Subsurface tile drainage is a common water management practice in much of the Midwest. Although subsurface drainage has many benefits, it also may increase nitrate-N losses through the rootzone and out to surface waters. An appropriate balance between increasing drainage intensity (narrower spacing) to improve drainage and decreasing drainage intensity to reduce nitrate-N losses needs to be found in order to protect surface water quality. We have measured nitrate leaching into tile drains of three different spacings at a long-term research site in southeastern Indiana. Over the 15-yr period, we have sequentially changed management practices to try to reduce nitrate leaching from the rootzone. This report summarizes our major findings.