Solution:
Nitrogenase enzyme catalyses the nitrogen fixation in root nodules of leguminous plants. The reaction is as follows:
$$
\begin{aligned}
&N_{2}+8 e^{-}+8 H^{+}+16 A T P \longrightarrow \\
&2 N H_{3}+H_{2}+16 A D P+16 P i
\end{aligned}
$$
So, products of nitrogen fixation are both ammonia and hydrogen