher production per vine and number of clusters when irrigation is applied and when it is in the medium density plantation framework in the three grape varieties studied. Regarding the differences observed between vineyard planting frames, significant differences have been observed in Mencia and Treixadura grape varieties, favoring in both cases the medium density planting frame, with which it has been obtained a greater production of grapes with a greater number of clusters per plant.
Regarding quality parameters, density and irrigation treatments have significant differences in terms of malic acid content in the high planting density.
As conclusions, it has been possible to observe how in none of the varieties, the quality parameters are affected when the vineyard was in a plantation framework in which a mechanized an comfortable work of the vineyard is allowed, compared to the plantation framework of traditional area.
Issue: ICGWS 2023
1GI-1716-Universidad de Santiago de Compostela, Escuela Politécnica Superior de Ingeniería, Rúa Benigno Ledo s/n 27002, Lugo, España.
2Estación de Viticultura e Enoloxía de Galicia (AGACAL_EVEGA). Ponte San Clodio s/n, 32428, Leiro, Ourense (España).