Agriculture Reference
In-Depth Information
N
0
5
10
15
Kilometers
Lake
County
Yolo
County
Mount
St.
Helena
Calistoga
Diamond Mtn.
Howell Mtn.
Spring Mtn.
St. Helena
Rutherford
Sonoma
County
Oakville
Yountville
Stags Leap District
Atlas Peak
Mt. Veeder
Wild Horse Valley
CALIFORNIA
Napa
Carneros
Napa Valley
Solano
County
0 200
Kilometers
SAN PABLO BAY
Figure 9.8
Map of the Napa Valley Viticultural Area with its constituent AVAs or subappellations.
Both the AVA name and Napa Valley name must appear on bottles of wine in which 85%
or more of the grapes come from that AVA (Elliot-Fisk 1993). Reproduced from the
Journal of Wine Research with permission of Taylor & Francis Ltd. The journal's Web
site is located at
http://www.tandf.co.uk/journals.
the soil formed on the ultrabasic rocks high in Mg and sometimes Ni, which is
toxic. Increasingly, however, vines are being established on soil formed on the vol-
canic ash or tuff. Vines grow well on the alluvial valley floor, but they can be ex-
cessively vigorous. Vigor is managed by the appropriate choice of rootstocks (e.g.,
101-14, 3309, and True SO-4), canopy pruning, and
RDI
(section 6.5.2). In the
southern Carneros district, because the silty and clayey soils are naturally poorly
drained, subsoil drainage has been installed to improve vine performance. Because
of cooling winds from San Pablo Bay, Pinot Noir and Chardonnay grow well.
The most favored areas of Napa are the benches in the footslope regions,
where the soils are shallower, less fertile, very stony in places, and well drained
(Lambert and Kashiwagi 1978). Here, the mesoclimate is also very favorable, es-
pecially on the western side that receives the morning sun, but is shaded by the
