It's like a fucking race to the bottom with you people.
Listen to Ben, look at his avatar for fuck's sake, he knows what he's doing.
Why on earth do you guys think that Cannabis is the only annual that you can disregard the foliage on? I mean seriously. Would you consider your tomato plant healthy if all the leaves were yellow right before you were about to harvest tomatoes, no. How about you basil, you want yellow basil leaves? Cannabis is no fucking different.
I can understand being mad that you wasted a shit ton of money on a useless product, but don't try to rationalize it and take it out on those who are trying to help you. Does 0-39-25 even sound good to anyone? That's ridiculous. Of course the guy who works at the store selling it is going to tell you it's a good product, why wouldn't he?
I don't know if you know who Mel Frank is, but he's a pretty important guy in the Cannabis industry. He says that through all stages of growth your K (third value) should be twice that of your P (second value). There's science behind this reasoning too. Dumping a whole bunch of P (anion) in your medium is going to lockout a bunch of the beneficial cations, such as Calcium, potassium, sodium, magnesium, iron, ammonium and hydrogen, you want to grow a plant without those nutrients? Hopefully the answer is fuck no. Here's the kicker too, if your plant cannot absorb all of those micro, and one macro, nutrient, then it won't be able to use any of the P it's absorbing either.
Sorry to get a little agitated, but come on. Think before you post.