Test 1 2 3 4 5 6 Ammonification
- + ++ +++ + - Nitrate Reduction ++ - +++ ++ + - Nitrogen-fixation Growth Growth Growth Growth Growth Growth +++ Very high production, ++ High production, + Low production, - No production
in the rhizosphere was significantly influenced by the genotypes and endophyte status (Table 1).
This can accumulate in the system as nitrate, absorbed by phytoplankton (Hargreaves 1998), reconverted into ammonia by ammonification
or converted into molecular nitrogen.
Myers RJK (1974) Temperature effects on ammonification
and nitrification in a tropical soil.
pathway results in microbial excretion of N[H.sub.4.sup.+] into the environment where it is available as a substrate for nitrification.
The biological fixation of nitrogen involves two chemical reactions, ammonification
Nitrogen mineralization transforms organic N to N[H.sub.4.sup.+], a process also called ammonification
The transformation from one form to another involves several microbial processes, including ammonification
, nitrification, and denitrification.
The source of this [NH.sub.4]-N is uncertain, but is presumably due to mineralization of organic matter with release of [NH.sub.4]-N (ammonification
When these bacteria, or host plants, die, other microbes mineralize the protein (ammonification
) to ammonium ions (N[H.sub.4.sup.+]).
Integral to this degradation are several separate groups of bacteria that are key factors in the twin conversions known as ammonification
In the guts of invertebrates, and even in their excreta, ammonification
is intense, humus formation takes place, and even atmospheric nitrogen is fixed.