In 1936, about 3,351,000 tons of U. S. phosphate rock were used, chiefly to make fertilizer for U. S. farmers and for export. At this rate, the estimated phosphate resources of the U. S. will last about 2,000 years. Nonetheless, President Roosevelt was moved last week to send Congress a message about the conservation of phosphates. His major points:
1) Phosphates are an important fertilizer and the phosphate content of some U. S. lands is already badly depleted.
2) Of the total 17,200,000,000-ton world supply of phosphate rock, the U. S. has 7,200.000,000 tons....
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