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<table border="solid" bordercolor="black" RULES=NONE FRAME=border bgcolor="#000000"><tr><td align="center" bgcolor="#003300"><font color="FF9900">A NH4(+) cation, usable to plants although nitrate NO3(-) form of nitrogen is preferred.
The most abundant element in plants after carbon, oxygen and hydrogen.
We have hugely altered the "natural" nitrogen cycles of the world by the invention and using of the Haber-Bosch process to fix N2 from atmoshpere to NH3 by using energy and H2 from fossilic fuels. This alteration basicly made it possible to increase human population to it current numbers.
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