Chemistry — The Nitrogen Cycle
Fixation, nitrification and denitrification.
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digraph NitrogenCycle {
node [shape=box, style=rounded];
"N2 (atmosphere)" -> "Ammonium" [label="nitrogen fixation"];
"Ammonium" -> "Nitrite" [label="nitrification"];
"Nitrite" -> "Nitrate" [label="nitrification"];
"Nitrate" -> "Plants" [label="assimilation"];
"Plants" -> "Ammonium" [label="decomposition"];
"Nitrate" -> "N2 (atmosphere)" [label="denitrification"];
}