Agriculture Reference
In-Depth Information
0
(a)
20
0
(b)
20
40
40
Clay
Fine silt
Coarse silt
Fine sand
Coarse sand
Gravel
60
Clay
Fine silt
Coarse silt
Fine sand
Coarse sand
60
80
100
80
120
140
100
160
0
20
40 60
Content (%)
80
100
0
20
40 60
Content (%)
80
100
0
(c)
20
40
60
Clay
Fine silt
Coarse silt
Fine sand
Coarse sand
Gravel
80
100
120
140
160
180
0
20
40 60
Content (%)
80
100
Gravel and fine earth contents of soil profiles in the lower land of St. Emilion-Pomerol.
(a) Deep gravelly soil (type 1) at La Medoquine, Château Cheval Blanc. (b) Deep sand
over sandy clay (type 2) at Haut Dominique, Château Cheval Blanc. (c) Gravelly sand
over heavy clay (type 3) at Château Trottany in Pomerol (redrawn from van Leeuwen and
Merouge 1998).
Figure 9.3
file, the size of pebbles on the surface, drainage, and aspect (Johnson 1994). As
in St. Emilion-Pomerol, the depth of rooting and regulation of the vine's water
supply are the main determinants of quality and wine character. Vines on shal-
low, very gravelly soils, as in Margaux, may suffer too much water stress during
dry summers but do very well in wet years when the free drainage of the gravelly
