Soils

HORT 350

Arboriculture

Spring 2004

Arboriculture

Horticulturists rarely deal with soil!

Arboriculture

Soil Components

Minerals50%

O.M.2%

Macropores24%

Micropores24%

Hygroscopic

Arboriculture

Soil Components-after compaction

Minerals50%

O.M.2%

Macropores16%

Micropores32%

Hygroscopic

Arboriculture

Growth limiting bulk density (g/cm3) soil

triangle/ after Daddow and Warrington 1983

1.75

1.40

1.45

1.65

1.55

Arboriculture

Soil Compaction following Construction/ J. Env. Hort. 2:48:’84

0.9

1.1

1.3

1.5

1.7

1.9

0.9 0.94 1.04 1.04 1.02 1.16

0

50

100

150

200

250

Disturbed Bulk Density (g/cm3)

Undisturbed Bulk Density (g/cm3)

Change (%)

Arboriculture

Root Growth vs Soil Compaction / J. Env. Hort. 2:48:’84

R2 = 0.70

R2 = 0.98

0

3

6

9

12

15

1 1.05 1.1 1.15 1.2 1.25 1.3 1.35

Cornus root DWForsythia root DW

Root Dry Weight (g)

Soil Bulk Density g/cm3)

Arboriculture

Soil Compaction vs Depth/J. Appl. Ecol. 19:167:1982

0

5

10

15

20

25

30

35

0 5 10 15 20 25

5 cm10 cm15 cm20 cm25 cm30 cm

Vehicle Passes (no.)

Soil Strength (kg/cm2) Wet loamy sand

0 passes

Compacted

Compaction during home construction

Arboriculture

Lethal temperatures for soil microorganisms/

after Baker 1957

Media Particle Size Affects Air PorosityVan Shoor et al. 1990

010203040506070

Aserin Corteza Turba Arena

<1 mm

1-2 mm

Porcentaje (%)

Componente