International Journal of Agronomy / 2012 / Article / Tab 5

Research Article

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

Table 5

Total inorganic nitrogen (NH4 and NO3) mineralization in clean chip residual, pine bark and peatmoss substrates.

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

0–7 days
0.48 cm CCR31283712816
0.95 cm CCR4477262515174
PB44564401458459
PM1753254933595264790

MSD Substrate130174250850

0–15 days
0.48 cm CCR5861425055
0.95 cm CCR53526416879
PB5882931572442
PM1619293736105869588

MSD Substrate169281169630

0–30 days
0.48 cm CCR101148998067
0.95 cm CCR114116102310119
PB75108152106182
PM2530359140436149768

MSD Substrate342429356402

0–60 days
0.48 cm CCR63879111744
0.95 cm CCR9114212114234
PB33395876194
PM1806263235335404783

MSD Substrate44150205734

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).