Soil

Rumen

Primarily interacts with mineral phase [30]

Primarily interacts with organic matter [32]

Absorbs soil nitrogen and supplies it primarily to root systems [31]

Absorbs soil nitrogen and supplies it primarily to ruminal microbes [33]

Primarily affects nitrogen monoxide emissions [31]

Affects methane production [32]

Interacts with soil microbes, plants microbes, and soil macrofauna [30]

Interacts only with ruminal microorganisms [33]

1) Interact with methanogens and gets hydrogen produced by protozoa [33]

2) Manifests all electrochemical properties [34]

3) Can act as both electron sink and electron source [34]