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National Geographic : 1911 Apr
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0 zO C) Photo from Illinois Agricultural Experiment Station FuELD SHOWING THE VALUE OP POTASH TO THE "ARMER The soil is mucky and deficient in potash; the plat on the left has been enriched with potash, and yieldsaluxuriant crop. The center plat had no potash application, and the crop is scanty . y'. l . .!itfMu A_l i _ tt r '" :' Iws.,ta'it >w, wl~( had no potash application, and the crop is scanty
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