Practice exam #3 - QUESTION 4
Fragment of a discussion from Course talk:APBI200
Biological N-fixation is the process by which organisms convert Organic, plant unavailable atmospheric Nitrogen gas (N2) into inorganic, plant available forms of Nitrogen! It has a significant difference to both NH4 and Phosphate fixation, as those imply a different kind of “fixation”. Rather than being made available to soil organisms/higher plants, NH4 and phosphate are “fixed” within the crystalline structures of certain minerals and are thus made UNAVAILABLE until these are potentially weathered.
basic idea ok Jacob,
Note that atmospheric N2 gas is inert (not considered to be organic)
consider adding more specifics on ammonium fixation and phosphate fixation
SandraBrown (talk)