Fig. 7. Potential nitrogen leaching (PNL) index as a function of the uptake temperature sum (°Cd_N) for Swingle (SWL) and Volkamer (VLK) seedlings with the 7 mg N L^-1 (A) and 70 mg N L^-1 (B) treatments. Regression equations expresses PNL index as a function of uptake temperature sum (UTS) values.