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National Geographic : 1910 Sep
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THE NATIONAL GEOGRAPHIC MAGAZINE WHEAT YIELD INCREASED 133 PER CENT BY PHOSPHATE Wheat-growing experiments at Urbana (Illinois) Agricultural Station, on land where cow peas had been plowed under. Land shown in upper picture was given an application of lime, and yielded only 9.2 bushels of wheat per acre. In lower picture lime and phosphorus were used together, and yield was increased to 21.5 bushels per acre. 784
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