The feeding schedule for soil is going to be overgeneralized at best. "Soil" is such a vague term, horticulturally, that it's impossible to say for certain how much you should feed.
It's much easier in a hydroponic setting because you know the growing media starts at zero nutrition. How much "food" is in your soil? Hard to say without doing some measuring.
In general a quality soil will have enough nutrients in it to get your plants through veg, though some supplements may help things out. If the soil is poor or the veg particularly long you may need to feed a bit later on.
If your soil has time-release fertilizer mixed in (Miracle Grow soil usually does) it can be especially tricky to feed without overfeeding.
I usually recommend feeding at about half strength compared to what you'd use in hydroponics, and alternating between pure water and feeding each time the soil dries out enough it needs more water.
You should definitely measure the run-off for pH and ppm to see how things are. If the ppm is really high or the pH is way off you'll have to adjust the next water/feeding accordingly, or potentially flush right away with additional water to prevent overfeeding if the run-off is dangerously strong.
That's all for containers, of course. If your plants are growing in the ground I would recommend a dry fertilizer like Heavy Harvest or something because liquid ferts tend to get washed away if it rains.