Here is all the data you could ever want about the one and only soil type that is present in the SAGE Garden.
Willamette Silt Loam is
a Fine-silty, mixed, superactive, mesic, Pachic Ultic Argixeroll (try
saying that 5 times fast). It is a well-drained Mollisoll that is
composed of 3-15% Sand, 60-80% Silt, and 15-25% Clay, and 1.5-6.5%
Organic Matter in the upper layers.
It is "suited to a wide range of plants and may be
used safely for cultivated crops, pasture, range, woodland, and
wildlife. The soils are nearly level and erosion hazard (wind or water) is low. They are deep, generally well
drained, and easily worked. They hold water well and are either fairly
well supplied with plant nutrients or highly responsive to inputs of
fertilizer. The soils in class I are not subject to damaging overflow. They are
productive and suited to intensive cropping."
In other
words, it is well suited to the use to which it is being put by the SAGE
garden, and the community garden just north of it.
The soil profile (left) illustrates the following characteristics:
The Willamette series consists of very deep, well drained soils that
formed in silty glaciolacustrine deposits. They are on broad valley
terraces and have slopes of 0 to 20 percent. The mean annual
precipitation is about 45 inches and the mean annual temperature is
about 52 degrees F.
TYPICAL PEDON: Willamette silt loam, cultivated. (Colors are for moist soil unless otherwise noted.) Ap--0 to 6 inches; very dark brown (10YR 2/2) silt loam, grayish
brown (10YR 5/2) dry; weak medium subangular blocky structure; hard,
friable, slightly sticky and slightly plastic; many very fine roots;
many very fine irregular pores; moderately acid (pH 5.6); abrupt smooth
boundary. (5 to 7 inches thick)A--6 to 13 inches; very dark brown (10YR 2/2) silt loam, grayish
brown (10YR 5/2) dry; moderate medium subangular blocky structure; hard,
friable, slightly sticky and slightly plastic; many very fine roots;
many very fine tubular and irregular pores; moderately acid (pH 5.6);
clear smooth boundary. (4 to 8 inches thick) AB--13 to 24 inches; very dark grayish brown (10YR 3/2) silt
loam, grayish brown (10YR 5/2) dry; moderate coarse prismatic and
moderate medium subangular blocky structure; hard, friable, slightly
sticky and slightly plastic; common very fine roots; many very fine
tubular pores; moderately acid (pH 5.6); clear smooth boundary. (0 to 12
inches thick) BA--24 to 33 inches; dark brown (10YR 3/3) silty clay loam, brown
(10YR 5/3) dry; moderate coarse prismatic and moderate medium
subangular blocky structure; hard, firm, slightly sticky and slightly
plastic; common very fine roots; many very fine tubular pores;
moderately acid (pH 5.8); clear smooth boundary. (7 to 11 inches thick) 2Bt--33 to 45 inches; dark brown (10YR 3/3) silty clay loam,
brown (10YR 5/3) dry; moderate medium prismatic and moderate medium
subangular blocky structure; hard, firm, moderately sticky and
moderately plastic; common very fine roots; many very fine tubular
pores; common distinct and faint clay films along pores and on faces of
peds; gray silt particles on 20 percent of vertical faces of peds; few
very fine black stains; moderately acid (pH 5.8); diffuse smooth
boundary. (10 to 26 inches thick) 2BCt--45 to 53 inches; dark yellowish brown (10YR 3/4) silty clay
loam, yellowish brown (10YR 5/4) dry; weak medium subangular blocky
structure; slightly hard, friable, moderately sticky and moderately
plastic; few fine roots; many very fine tubular pores; very few faint
and distinct clay films along pores; moderately acid (pH 5.8); clear
wavy boundary. (0 to 17 inches thick) 2C--53 to 60 inches; dark yellowish brown (10YR 4/4) silty clay
loam, light yellowish brown (10YR 6/4) dry; massive; slightly hard,
friable, slightly sticky and slightly plastic; few fine roots; many very
fine pores; few medium tubular pores; very few distinct clay films
along pores; moderately acid (pH 5.9).
Willamette Silt Loam is
a Fine-silty, mixed, superactive, mesic, Pachic Ultic Argixeroll (try
saying that 5 times fast). It is a well-drained Mollisoll that is
composed of 3-15% Sand, 60-80% Silt, and 15-25% Clay, and 1.5-6.5%
Organic Matter in the upper layers.
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