Your best bet is just grabbing small samples of topsoil from the forests around your land, they'll have plenty of the native mycorrhizal fungi in them. Then jus

Your best bet is just grabbing small samples of topsoil from the forests around your land, they'll have plenty of the native mycorrhizal fungi in them. Then just scatter on your soil and mix in Then once they start to establish in your soils, the best ways to keep them propagating and multiplying in the soil is basically to ensure you have roots that are feeding them the sugars they need (through photosynthesis). Also you'll want to avoid tilling the soil if possible (tilling is basically just cutting through the mycorrhizal networks in the soil), but basically the key is to have crop cover on your soil as much as possible so the mycorrhizal communities have some sugar source to keep them through.