I have a grow box set for hydroponic with autoflower AK-47 seeds and was reading the Autoflower-Growing-Book by Midowo and as a result have a couple of questions regarding nutrients. The growbox was commercially produced and came complete with instructions and a supply of nutrients. The nutrients are: A (5-0-6) and B(1-5-4). The book talks about reducing nutrients for autoflowering plants by 50%, do I understand that correctly? Then it refers to nutrient compositions that I don't see how to do, such as, "That is why in this stage Phosphorous and Potassium are needed in higher concentrations than nitrogen, and a fertilizer with 5-15-10 N-P-K ratio is required." How would I do that given the composition of A and B ??