Adding NPK Values...

**owl** · 02-04-2010, 08:33 PM

just to clarify, since i am about to start feeding, i am wanting to make sure i got this right.

i am using the left over nutes my friend left me which is the technaflora lineup. i am using this with promix HP with mycorisal pro.

BC Grow 1 - 3 - 6
BC Boost 3 - 0 - 2
Thrive Alive 1 - 1 - 1
Magplus 2 - 0 - 0

so the idea is to add up each part and divide by the number of parts added in order to average out the combined parts.

i get 11 - 1 - 2.5. mind you, this for the veg cycle.

am i going along the right path?

**BeefSupreme** · 02-06-2010, 09:46 PM

just invest in a 30 dollar PPM meter on ebay and then you wont have to figure anything out. Its way easier when you can accurately measure your nutrients

**owl** · 02-07-2010, 05:58 PM

Originally Posted by BeefSupreme

just invest in a 30 dollar PPM meter on ebay and then you wont have to figure anything out. Its way easier when you can accurately measure your nutrients

nah

since im using soil, im not trying to measure out the ppm at the moment.

i am mainly wanting to figure if i have the math down regarding the nutrient values. it will be nice to know so i can log what the total average nutrient value along with how much was added with one gallon/quart.

i will certainly get ppm meters in the future for a future deep water culture setup, aeroponic setup etc. (i like to be specific when referencing "hydroponic setups")

i digress.

i am confident that the plants will tell me whatsup.

**Solcyn26** · 03-13-2010, 09:22 PM

i would really like to know the answer to this too my bloom nutes are low on n and i want to add veg to it but im not sure exactjy how to add up my npk

**Solcyn26** · 03-13-2010, 09:32 PM

here u go dude just found it

The formula is easy ........... it is:

The total of part 1 + part 2 divided by the number of parts.

I will explain: lets do the nitrogen part of the formula first.

Using equal parts, if the nitrogen value of part 1 is 1% and the nitrogen value of part 2 is 4% then the sum is 5. Since we have 2 parts we divide 5 by 2. This equals 2.5. This means if we combine one teaspoon of part 1 and one teaspoon of part 2 their combined percentage value is 2.5% nitrogen. The P and K percentages are calculated the same way.

hope this helps i know it saved my ass

**patlpp** · 03-17-2010, 10:27 PM

Originally Posted by Solcyn26

here u go dude just found it

The formula is easy ........... it is:

The total of part 1 + part 2 divided by the number of parts.

I will explain: lets do the nitrogen part of the formula first.

Using equal parts, if the nitrogen value of part 1 is 1% and the nitrogen value of part 2 is 4% then the sum is 5. Since we have 2 parts we divide 5 by 2. This equals 2.5. This means if we combine one teaspoon of part 1 and one teaspoon of part 2 their combined percentage value is 2.5% nitrogen. The P and K percentages are calculated the same way.

hope this helps i know it saved my ass

Keep in mind that even though the new solution has a solute concentration of N=2.5, you have twice as much solution.

I don't know if that was apparent or not so I thought I would mention it.

**Solcyn26** · 03-18-2010, 03:31 PM

exactly now u just add ph'd water and chech ur ppms until ur at the concentration ur looking for

**toostonedto** · 03-29-2011, 06:36 PM

Awesome thread as I have the Technaflora lineup as well.

I understand how to add if parts are equal, but I'm a little confused though when it comes to unequal parts...Technaflora's recipe for sucess calls for a 2:1 ratio of Boost to Grow. So how would I add those values?

BC Grow 1 - 3 - 6 15ml per gallon
BC Boost 3 - 0 - 2 7.5ml per gallon

**kingofqueen** · 03-30-2011, 01:36 PM

I just had the same problem and came up with this on another site:multiply the amounts (ml) with the percentages(N, P, K), add them up then divide by the sum of mls to get the final NPK.

Example:

3ml of 4-6-8
5ml of 3-1-7

3*4=12, 3*6=18, 3*8=24
5*3=15, 5*1=5 , 5*7=35

adding up N, P, K:
12+15=27, 18+5=23, 24+35=59

3ml+5ml= 8ml

27/8 = 3.4
23/8 = 2.9
59/8 = 7.4

So we end up with 8ml of fertilizer solution with the NPK 3.4-2.9-7.4

That sound the same ? Pretty sure . I had nutrients of various NPK and searched for how to calculate it . I didn't want to get the values too jacked up and didn't want to over nute .