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John D. Hamaker, co-author with Don Weaver, The Survival of
Civilization. Michigan, 1976-77. Glacial moraine gravel dust spread on 10 acres.
- In an area of sparse rainfall and dry summers, and with no irrigation, the corn produced
65 bushels per acre, compared to yields of under 25 bushels per acre from other local
farms.
- Independent analyses revealed the following increases in nutrients, compared with the
same type of corn grown with chemical fertilizers nearby:
- 28% more protein
- 47% more calcium
- 57% more phosphorus
- 60% more magnesium
- 90% more potassium.
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