You can also bake(1 hour at 400F) or boil the soil(10 min) to speed the process up. This oxidizes the NH4 and organic matter just like the bacterial 2-3 weeks method.
When using richer manures etc, we boiled it first to reduce the NH4/OM.
This works well for all soils.
It removes the part that makes it variable and problematic in initial set up phase(first 1-2 months)and generally where folks might fail.
With "Mud cubes", a suggestion from a Kiwi some years ago, you do not need to boil/bake oxidize etc since the relative volume of OM and NH4 is small and the tank is well established by that time you need to redose.
I suppose if you added a lot of them..............but most spot fertilize with them.
Most tanks can handle a fair amount of NH4 and organic matter(OM).
But in new tanks, low plant biomass, poor plant growth/poor plant species choices and overloading tanks etc, you can exceed that.....then you get problems and algae issues.
The trick is to keep things in favor for low as possible NH4 and in favor for higher O2 levels. A balanced fish load, lots of algae herbivores and no water changes.
Later, you can add some GH booster, traces, perhaps some KNO3/KH2PO4 as very very small amounts once a week or two to relieve any slight limitation.
This is easy to do(you under dose every time and then only when the plants start to get wimpy) and allows more species to be kept together without some hogging all the nutrients.
It also allows you to get far far more out of the sediments and have them last longer.
It does not add that much complexity to the method but you get a significant gain, so it's a very fair trade off.