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Subsoiling and slit tillage can increase root growth through subsurface hardpans. In-row subsoiling fractures a section of the pan below the row. Slit tillage cuts a 3-mm-wide slit through the pan with a thin blade mounted on a shallow subsoil shank. Subsoiling is usually repeated annually. Slit tillage has been reported as an alternative to subsoiling that does not need to be repeated annually...
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