Start with 1/4 strength every "fertigation." Slowly up it every week until full, unless it's a auto then work up to half strength.
You want to fertigate at least 3 x's a day and it doesn't matter if the coco is still moist/wet it should be.
I use a 3 part nutrient called Master Blend designed for growing tomatoes. The basic nutrient MB plus epsom salts and calcium.
There are several different mixes for weed but I stick with what is the simplest and for me I make a 1 gallon concentrate of each: 80 gms of both MB and calcium and 40gms of epsom, each in their own gallon bottles. To mix fill a 1 gallon container (I use 1 gal milk, juice, water bottles) remove 1 1/2 cup and add 1/2 cup MB, 1/2 cup epsom and 1/2 cup calcium - IN THAT ORDER which gives you 1 gallon of nutrient water at FULL STRENGTH. So 1/4 of each would be half strength, 1/8 cup quarter strength etc.
Regular seedlings get water fist week
Wks 1-3 quarter strength
Wks 3-5 half strength
Wk 5-flip full strength
Flip fill MB & epsom, no calcium
For autos I half these amounts.
When fertigating your plants 3 x's a day you'll want to add enough water every time that you have at least 10% run-off (out the bottom of the pot).
If you want to grow trees in small containers and fill your storage containers with bud learn how to do this
View attachment 2185702
The above plants are in 1 gallon fiber pots.
The only drawback of this type of growing is the waste water. If you have a lawn or garden beds or trees it's easier to deal with but if the sewer is the only option it's still worth it.