When to feed in soil

I use three parts Fox Farm Ocean Forest to one part pearlite. I give no nutrients until about the 5th node, 4 weeks. I pH my water to 6.5 and I fertilize frequently. I calculate how many nutes my plant needs for the week and split it over every watering or every other watering so there is a relatively even flow of nutrients to the plant. Many other do just fine with fertilizing once a week so it's up to you. I use fabric pots which means a lot more evaporation. For the first 4 weeks or so I water every other day but once the plant gets some size I water every day. I have tried 3 (ii liter) , 5 (19 liter) and 10 gallon (38 liter) fabric pots for autos and think 5 gallon is the right size. You can use 3 gallon with good success but I got noticeably higher yields with 5 gallon pots. I got a bit more still with 10 gallon pots but I don't think it's worth the space and extra soil it consumes.

Ph at 6.5

Depends on the soil you choose. I run FFHF top half, and bottom half FFHF mixed with a left over super soil. I don’t feed through out veg, except last week to push me through the “stretch”. Then it’s bloom, Water, water, bloom. Haven’t pushed past 550ppm yet. 5th week of flower