Okay, about the whole feed once a week or everyday or whatever thing.
You guys are talking apples and oranges. In soil you would never feed every day if for no other reason than you're not likely to ever need to give them water every day. It should take longer than that for them to dry out enough to need more liquid. Add in that if you're feeding full strength with every watering you're almost certainly going to get salt build up and that's why you see the "once a week" or "every other watering" philosophy when it comes to feeding plants in soil.
cres is talking about hydroponics, where you don't give them straight water except for flushing. So in essence you're "feeding" 100% of the time up to then. You don't feed hydro plants like soil plants or vice versa.
Now Advanced Nutrients formulates its nutes for hydroponics first and foremost, with the exception of Heavy Harvest, maybe another fert or two. But nearly everything they make is a hydro nute that can also do well in soil. So the soil growers have to take that into account when they're reading the feeding schedules - they're written for hydroponics and the soil stuff instructions are usually less obvious. But like most any nutrient formulated for hydro, you usually do just fine with an "every other watering" kind of thing and no further modification.
Regarding everyone sharing the "my plants each this much" kind of data I'm not going to say it isn't helpful, I just want to warn against anyone putting too much stock in that. You can grow two clones off the same plant, one under 1000w HPS and the other under CFLs and if you give the CFL plant the same dosage as the HPS plant you're either going to underfeed the HPS plant or burn the crap out of the CFL one. Plants from different strains eat differently, plants with different light eat differently, you get the idea.
We all have to dial our plants in ourselves, but this is still good info to read up on because it can help you figure out what a good starting point is.
I have noticed, though, that the pH Perfect nutes are strange in that they have a MUCH larger good range of ppm. I've had plants that looked perfectly happy at half strength, bumped them up to full strength and they still looked equally as happy, then dropped them back to half strength the next reservoir refill and they still looked happy. So the line between underfeeding and overfeeding is way farther apart with these nutes than with most others.
It's pretty hard to screw things up with the pH Perfect nutes as far as I can tell. It's like hydroponics with training wheels except you don't grow dorky plants that don't go fast or get big. As far as I've seen thus far the plants are every bit as great as I've come to expect from AN, they just made it a hell of a lot easier to do.
