The npk of my nutrients is 1-2-2, and it says to use 7mL per quart, and i have a phosphorus deficiency, so how much of this should i give the plants, and how often should i give it to them
Much more INFO needed like.
What you growing in soil wise firstly.
Pictures speak a million words
Is it seedling
Is it in veg
Is it in flower
You need to give us more information for anyone to give help
i know one thing 1-2-2 is pretty weak. if that's what your using I'm assuming your
1. in a very good super soil or
2. have very weak lights. the more light the more nutes.
I also wouldn't suggest giving them more of your base fert to correct a deficiency. if everything else is fine they have plenty of nitrogen already. give them more you may fix the deficiency but become victim to nitro toxicity. also keep in mind when a plant has to much of one thing it can effect how others are taken up. example if I remember correctly to much iron makes it hart to get its zink. maybe its the other way around. anyway just don't give to much of anything.