Subsoil plow

Subsoil plow

A plow that had no moldboard and was used to plow deeper than a conventional Turning plow in order to break up the subsoil.
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His soil-shattering demonstrations with an original-condition 1940 Cat Model R-5 and subsoil plow were truly amazing.
Although Caterpillar equipment is still used on many large farms to pull multi-shank, deep-ripping subsoil plows, articulated four-wheel-drive machines, or new rubber-tracked agricultural tractors, have for the most part replaced the slower crawlers in the field.
As recently as the late 1970s, huge farming operations in California's Central Valley used D9 Cats to pull 15-foot-wide subsoil plows with four or five shanks.