Mycorrhizal Fungi Application
Application rates are summarized below. The best time to apply mycorrhizal fungi is at the plant production stage, but since your plants probably didn't have that done, the next best time is at planting/seeding/sodding. This will promote contact between the fungi and plant roots.
Rub the powder directly on the root ball if possible, or sprinkle in the planting hole. For seed, mix it dry with the seed before spreading. For sod, spray it on the soil right before you lay the sod, or even better, right on the bottom of the sod (I know that can be time consuming). You could spray it on after as well.
The other choice would be to apply them to existing landscapes. This powder form is great for getting the spores to infiltrate into the soil. For turf, it is best to do this right after aerating, so that more of the spores get down to the roots. Otherwise, it can be watered in, but will not be as effective on heavy clay or very compacted soils.
The powder is fine enough to go through a sprayer, such as a backpack or handheld sprayer. A watering can will also work.
The manufacturer says for lawns, it is important to get that 1lb/5000sqft, rather than the 1lb/acre that is done when mixing with seed for agriculture. I'm not sure exactly how they arrived at this rule, but lawns are more densely planted.
It can be mixed with other microbial products and biostimulants and applied at the same time, although there is no benefit to foliar feeding with mycorrhizal fungi, as they need to touch the roots.
1lb = 700mL
Turf and Garden 1/5lb/1000sqft (1lb/5000sqft)
Planting 1-3tsp (5-15mL) per plant, rubbed onto roots
Seeding (for agriculture) 1lb/acre mixed with seed
Restoration 7lbs/acre broadcast
Water in 1.5Tbsp/G of water
With compost/soil 0.2-0.6lbs/cubic yard