Science: Sense About Soil

Never before has farming been so full of faddists making loud claims and crying simple cures. In the latest issue of the authoritative Scientific Monthly, Dr. Charles E. Kellogg, head of the Division of Soil Survey, U.S. Department of Agriculture, assesses them all with a skeptical eye. Some of the popular theories, he believes, have good things in them, but none of them tell the whole story.

The oldest of the fashionable farming theories, says Dr. Kellogg, teaches that "the soil is like a bank"; the farmer must deposit (in fertilizer) as much as...

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