Similar to numerous Pessac-Léognan estate-wines,
the complexity of Couhins’s terroir results from its topography and diversified soils. The vines develop differently under these heterogeneous conditions,
one sign of which being differences in vine vigour*,
a key parameter in grape maturation.
the complexity of Couhins’s terroir results from its topography and diversified soils. The vines develop differently under these heterogeneous conditions,
one sign of which being differences in vine vigour*,
a key parameter in grape maturation.
A profound knowledge of the vineyard
We aim at adapting all operations to these variations. We therefore assess the vine vigour by plant, using a new technique perfected by the INRA. Crossing this information with other parameters which have been observed and chartered over several years (soil resistivity**, ripeness monitoring), we define homogeneous zones.
Bespoke wine-growing
In this way we adapt our manure protocol, grassing over and green operations. This precise knowledge of the vineyard also enables us to improve bio-control of pests. Last but not least, we harvest and vinify the grapes from these different zones in specific manners.
* vigour: plant growth
** measuring soil resistivity gives a first indication of the presence of water, therefore of clay; this is corroborated
by digging soil pits.
by digging soil pits.
Potential mineralization
of soil nitrogen
of soil nitrogen
Leaf surface index
Slashing weight
Absorbable nitrogen (grape must)
Sugars
Anthocyanes
Soil mapping
(resistivity)
(resistivity)
Homogeneous zones within a block
Since 2007, we have been able to map vine vigour with a precision
of 1m² using a probe (“Green Seeker”) which analyses light canopy reflectance in the red and near infra-red spectra, making it possible
to draw a map with a GPS system.
of 1m² using a probe (“Green Seeker”) which analyses light canopy reflectance in the red and near infra-red spectra, making it possible
to draw a map with a GPS system.
