Growing better pinot noir – Study Design

• Introduction
• Background
• Study Design
• Data Collection
• Analysis
• Data
• Glossary

Variables measured on the vine

• Trunk diameter
• Grapevine growth stage (See Data page for stage definitions)

Variables measured from the soil samples

• Dry weight of 1 gram of fresh soil
• Weight of active bacteria (micrograms per 1 gram of soil)
• Weight of active fungi (micrograms per 1 gram of soil)
• Ratio of calcium to magnesium
• soil pH (in calcium chloride solution)
• Soil chloride (milligrams per 1 kilogram of soil)
• Soil phosphorus (milligrams per 1 kilogram of soil)

• Soil potassium (milligrams per 1 kilogram of soil)
• Soluble calcium (milliequivalents per 1 kilogram of soil)
• Soluble magnesium (milliequivalents per 1 kilogram of soil)
• Soluble potassium (milliequivalents per 1 kilogram of soil)
• Soluble sodium (milliequivalents per 1 kilogram of soil)

Variables measured from the petiole samples

• Calcium content (as a percentage of the dry matter of the stalk sample)
• Magnesium content (as a percentage of the dry matter of the stalk sample)
• Potassium content (as a percentage of the dry matter of the stalk sample)
• Sodium content (as a percentage of the dry matter of the stalk sample)

Variables measured from harvested grapes & vines

• Number of bunches harvested
• Weight of bunches harvested (kg)
• Weight of material removed at pruning (kg)
• pH of juice at crushing
• Titration of tartaric acid (to a pH of 8.2 in grams per litre)
• Brix – amount of soluble solids in the juice; the solids are mostly sugars

Statistician’s description of study design

Vincent’s study used six blocks laid out on the vineyard. There was one area on the north side of the vineyard and one area on the south side of the vineyard each divided into three east-west blocks. The same layout was used in each of the two areas (north and south).

Hear about constraints on the study design

Click the play button to hear about constraints on the design of the study.