N=Nitrogen P=Pottasium K=Potash

For new plants the mixture can vary depending on the tolerance of the plant. You can find that out from your seed breeder. Common starting mixtures are 5-5-5 10-10-10 and 20-20-20 at 1/4 strength gradually increasing to 1/2 strength. Don't give your plants any for at LEAST the first two weeks. You may notice the colydotens (Embryrotic Leaves) yellow but in most strains this is completly normal