GiESCO 2019 banner
IVES 9 IVES Conference Series 9 GiESCO 9 Different yield regulation strategies in semi-minimal-pruned hedge (SMPH) and impact on bunch architecture

Different yield regulation strategies in semi-minimal-pruned hedge (SMPH) and impact on bunch architecture

Abstract

Context and purpose of the study – Yields in the novel viticulture training system Semi-Minimal-Pruned Hedge (SMPH) are generally higher compared to the traditional Vertical Shoot Positioning (VSP). Excessive yields have a negative impact on the vine and wine quality, which can result in substantial losses in yield in subsequent vintages (alternate bearing) or penalties in fruit quality. Therefore yield regulation is essential. The bunch architecture in SMPH differs from VSP. Generally there is a higher amount but smaller bunches with lower single berry weights in SMPH compared to VSP. By means of different yield-regulating measures, i.e. biochemical thinning concepts, harvester thinning and Darwin-rotor (Fruit Tec Maschinenbau, Markdorf, Germany) the bunch architecture in SMPH is altered. A loose bunch architecture minimizes the risk of bunch rot and improves grape health. The aim of the study was to investigate the impact of different yield regulation strategies in SMPH on the bunch architecture.

Material and methods – Under field conditions, three different thinning methods were tested on the two fungus-resistant grape varieties Rondo, Regent, and additionally Riesling at Geisenheim, Germany (49°59´20” N; 7°55´56 ” E). Both biochemical and mechanical thinning concepts were pursued. The biochemical grape thinning treatment was applied during flowering with the plant growth regulator gibberellic acid (Gibb3; Plantan GmbH, Buchholz, Germany). The mechanical thinning was performed using a harvester at berry pea size stage of fruit development and the Darwin-rotor, which was originally developed for horticultural crops and commonly used for mechanical blossom thinning by horizontally rotating strings. In the vineyard it has been used for thinning young canes a week after budburst (E-L-scale: 9). The three thinning treatments were compared to non-treated VSP and SMPH control and bunch architecture has been investigated.

Results – Lower bunch weight, berry weight and rachis weight were detected in all SMPH treatments compared to VSP. Statistically significant lower bunch weight was detected for SMPH using harvester thinning compared to SMPH thinning with gibberellic acid, thinning with Darwin-rotor and a non-treated SMPH control. No differences in rachis weight were observed between the SMPH treatments. Our results indicate a looser bunch architecture using a harvester and gibberellic acid for yield regulation compared to a non-treated SMPH control. Whereas thinning with the Darwin-rotor resulted in an increase of berry diameter and bunch weight hence more compact bunches.

DOI:

Publication date: September 29, 2023

Issue: GiESCO 2019

Type: Poster

Authors

Jan SCHÄFER*, Matthias FRIEDEL and Manfred STOLL

Hochschule Geisenheim University, Von-Lade-Str. 1, D-65366 Geisenheim, Germany

Contact the author

Keywords

Semi-Minimal-Pruned Hedge (SMPH), yield regulation, thinning, bunch architecture, Darwin-rotor, gibberellic acid

Tags

GiESCO | GiESCO 2019 | IVES Conference Series

Citation

Related articles…

Chemical profiling and sensory analysis of wines from resistant hybrid grape cultivars vs conventional wines

Recently, there has been a shift toward sustainable wine production, according to EU policy (F2F and Green Deal), to reduce pesticide usage, improve workplace health and safety, and prevent the impacts of climate change. These trends have gained the interest of consumers and winemakers. The cultivation of disease resistant hybrid grape cultivars (DRHGC), known as ‘PIWI’ grapes can help with these objectives [1]. This study aimed to profile white and red wines produced from DRHGC in South Tyrol (Italy). Wines produced from DRHGCs were compared with conventional wines produced by the same wineries. The measured parameters were residual sugars, organic acids, alcohol content, pigments and other phenolics by LC-QqQ/MS, colorimetric indexes (CIELab); and volatile profiles (HS-SPME-GCxGC-ToF/MS [2]).

Influenza delle componenti climatiche e pedologiche sulla variabilità dei contenuti polifenolici in alcuni ambienti vitati della DOCG Sagrantino di Montefalco

Obiettivo del progetto è la valutazione dell’influenza climatica e pedologica dell’areale di Montefalco sul vitigno Sagrantino, ponendo particolare attenzione alla componente polifenolica e antocianica. Sono stati quindi messi a confronto, a partire dal 2001 fino al 2008, sei differenti zone tutte situate all’interno dell’areale DOCG Sagrantino di Montefalco; per ciascun vigneto alla vendemmia sono state effettuate analisi sui parametri analitici e sul contenuto polifenolico e antocianico delle uve. Ognuna delle sei zone è inoltre stata caratterizzata dal punto di vista pedoclimatico, valutando l’influenza del clima e della tipologia di suolo sui parametri analitici presi in considerazione.

Multisensory experiential wine marketing

Interest in the pairing, or matching, of wine with music goes way back, with commentators initially using musical metaphors merely to describe the wines that they were writing about. More recently, however, this has transformed into a growing range of multisensory tasting events in which wine and music are deliberately paired to assess, or increasingly to illustrate, the impact of the latter on

USE OF 13C CP/MAS NMR AND EPR SPECTROSCOPIC TECHNIQUES TO CHARACTERIZE MACROMOLECULAR CHANGES IN OAK WOOD(QUERCUS PETRAEA) DURING TOASTING

For coopers, toasting process is considered a crucial step in barrel production during which oak wood (Q. petraea) develops several aromatic nuances released to the wine during its maturation. Toasting consists of applying different degrees of heat to a barrel for a specific period. As the temperature increases, thermal degradation of oak wood structure produces a huge range of chemical compounds. Many studies have identified the main key aroma volatile compounds (whisky-lactone, furfural, eugenol, guaiacol, vanillin). However, detailed information on how the chemical structure of oak wood degrades with increasing toasting level is still lacking.

Impact of yeast strain and aging time on the secondary metabolites, macromolecule composition, and sensory attributes of sparkling wines elaborated by the traditional method

The occurrence of aroma and macromolecule constituents in sparkling wines, directly influencing their organoleptic characteristics, is affected by several factors, including the grape cultivar, base-wine particularities, inoculated yeasts, the aging time, and winemaking practices [1].