Figure 5

Inverse distance weighted (IDW) maps of SOC, TN, C: N, δ13C, and δ15N in two plots (P1, P2) under three N fertilization treatments (i.e. NN, LN and HN) in GG cropland soils in a three-year long fertilization experimental site at the Tennessee State University (TSU) Agricultural Research Center in Nashville, TN, USA.