nitrogen_cycle

Table of Contents

Select a slide or start at the beginning.

• XII. Nitrogen Cycle
  
• A. Mineralization
  
• Total vs net N mineralization
  
• 1. Ammonification
  
• R - NH2 € NH4+
  
• a. Factors affecting ammonification
  
• 2) Soil pH
  
• Does the ammonification process affect soil pH?
  
• b. Management implications
  
• Many companies in Sweden and Finland stated to fertilize forests with urea instead of NH4NO3
  
• 2) Fire
  
• 2. Nitrification
  
• There are some heterotrophic microorganisms (mostly fungi) which also can nitrify NH4
  
• 2 NH4 + 3 O2 € NO2 + 2 H2O + 4H+
  
• 2 NH4 + 3 O2 € NO2 + 2 H2O + 4H+
  
• a. Water/O2
  
• b. Soil pH
  
• (Untitled)
  
• c. Management
  
• What would happen to soil pH if N is added as OM?
  
• B. Denitrification
  
• C6H12O6 + 4NO3 € 6 CO2 + 6 H2O + 2 N2 (or N2O)
  
• C6H12O6 + 4NO3 € 6 CO2 + 6 H2O + 2 N2 (or N2O)
  
• C6H12O6 + 4NO3 € 6 CO2 + 6 H2O + 2 N2 (or N2O)
  
• 3) Nitrogen Fixation