Soils of the - Agriculture and Agri-Food Canada

(RD )
Plate 37 Ryder soil profile (Orthic Hume-Ferric Podzol) These
soils have developed in 50 cm or more of silty, eolian material
overlying glacial till. In the photo, the contact between the two deposits
is at about 3.5 ft. (105 cm). Note the good root distribution in the
silty material .
Commonly Associated Soils : Lonzo Creek, Calkins Marble Hill, Cannel) and Poignant soils are frequentt ÿ
closely associated in the landscape with Ryder soils . Lonzo Creek soils are similar to Ryder soils differing only i n
the depth of the silty eolian capping . The depth in Lonzo Creek soils is 20 to 50 cm . Marble Hill soils also have ,a
silty capping similar to Ryder soils : the underlay, however, is gravelly glaciotluvial materials rather than glacia l
till . Calkins soils differ by being poorly drained while Cannell soils are underlain by bedrock within 100 cm of the
surface . Poignant soils differ by having developed from a mixture of stony colluvium and silty eolian material .
1ilttgetation : Areas with more subdued topography are mostly cleared and cultivated . The steeper, uncleared
areas support a variable, mainly second-growth . forest which includes coast Douglas-fir, western hemlock, re d
; ,er, vine and bigleaf maple and western red cedar. The undergrowth includes salal . bracken . Pacific:
: wood, thimbleberry and moss . Rooting is unrestricted in the silty overlay but decreases abruptly in tt1
*Impact underlying glacial till . A variable, discontinuous root mat is often present immediately above the till .
General Land Use Comments : (1) Ryder soils are suited for most agricultural crops although advers*
topography limas their use in many areas . Droughtiness during the latter part of most growing seasons effect s
late maturing crops and irrigation is beneficial . (2) In areas where topography is not excessive, Ryder soils are
rftvderately suited for urban and related uses . Surface erosion of exposed . sloping areas is likely during heavy
rains and septic tank effluent disposal may be impeded by the compact, slowly permeable underlying glacia l
till . (3) Forest growth is moderately good . the main growth limitation being droughty conditions during the latte r
parts of most growing seasons . Data from a limited number of plots indicates potential annual wood production
by Douglas-fir to be between 9 and 12 m'iha .
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