Soils.

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Presentation transcript:

Soils

Soil Textural Triangle

Porosity vs. Permeability

Soil Structure – Costa Rica What happens to soil structure when a tractor drives over the surface?

Soil Profile

Costa Rica Road Cut

Soil Horizons

Mosaic of closely packed pebbles, boulders Alkaline, dark, and rich in humus Weak humus- mineral mixture Dry, brown to reddish-brown, with variable accumulations of clay, calcium carbonate, and soluble salts Clay, calcium compounds Desert Soil (hot, dry climate) Grassland Soil (semiarid climate)

Tropical Rain Forest Soil (humid, tropical climate) Forest litter leaf mold Acid litter and humus Acidic light- colored humus Humus-mineral mixture Light-colored and acidic Light, grayish- brown, silt loam Iron and aluminum compounds mixed with clay Dark brown firm clay Humus and iron and aluminum compounds Tropical Rain Forest Soil (humid, tropical climate) Deciduous Forest Soil (humid, mild climate) Coniferous Forest Soil (humid, cold climate)