Hello
@Majin ! There are liquid nutrients that are organic too despite what some people say ( they are just people who don't understand what these organic liquid nutrients are and how they are made, so they demonize them and calling them bad, toxic, not true organic and stuff ) and no liquid nutrients will not kill the beneficial microbes. These microbes to die they need repeatedly high doses of synthetic fertilizers. The mycorrhiza should be used from day 1 because you want the fungus's to find a sterile root system so they can colonize it easily without competition. Once the mycorrhiza is established you don't have to use it again. Also for the first 2-3 weeks it is better to not use any microbe products because the contain trichoderma harzianum. This kind of trichoderma attackes at fungus spores unless the product of mycorrhiza that you are using it has propagules instead of spores ( but have in mind that products with spores are always better than propagules ). Happy growing ! 👊