Objective

To evaluate the impact of biochar-compost application on soil health, vine performance, and grape and wine quality compared to compost-only and no-application controls.

Trial Overview

The research trial focuses on evaluating the effects of biochar and compost applications under Yealands’ vines. The primary goal is to assess improvements in soil health, vine performance, and the resulting wine quality. The trial comprises three test treatments, one a control group and two with application under the vine strip to 10 vineyard rows:

1. Compost only – Applied directly under the vines, on soil surface
2. Compost and biochar blend – Compost mixed with Biochar, applied directly under the vines, on soil surface
3. No application – Control group, no compost or biochar applied

Measurements and Assessments

The trial evaluates a range of key metrics:

Vine Performance:

• Bud Numbers: Evaluation of bud development
• Inflorescence Count: Quantifying potential flower clusters per vine
• Leaf and Petiole Testing: Nutrient content analysis

Pre-Harvest Grape Metrics:

• Bunch Weight: Total weight of grape bunches
• Berry Count: Number of berries per bunch
• Berry Weight: Average weight per berry

Soil Analysis:

• Water Holding Capacity: Measuring soil’s ability to retain water
• Carbon Content: Assessing biochar’s impact on soil carbon levels
• Mineralisable Nitrogen: Availability of nitrogen for plant uptake
• Cation Exchange Capacity (CEC): Soil’s nutrient retention and availability

Juice Analysis:

• pH: Acidity level of the grape juice.
• Brix: Sugar content, indicating potential alcohol levels.
• Titratable Acidity (TA): Measurement of total acidity.

Wine Quality:

• Organoleptic Testing: Sensory evaluation of wine attributes, including aroma, flavour, and mouthfeel.

These comprehensive measurements aim to provide insights into the specific benefits of integrating biochar into vineyard management practices.