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Soil

 

Air
Biodiversity
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Water

 

Contaminated Soil ] Earthen Floors ] Mulch ] Organic Landscape Maintenance ] Soil Biodiversity ] Soil Erosion ] Soil Fertility ] Soil Health ]

A raindrop is like a miniature water bomb: it hits the ground at 20 miles per hour. When raindrops hit bare soil, water can splash soil up to 6 feet away, carry particles away, and drop sediment into drainageways. Wind also dislodges, moves, and transports soil particles.  We need that topsoil; it nourishes our food and allows us to live, but it can take almost 1,000 years to be created (Oregon Association of Conservation Districts 2007).  In Portland specifically, composted soil can be made in a week (Plantea 1998). 

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Cover:  Illustration by Dianne Tolman, a small business owner of Big Pine Native Plants.

2008 Deborah Tolman, Ph.D., Michelle Lasley, and Joe Parker