Fundamentals of Soil Science

5 functions

of soil

Brady & Weil, 2002

Photos J.L. Deenik

http://compost.tamu.edu/demos/palopinto/compost.jpg

J.L. Deenik

Courtesy G. Fukumoto

Brady & Weil, 2002

Brady & Weil, 2002

Courtesy R.Ogoshi

Functions of Soil

Medium for plant growthRecycling systemHabitat for organismsSystem for water supply and purificationEngineering medium

Brady & Weil, 2002

Courtesy H. Ikawa

http://soils.usda.gov/technical/classification/orders/vertisols.html

Courtesy H. Ikawa

Courtesy H. Ikawa

Courtesy R. Ogoshi

Why Such Diversity?Parent MaterialClimateBiotaTopographyTime

http://www.diggles.com/pgs/2003/PGS03-01.html

Why Study Soil?The living skin of the earth sustaining life(6.4 billion people and rising)We need to feed a growing population.What we do to our soils we do to ourselves!If we understand the fundamental role of soils, we can protect them

“Ua Mau ke Ea O ka `Aina I ka Pono”

Current ProblemsWorld population is increasing rapidlyOnly 10% of the world’s land area is suitable for growing cropsSoil quality is degrading world-wideGood soil management enhances soil, water, and air quality.