Hey friend,
So i think it's open to interpretation, that's why there isn't a lot of specific guidelines like indoor.
I've done grows where i top dress the dry amendments once a week or once every two weeks and then it breaks itself down into the soil with every watering. It worked well for the most part.
Then I've done liquid nutrients and when i do that i have my days of plain Ph'd water, and then the days where i feed i just mix up all the water i need with all the nutrients and soak each pot entirely. Either using a 3 gallon bucket or a 5, but you can always do 1 gallon especially if you notice one plant is needing more or less of something than the others.
Rain water is so good for plants, so don't let that disrupt your schedule unless it's been raining so much for many days to where the soil is basically all wet. Because then you might end up over watering. But definitely take advantage of rain when you can. It's higher in oxygen and helps free up many micronutrients. 👍