Note the various forms of N
-:- 1. Ammonium (NH4+) cation in the soil solution and fixed in secondary clays
2. Nitrate (NO3-) anion in the soil solution
3. Organic N in the soil
4. Ammonia (NH3) gas (released to atmosphere)
5. NO, N2O, N2 gases (released to atmosphere)
anion- nitrogen
-:- ...
NH4 and NO3 in soil solution constitute about 1% of N in the soil. Again most of the N in
soils is in organic forms.
Due to rapid nitrification in soils, plants absorb predominately NO3.
Some plants prefer N in the NH4 form for example rice. Other plans that grow under acidic
conditions seem to prefer NH4 too.
ATP
✓ -:- adenosine triphosphate (drives most energy-requiring biochemical processes ex
uptake of nutrient)
3|Page | Grade A+| 2024/2025
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