Perfect blend also has most micros added as chelates too. And has many beneficial bacteria.
I cant find the 999 perfect blend anymore in my area. But the 444 i always have a bag for general purpose.
Its far more effective than pelletized chicken manure with same numbers.
I use it as a top dress in full term and with potted plants im holding till transplant. Especially good in the nursery. Ill make a tea with it or add it to my tea mix just to change food sources for the plants, usually im in a pinch, i forgot to buy another part of my tea and use perfect blend instead.
I cant find the 999 perfect blend, but I used to mix the 999 into soil prep for my full term.
Every season, for full term beds, rows and smart pots I add bio-live, glacial rock dust, worm casts and high nitrogen+high phosphorus sea bird guano for my bagged ferts. But also add lots of horse manure and rabbit manure, compost and alfalfa pellets. Till it in, water it for a few days then plant. If brand new soil, or a new spot ill add a 1/4 cup of mycorhyzzae to hole before putting in plant. Its from a 50# sack of mycorhyzzae granular not powder, not great white, orca or mykos brand. Ill use those in my teas as they are powdered.
I top dress with dolomite, k-mag and epsom salts monthly during full term.