The effect of soil chiseling, in a clayey humid subtropical soil under
NT, reduced the size of soil aggregates, in the layer 0.07 to 0.17 m, in the first six months after this practice. However,
12 months after the soil chiseling, the aggregates returned to the original size. Root growth was favored in
the layer between 0.07 and 0.20 m, due to the chisel action, and did not influence soil aggregation in relation to
the control treatment. The soil chiseling practice, therefore, did not promote persistent improvement in the structure
of a clayey soil under NT, in humid subtropical climate region.