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This paper provides an in-depth analysis of the feasabilty of this idea: https://pubs.rsc.org/en/content/articlelanding/2021/ee/d0ee0...

"Due to the emergence of low cost renewable electricity from solar and wind, there is renewed interest in decentralized opportunities for electricity-driven nitrogen fixation."

"This analysis shows that the energy consumption for NOX synthesis with plasma technology is almost competitive with the commercial process with its current best value of 2.4 MJ mol N−1, which is required to decrease further to about 0.7 MJ mol N−1 in order to become fully competitive"

Note that this measure of competitivity is based on energy, not cost. So the (intermittently) ultra-low cost of electrical energy generated by modern PV installations (where substantial overprovisioning is becoming normal) has not been taken into account.

An Agri-PV installation that produces all the fertilizer it needs from its own surplus electricity would be cool indeed.