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Updated: May 12, 2025
"No, not a pound of farm manure has been used on that plot for more than sixty years; and, furthermore, the two plots were very much alike at the beginning; but, to the high-yielding plot, nitrogen, phosphorus, potassium, magnesium, calcium, and sulfur have all been applied in suitable compounds every year." "That is to say," observed Mr.
Thornton. "Yes, and great care has always been taken to have these two plots treated alike in all respects, save one." "And what was that?" "Plant food was regularly incorporated with the plowed soil of the high-yielding plot." "You mean that farm manure was used?"
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