>> I am now wondering whether it would be an idea to add this to the soil in my seedling trays?
That makes sense to me, since a seed in a soilless mix is least likely to encounter the microbes it needs. And one alleged benefit of root fungi is that they provide some protection against harmful microbes.
However, their biggest benefit seems to be helping the plant scrounge water and minerals out of soil when it is dry and infertile. Thus the need for them is less in fertile. moist seedbeds or trays.
I've read that the numbers of mycorrhizae that the plant allows to penetrate its roots or connect to root hairs decreases when the plant can get enough water and minerals by itself. The idea was advanced that, since a plant supplies its root fungi with energy and some other compounds, that they are a drag on the plant unless they can "pay their way" by making scarce water and minerals more available to the plant.
The root fungi can live independently, but then they have to supply all their own energy and food from digesting organics in the soil. As far as I know, all mycorrhizae are mutualistic symbionts, not obligate parasites.
Here's another supplier of mycorrhizae:
http://www.mycorrhizalproducts...
list of species:
http://www.mycorrhizalproducts...
some references and links:
http://www.mycorrhizalproducts...
make your own innoculum (multiply existing root fungi and concentrate them):
http://www.sunseed.org.uk/wp-c...
