NPK Math

Hydro drip setup with 600w mh in 6'x4'veg and 3000w hps in 10'x 5' flower. 2-40 gall rez in veg and 2- 70 gall in flower.

Im using 3 part GH flora series and i work hard to keep my ph at 5.8+- and my ppm at 1250, even though it got a little high in veg the past couple weeks (1400).

My veg room question is if my grow is a 2-1-6 and the micro is 5-0-1 and blend is .5-1-1 can you add them together for a total NPK (7.5-2- ?

Then when i go 12/12 and i add bloom (0-5-4) and boost (0-10-10) do i keep doing the math (7.5-17-22) ?

I see that UB says that a 9-3-6 in veg and a 10-30-20 in flower are a good average NPK.

I might have gotten a little nute burn a week ago but now i wonder if im getting enough N in veg and enough P in flower.

NO, not really, ONLY if your using equal amounts of those nutrients and I'm sure your not.

2-1-6 is the percentage of nutrient in the bottle. But when your base nutrient is diluted in pure water (say 30ml per gallon) then it becomes the RATIO of nutrients in the solution. The percentage is now VERY LOW because it was diluted.

NPK of solution = (N or P or K of nutrient X ml nutrient used) / Gallon (3785ml water)
%N = (2 x 30ml)/3785ml = .0158
%P = (1 x 30ml)/3785ml = .00792 <--- Notice the 2-1-6 RATIO
%K = (6 x 30ml)/3785ml = .0475

Now you have the NPK of solution (.0158-.00792-.0475)
Notice the values are tiny just like plant foods that don't need diluted.
If you add Micro at 30ml / gallon you could do the math the way you did in your question but if you add ANY OTHER AMOUNT you need to account for that in the math

So the micro is 5-0-1

Assume you use 5ml of micro

%N = (5 x 5ml)/3785ml = .0066
%P = (0 x 5ml)/3785ml = .000 <----Notice the 5-0-1 Ratio
%K = (1 x 5ml)/3785ml = .0013


Now you can add up the % values. (Note: I have not done the third Nutrient but if you do you can add that number as well)
Total N= .0224 / Total P = .00792 / Total K = .0488
*You can think of this as (2.2 - .79 - 4.8 or (4.4 -1.4 - 9.6) because its the ratio of N to P to K that is important (*as long as you know you ppm)

What you will find is nutrients that you only use small amounts don't change NPK
very much...Notice the micro is N = 5 and the Base is N = 2 so you might think the micro has more N (which is correct) but since it is used in a smaller amount it's N contribution is actually MUCH lower .0066 < .0158 and therefore has a minor affect on NPK of solution.

Explained well. Thanks man.