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Crop rotation and livestock feeding limits soil fertility
In answer to inquiries, the article argues crop rotation cannot maintain soil fertility and enrich all elements. It notes nitrogen may be added but phosphoric acid and potash must come from soil or manure, and warns that feeding crops to livestock on the same farm does not replenish fertility. It compares barnyard manure with commercial fertilizer and explains nitrogen loss through feeding and plant uptake. (Continued on page nine)
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