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Unformatted text preview: were invented to turn the sod. Some of our most productive soils could not be exploited until drainage was developed as well. Indians of the North American prairie region who practiced agriculture kept to wooded loess soils of river terraces and woodland bottoms and avoided the prairie proper. White settlers who fol-lowed did the same, moving from woodland to woodland and skipping the prairie because they could not mange the sod. The only major crop that might be ascribed to temperate prairie is sun F ower ( Helianthus annus ) and it was initially cultivated in adjacent woodlands. Fig. R 3-2. Centers and noncenters of agricultural origins: (A1), Near East center, (A2), African noncenter, (B1), North Chinese center, (B2), Southeast Asian and South Paci f c noncenter, (C1), Mesoamerican center, and (C2), South American noncenter (from Harlan, 1971; copyright 1971 by the American Association for the Advancement of Science)....
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