How to use vermicompost (worm castings compost)

Having nitrogen/magnesium/calcium problems (yellow leaves with brown spotting).
Bought worm castings compost but don’t know what to do with it.
Can I just sprinkle it on top and water it in? How much should I use?
Outdoor grow, bag seed in fabric pots. Veg stage. Have not done slurry test but watering with ph 6 water.

You can top dress or make a compost tea. It’s hard to overdo it with worm castings too. If trying to supplement additional N you may want to consider chicken guano or insect bat guano as well.

I’m trying to learn about this stuff myself and wouldn’t want to lead you down the wrong path, but I have a link I could share that could be helpful to you… good luck

homesteadandchill how-to-feed-cannabis-organically

edit: removed unauthorized link

Thank you! So helpful.

Thanks! Appreciate it.