Shit will make them grow faster. You just have to choose your shit carefully! Composted shit is better than raw. Near-fossilized shit is better still! Mmmm bat guano. The shit of an herbivore is far preferable to the shit of a carnivore. Seedlings don't like shit much, and it's too intense for them. Flowering plants like bat shit and growing plants like sheep shit.

Who DOESN'T love shit?

Most soil fungi you can physically SEE are actually just part of your rhizosphere. One way to approach the 'problem' is to give BENEFICIAL fungi (known as mycorrhizal fungi and sold under trade names such as mycostim) that you know are just breaking down organics inthe soil and making them available to the plants. In fact, if you grow organically and give SHIT for food, you are shooting yoursefl in the foot by NOT having enough soil fungi!