Table 6 Correlations between the modified basal and predicted annual mineralisation rates of the SNAP model and region-specific edaphic properties. Significant correlations are in italics; Pearson correlations (top entry per cell) and p values (in brackets) are presented

  0–15 cm

BNM (mg N kg⁻¹ day⁻¹)

− 0.008 (0.984)

0.270 (0.518)

0.396 (0.331)

− 0.232 (0.581)

− 0.191 (0.651)

0.126 (0.767)

− 0.065 (0.879)

− 0.243 (0.562)

Normalised GNA (mg N kg⁻¹ day⁻¹)

0.259 (0.535)

0.106 (0.803)

0.228 (0.587)

0.054 (0.900)

− 0.253 (0.546)

− 0.015 (0.971)

0.064 (0.880)

− 0.489 (0.218)

MNM [kg N (ha of topsoil)⁻¹ year⁻¹]

0.473 (0.236)

− 0.277 (0.506)

− 0.197 (0.639)

0.434 (0.282)

− 0.387 (0.344)

− 0.353 (0.392)

0.369 (0.369)

− 0.429 (0.289)

Boland region

  0–15 cm

BNM (mg N kg⁻¹ day⁻¹)

− 0.526 (0.284)

0.678 (0.139)

0.826 (0.043)

0.120 (0.822)

0.250 (0.632)

0.270 (0.604)

− 0.268 (0.608)

− 0.661 (0.153)

Normalised GNA (mg N kg⁻¹ day⁻¹)

− 0.563 (0.244)

0.806 (0.053)

0.903 (0.014)

0.136 (0.797)

0.202 (0.701)

0.154 (0.771)

− 0.166 (0.753)

− 0.795 (0.059)

MNM [kg N (ha of topsoil)⁻¹ year⁻¹]

− 0.556 (0.252)

0.690 (0.129)

0.828 (0.042)

0.172 (0.745)

0.196 (0.710)

0.214 (0.684)

− 0.212 (0.687)

− 0.661 (0.153)

Combined: Tsitsikamma and Boland regions

  0–15 cm

BNM (mg N kg⁻¹ day⁻¹)

− 0.328 (0.252)

0.250 (0.389)

0.309 (0.283)

− 0.247 (0.395)

0.239 (0.411)

0.308 (0.284)

− 0.290 (0.314)

− 0.518 (0.058)

Normalised GNA (mg N kg⁻¹ day⁻¹)

− 0.305 (0.289)

− 0.159 (0.588)

− 0.162 (0.580)

− 0.599 (0.024)

0.740 (0.002)

0.669 (0.009)

− 0.700 (0.005)

− 0.813 (< 0.001)

MNM [kg N (ha of topsoil)⁻¹ year⁻¹]

− 0.051 (0.863)

0.034 (0.909)

0.091 (0.757)

0.012 (0.967)

0.195 (0.504)

0.122 (0.679)

− 0.146 (0.618)

− 0.492 (0.074)