International Journal of Agronomy / 2012 / Article / Tab 4

Research Article

Nitrogen Immobilization in Plant Growth Substrates: Clean Chip Residual, Pine Bark, and Peatmoss

Table 4

Microbial respiration in clean chip residual, pine bark and peatmoss substrates.

SubstratezCarbon mineralization (mg/kg)
0 mg N1 mg Ny2 mg N3 mg NMSD N-ratex

0–7 days
0.48 cm CCR2370323635843882113
0.95 cm CCR1757259329873414154
PB1918231123672478111
PM14394614258335

MSD Substrate84121284170

8–15 days
0.48 cm CCR2615282728883358183
0.95 cm CCR2200262031053706209
PB1625198619442021329
PM356384353371117

MSD Substrate283140172149

16–30 days
0.48 cm CCR3479361536313436134
0.95 cm CCR3229355637283714225
PB2254248525852586129
PM751591578641166

MSD Substrate195139123126

31–60 days
0.48 cm CCR4133381237213837459
0.95 cm CCR4082421140413767324
PB2950317333563417190
PM1723168215811582258

MSD Substrate355166238248

Total: 0–60 days
0.48 cm CCR12360134141377814108609
0.95 cm CCR11016131101437714624799
PB8954100971031310484422
PM2989292227622781440

MSD Substrate668405662409

zCCR:  clean chip residual, PB:  pine bark, and PM:  sphagnum peatmoss.
y2000 ppm stock solution of NH4NO3 (0, 0.5, 1.0, 1.5 mL).
xMSD based on Waller-Duncan ratio -tests (   =  0.05).