1. What do these guys have in common?

2. What do we need nitrogen for?
Protein for muscle
DNA

3. Where is it? Air =oxygen, carbon dioxide nitrogen, argon, 78%: 21%
0.93%
0.038%

4. Where is it? Air = 78% nitrogen, 21% oxygen, 0.93% argon,
0.038% carbon dioxide

5. Cycling Nitrogen
78% of the atmosphere is Nitrogen gas (N2) = lots of nitrogen available = what’s the problem Plants and animals are not able use N2 to make protein and other necessary molecules How does this nitrogen move from the atmosphere to the organisms?

7. How does this nitrogen move from the atmosphere to the organisms?
It moves through the Nitrogen cycle
Step 1
Nitrogen fixation
N2  NH4+
Who does it
Nitrogen fixing Soil bacteria, bacteria in root nodules of legumes
Where does it happen
Soil, legume root nodules

8. How does this nitrogen move from the atmosphere to the organisms?
It moves through the Nitrogen cycle
Step 2
The NO3 created can be used by plants and moves up the food web
Nitrification
NH4+  NO2-  NO3-
Who does it
Nitrifying Soil bacteria
Where does it happen
Soil

9. How does this nitrogen move from the atmosphere to the organisms?
It moves through the Nitrogen cycle
Step 3
Denitrification
NO  N2
Who does it
Denitrifying bacteria,
Where does it happen
Soil

10. How does this nitrogen move from the atmosphere to the organisms?
It moves through the Nitrogen cycle
Step 4
Atmospheric Fixation
N2  NO3-
Who does it
Lightning
Where does it happen
Atmosphere

11. Assignment Nitrogen Cycle
-Questions -Aquaponic System