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Peter van Straaten: Crops from Rocks

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Peter van Straaten
This retired agro-geologist from the University of Guelph explains how rocks become soil and their continuing roll in agriculture even when not degraded.
Item # CD-3913
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This retired agro-geologist from the University of Guelph explains how rocks become soil and their continuing roll in agriculture even when not degraded..

Recorded at the 2015 Acres U.S.A. Conference, Pittsburgh, Pennsylvania,Thursday, December 10, 2015.

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