Effective farming; a text-book for Effective farming; a text-book for American schools effectivefarming00samp Year: 1919 Farm Machinery 449 Subsoil plows. — What are known as subsoil plows (Fig. 198) are employed to follow in the furrow made by a regular plow for the purpose of loosening the soil below the plow depth. Fig. 198. — Subsoil plow. They do not turn a furrow. In regions where hard-pan is found just below plow depth, subsoil plows are very efficient for increasing the depth of soil available for the roots.

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