A labeled illustration of fertilizer plant on the top left and a farm with crops and animals is below the fertilizer plant. Below the farm soil is indicated with bacteria and roots. A lake is on the right to the fertilizer plant and farm consisting fishes, bacteria and green algae. A stream separates the fertilizer plant and the farm and joins the lake. A cloud is on the top of the lake showing lightning. Three cycles occurring in the biosphere are indicated using arrows. They are:

1. Biological: Indicated by blue arrows
2. Human: Indicated by yellow arrows
3. Physical/Chemical: Indicated by red arrows

The components involved in the process are:

1. Atmospheric Nitrogen (N2 gas)
2. Soil Nitrogen (NH3, NO2-, NO3-)
3. Dissolved Nitrogen

The text box indicating human nitrogen cycle reads ‘N2 gas is turned into fertilizer and applied to crops. Excess may wash into rivers, streams, and oceans as runoff.’ The text box indicating physical/chemical nitrogen cycle reads ‘Some N2 gas is fixed by lightning.’ The text box indicating biological nitrogen cycle reads ‘Bacteria releases N2 gas through denitrification.’ The text box indicating bacteria reads ‘Bacteria fix N2 gas.’ The text box indicating the animals reads ‘Nitrogen is taken up by primary producers, reused by consumers, and released by excretion and decomposing matter.’