Enter user name and password:


VitiSynth Full Entry

Reference: High Planting Density Reduces Productivity and Quality of Mechanized Concord Juice Grapes
Key Statements


The choice of planting density is a key decision with long-term implications for grape growers to make before vineyard establishment. The field trial with drip-irrigated, machine-pruned Concord juice grapes described here tested the effects on yield formation and fruit composition of two between-row distances (2.44 m and 2.74 m) and four within-row distances (0.91 m, 1.83 m, 2.74 m, and 3.66 m), resulting in planting densities ranging from 997 to 4485 vines/ha. Canopy size, yield components, and fruit composition were measured over 6 years, starting in year 3 after planting. Whereas in the first cropping season the yield at 0.91 m and 1.83 m vine spacing (11.8 t/ha) was twice that at 2.74 m and 3.66 m (5.6 t/ha), on average over the 5 subsequent years the yield of 0.91-m vines was 38% lower (18.2 t/ha) than that at the other planting distances (29.2 t/ha). During the last 4 years, the average yield of vines planted at 2.44 m between rows was 2 t/ha higher than that at 2.74 m. The yield potential and fruit quality of closely spaced vines (0.91 m) was compromised by their vigorous growth, high canopy density, and poor microclimate, which resulted in fewer clusters/vine, fewer berries/cluster, lower cluster weights, and more bunch-stem necrosis. Leaf death in the canopy interior was associated with nutrient remobilization and high potassium and pH in the juice from 0.91-m vines. Juice total soluble solids, titratable acidity, and color remained unaffected by planting density. These results show that planting juice grapes at high density in irrigated and highly mechanized vineyards is detrimental to both cropping potential and fruit quality.

(highlighting by VitiSynth)

Link to paper-


DOI: 10.5344/ajev.2021.21014

Partially indexed reference.

View Interactions

VitiSynth Review
Go Back


Publication Details

Published: 2021
Publication: AJEV
Issue: 2021 Online August 2021
Author: Keller M 2021

Must Read

Related Video

None for this Entry

Related Audio

None for this Entry

Discuss this Entry

No related discussions available.

Join Discussion

Latest Discussions
Special Report

Date: 19th April 2020
Vine Synth:Growth stage:VS 4 Flowering:VS 4c Bud development:VS 4c.2 Differentiation of main axis of anlage into inflorescence rachis primordium or tendril primordium

The development of inflorescence primordia (IP) is clearly described i...Read more

Date: 16th February 2020
Admin Synth:Guides:Data standards:Colour codes

I think it would be very useful if we have standard colour codes for e...Read more

Date: 29th October 2015
Reference:Journal:Weed Technology:2015:Online October 2015:Devkota P 2015:Influence of Spray Solution Temperature and Holding Duration on Weed Control with Premixed Glyphosate and Dicamba Formulation

Pesticides in general are chemical products, therefore the quality of ...Read more

List of sponsors.. Read more