| 1. | On younger substrates, especially of volcanic origin, tropical soils may be quite fertile.
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| 2. | Oxisols, deeply weathered tropical soils, have a rich fossil record from the Paleoproterozoic onwards.
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| 3. | This holds especially true for highly weathered tropical soils.
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| 4. | Until recently, for example, soybeans were not thought to flourish in tropical soils and climates.
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| 5. | Approximately a third of all tropical soils are too acidic to support traditional food crops.
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| 6. | There's no production of coca in the border area because coca doesn't grow in tropical soil.
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| 7. | Influence of oxic / anoxic fluctuations on ammonia oxidizers and nitrification potential in a wet tropical soil.
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| 8. | Stonelayers occupy the base of biomantles in many, if not most, tropical soils and in many midlatitude soils.
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| 9. | Human activity is thought to account for 30 %; tropical soils and oceanic release account for 70 %.
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| 10. | Due to the low P availability in tropical soils this application would be especially useful in the tropics.
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