Original research articles

The impact of differences in soil texture within a vineyard on vine vigour, vine earliness and juice composition

Abstract

Aims: The young alluvial soils of the Wairau Plains, Marlborough, New Zealand, are considered to play an important role in determining this unique wine style. The aim of this experiment was to investigate, within a single vineyard, the impact of soil texture on vine vigour, vine earliness and fruit composition.

Methods and results: Trunk circumference and pruning weights, were greater as the depth to gravel increased. Soil conductivity measurements, using an electromagnetic sensor (EM38) in conjunction with global positioning related well to vine trunk circumference. Where gravels came to the surface, soil temperatures measured at 30 cm depth were consistently higher by 1 to 2 °C (air temperature was unaffected) and vine phenology was more advanced, when compared to the deep silt soils. At harvest, fruit soluble solids and pH were higher and titratable acidity lower when vines grown on shallow soils, but soil type had no significant effect on fruit yield.

Conclusions and significance of the study: Vine phenology during the growing season and fruit composition at harvest but not yield, reflect changes in soil texture over quite short distances within vineyards on the Wairau Plains. Within a vineyard, the higher the proportion of gravelly soils, the more advanced the vine phenology and the riper the fruit and wine style will exhibit riper (more tropical) and lower unripe (herbaceous) characteristics on a particular date.

Authors


Michael C. T. Trought

Affiliation : The New Zealand Institute for Plant & Food Research Limited, Marlborough, Marlborough Wine Research Centre, 85 Budge St, PO Box 845, Blenheim 7240, New Zealand; Lincoln University, PO Box 84, Lincoln University, Lincoln 7647, Christchurch, New Zealand

MTrought@hortresearch.co.nz

Robyn Dixon

Affiliation : Marlborough Wine Research Centre, PO Box 845, Blenheim, New Zealand


Tessa Mills

Affiliation : Auckland University, Auckland, New Zealand


Marc Greven

Affiliation : HortResearch, Marlborough Wine Research Centre, Blenheim, New Zealand


Rob Agnew

Affiliation : HortResearch, Marlborough Wine Research Centre, Blenheim, New Zealand


Jeffrey L. Mauk

Affiliation : Auckland University, Auckland, New Zealand


John-Paul Praat

Affiliation : Lincoln Ventures Ltd., Hamilton, New Zealand

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