Why dont I ever see anyone doing this?
Maybe some do I dont know.
Mixing your desired amounts of amendments and amendments in advance to help break the nutrients down
Say 1 cup of castings and 1/4 cup amendments.
Mix that all up a few weeks in advance.
Then when top dress time comes youre going to a much more immediate impact. This would really help with dialing stuff in IMO.
I get what you’re saying.
Though I think that’s why a lot of us make teas.
The bioavailability is much more instantaneous.
I do that sometimes. I haven’t in awhile, but it works great. Plus it can be more gentle on the soil and plant if you’re using hot ingredients. Mix up a batch and feel the temp of the container over a few days while keeping the mix moist. Depending on what’s added that shit can literally get hot. Hence the term letting the soil cook.
Best method is sprinkle on top your ewc/amendment and water, no dilution beforehand.
Ewc and organic amendments come ready made, you don’t need to brew them or dilute them with anything.
My best results came from topdress and water instantly.
There’s some studies that say brewing and diluting organics in water before applying is not recommended.
This crossed my mind as well. I set up a tote with damp coir and spent pro mix, added dairy cow isopods and red wriggler Earth worms, and fed mostly Dr Earth dry mix, but added smaller amounts of crab meal and food scraps, with the assumption that we’d have more bio available nutrition for the plants after passing the mix through bug guts.
I set the bin up about 6 months ago and it’s been easy to maintain, but I’m preparing for an out of state move and don’t have any plants going at the moment. It does look like a non zero amount of the isopods left the tote and established themselves in an old dried out nursery pot away from the tote, so I’m kind of worried I may have unleashed a plague of woodlice throughout my house that has wood floors.
In hindsight I probably could have accomplished this with only spent medium and the springtails that were already there in a sealed tote.
I’ll be dumping the tote in the outside garden and harvesting the castings for a hot pepper grow this summer, which isn’t what I planned on doing with it but that’s the way she goes sometimes.
I do exactly this with all my soil grows. It works great.
You need to work it into the top layer of soil to help get it down to the root zone.
Most of my top layer is roots so I don’t touch or disturb, sprinkle and forget 
But yes if you have a somewhat tough soil mix you should work it in a lil.
Yeah this method just seems so apparent to me. Id like to run some tests on this and ill let ya guys know.
Mine too, you don’t hurt the plant buy working the dry amendments in, you can cut half your root ball off and not skip a beat.
I’ve always mixed up a cpl of batches in totes.