CONE index values indicated that the residual effec-tiveness of in-row subsoiling was evident for one additional year but was not detectable beyond 2 yr in a Coastal Plain soil. Recompaction of soil occurred using either no-till or moldboard tillage, with no-till resulting in a loss of 50 percent of the potential root zone compared to moldboard plow.
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E. D. Threadgill (1982) studied this question.