sir_isOanswered grow question 4 years ago I tend to use phosphorus a fair bit in the soil for rooting and then ramping up at flowering.
Others may disagree and it is a bit vague but the bias for me is like...
Phosphorus heavy early and ramping up as flowering starts..
Nitrogen heavy early-mid, ramping down as flowering starts.
Potassium early to flowering, ramping down somewhat in later flowering.