I usually dust seed holes with Wallace brand endo-mycoryzal and xtreme gardener Azos which is a nitrogen fixing bacteria like @MomOnTheRun mentioned.
side note you can also get nitrogen fixing bacteria from properly made compost, so if you make your own or buy some you should have them in the soil. The fungal side is a bit harder to get because there’s only one strain of endo that forms a relationship with cannabis. But fear not, you can always make more bought endo fungi following or adapting the link Books, PDF's, and other useful nerdy sh#t - #34 by DavesNotHere