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9 January, 06:39

According to john wesley powell, how much annual rainfall was necessary to grow crops in arid regions like the southern great plains

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  1. 9 January, 09:56
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    According to John Wesley Powell, the minimum rainfall to grow crops in arid regions was 20 inches of rain annually only to have a successful farming on the plains; However, with that quantity agriculture would not be uniformly successful from season to season.
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