An Essay on Calcareous Manures

work by Ruffin

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June 26, 2026

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An Essay on Calcareous Manures is a significant work by Edmund Ruffin, often called the father of soil chemistry in the United States. Published in 1832, the essay details Ruffin's findings on how to restore fertility to depleted Southern plantations.1

Ruffin observed that the soils in the American South had become too acidic to retain fertilizers effectively. His research demonstrated that applying calcareous earths, a type of marl, could reduce soil acidity. Ruffin's methods, which included specific instructions for fertilizing, plowing, planting, crop rotation, and drainage, led to significantly enhanced crop yields. His work was highly influential in promoting scientific agriculture in the South.12

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Edmund Ruffin
…a highly influential book, An Essay on Calcareous Manures (1832)—in which he explained how applications of calcareous earths (marl) reduced soil acidity. Even more persuasive were Ruffin’s enhanced yields of corn and wheat on lands fertilized, plowed, planted, rotated, and drained according to his instructions.
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…a highly influential book, An Essay on Calcareous Manures (1832)—in which he explained how applications of calcareous earths (marl) reduced soil acidity. Even more persuasive were Ruffin’s enhanced yields of corn and wheat on lands fertilized, plowed, planted, rotated, and drained according to his instructions.
Read More