Particularly technical question :)

I've seen a bunch of helpful posts regarding NPK ratios for veg and flower cycles. I'm landing on something like 1:1:1, and 1:1:2, respectively, with about .5 Ca, .3 Mg, and .2/.3 S

My questions is if anyone knows specifically whether or not people are referring to actual P and K, or P2O5, and K2O. A fertilizer label is giving % actual N, but not actual P and K amounts. Actual K = ~.83 of stated K2O, and actual P = .43 of stated P2O5. Gotta be careful when reading popular literature. It's designed for the average person, and these days, that ain't a very high bar.

Pretty sure people are saying P when they're technically referring to P2O5. There is a difference of more than a factor of 2, so it matters. For K, it's a small difference (.83 is pretty close to 1), but for P, it's much more significant (.43 is alot less than 1). If people are actually referring to P, that would help explain why so many bloom fertilizers are so high in P2O5. To get 4% P, you need 10% P2O5. Most seemingly technical things I've read suggest P ppm should be shockingly low, something like 20-40% of what actual N is!

In any event, the message seems to be that excessive P is bad, and to back off, especially given how many "bloom" fertilizers are very high in P. Having as much N as P during all phases of cannabis growth (except the very end/flushing time) seems smart

dirt or hydro? the difference applies if in dirt or hydro... there's no 'O' in dirt. and i definitely want 'high' P during flower. the nutrient analysis and ratios most people and the industry talks about are the raw numbers... and the target ratios for weed will be different depending on who you talk to... there is no gospel for the 'correct' ratio. grow it the way you want if you are happy with the result. if not; change what you are doing. have you researched hydrobuddy? any interest in dry nutrients like from places like hydro-gardens...? in case you are looking to change what you are doing even if you are happy with it... and step further into the science...?

i feel like ive looked this up before but totally forget. Something like they list the percentage on package as P2O5 and K2O butt he percentages are of P and K I dono. Looking at the NPK vs percentages on bottles leads me to belive the percentages is of P and K. In hydro it seems pointless to worry about P ratio becasue you need pH down.