1939
DOI: 10.9783/9781512814323
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Elizabeth Stuart Phelps

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“…Samples of soil carried 500 miles from Texas to Iowa had 10 times as much organic matter, 9 times as much nitrogen, 19 times as much phosphoric acid, and 45 percent more potash as compared to the soil that remained. 39 The Great Plains is a transitional climatic region most often affected by drought and has the continent's strongest winds. Under normal conditions of ground cover, wind erosion is a normal geologic process, but with sufficient cover the soil historically has not been seriously affected.…”
Section: IIImentioning
confidence: 99%
“…Samples of soil carried 500 miles from Texas to Iowa had 10 times as much organic matter, 9 times as much nitrogen, 19 times as much phosphoric acid, and 45 percent more potash as compared to the soil that remained. 39 The Great Plains is a transitional climatic region most often affected by drought and has the continent's strongest winds. Under normal conditions of ground cover, wind erosion is a normal geologic process, but with sufficient cover the soil historically has not been seriously affected.…”
Section: IIImentioning
confidence: 99%