Adding npk values

[Josh]

I was really confused not too long ago, and I definitely had the wrong idea to figuring up my numbers

https://oaksterdamuniversity.com/combin ... -k-ratios/

I use the the GH flora series in coco along with cal/mag supplement, so my total npk for early flower is 2-1.6-3.1

Example-

Cal/mag- 2.5 ml
Micro- 2.5 ml
Grow- 1 ml
Bloom- 2.5 ml
Kool bloom- 1 ml

Total ml of nutrients per gallon= 9.5 ml

Take amount you're adding per gallon and devide by total ml

So my cal/mag is 2.5÷9.5=0.26 rounded up to 0.3 ml/gallon
The npk of my cal/mag is 1-0-0, so just multiply each of those by 0.3

So the npk of my cal/mag (2.5 ml) works out to 0.3-0-0

Do this for all additives and add the npk values to get your total



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[GMO]

Im not sure thats right dude

you need to x them NPK of the nutrient added by the volume added to get the mg in the solution then you can use this ratio of dissolved nutrient and divide that into the total water volume

so 2.5ml of 1-0-0 is like 250mg of N. 250mg is always 250mg so you divide that number but the water volume of 3785.41ml is 0.006mg per Ml of water.

i think i may have confused myself in the process here. but something that would be a great talking point :D

[Josh]

Im not sure thats right dude

you need to x them NPK of the nutrient added by the volume added to get the mg in the solution then you can use this ratio of dissolved nutrient and divide that into the total water volume

so 2.5ml of 1-0-0 is like 250mg of N. 250mg is always 250mg so you divide that number but the water volume of 3785.41ml is 0.006mg per Ml of water.

i think i may have confused myself in the process here. but something that would be a great talking point :D

"you need to x them NPK of the nutrient added by the volume added to get the mg in the solution then you can use this ratio of dissolved nutrient and divide that into the total water volume"

I used the recommended doses on the back of the bottle to figure out the ratio per gallon instead of doing the math per ml. Your way looks way more precise though for sure

For example, the maximum dose for bloom in flower is 15 ml/gallon. My dose is 2.5 ml. So I took 2.5÷15=0.16 rounded up to 0.2

So this means my dosage is 20% of their recommended dose, correct?

So the total npk I'm adding with the bloom would be 20% of 0-5-4, which is 0-1-0.8 per gallon

I guess I'm assuming that their npk ratio is based on full strength dose per gallon, I should prbly call someone and confirm though.

But I faintly remember you saying something like" they base the npk ratio on a certain amount of nutrients per 1000 ml of water maybe??



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[GMO]

i hate us gallon LMAO

[Josh]

i hate us gallon LMAO

Racist!!!

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[Josh]

I hate to drag this discussion on man, I just feel like it's something so important that I can't wrap my mind around

I think understanding these ratios will unlock a whole new realm for me when it comes to saving money and keeping plants healthy

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[weedabix]

If I may add to this, the way I understand it is similar to GMO's: the ratios in NPK refer to actual percentages in the liquids you buy, so if you have a litre, and an NPK label of 1-0-0, you'd have 10g (=10,000mg) of nitrogen in there (it's a bit trickier for P and K but that doesn't matter here). So if you put 1ml of that into a litre of water (or rather 999ml), you'd end up with a concentration of 0.01mg/l. So you could interchage that with gallons: 1ml of your calmag in a gallon gives a concentration of 0.01mg/gal. So in the end, you can just add up your concentrations.
If you want to write that as N-P-K values again, you'd have do divide it again.
0.01mg/gal is about a quarter of the concentration of having it in a litre (i'll stick to that to make it easier) so 0.01mg/gal is roughly 0.0025mg/l which would be a percentage of 0.0025 and you'd have to write for that solution 0.0025 - 0 - 0.
This is not very practical I admit. One thing that would make it easier is to write it as ppm 1% is 10per thousands which are 10,000 ppm, so 0.0025mg/l are 25 ppm.

Now what is practical for you:
I would just add up all the N-P-K's multiplied by the milliliter you use per gallon (or per litre if you want to switch sides ;-)) and just stick to it!

I am sure I made some horrible mistakes in here - please correct me and then forget about it, I hope you get what I mean!

[weedabix]

Just looked at that oaksterdam page - what they are referring to is what I meant - e.g. you take
2 ml of 1-0-0
1 ml of 3-1-1
and 3 ml of 4-1-5
that would give you (2-0-0 + 3-1-1 + 12 -3-15)/6= 17-4-16/6=2.8-0.7-2.7
but that's without diluting it!
but if you only care about the ratios and in the end you're measuring your ec anyways and you roughly know how many ml you need for that, you can just remember that you put 17-4-16 in a gallon. The ratios will stay the same and you don't have the hassle and also you don't have those ugly rounding errors!

[Josh]

Just looked at that oaksterdam page - what they are referring to is what I meant - e.g. you take
2 ml of 1-0-0
1 ml of 3-1-1
and 3 ml of 4-1-5
that would give you (2-0-0 + 3-1-1 + 12 -3-15)/6= 17-4-16/6=2.8-0.7-2.7
but that's without diluting it!
but if you only care about the ratios and in the end you're measuring your ec anyways and you roughly know how many ml you need for that, you can just remember that you put 17-4-16 in a gallon. The ratios will stay the same and you don't have the hassle and also you don't have those ugly rounding errors!

Thanks mate, I think this does help a lot. We're all just getting the same answers but just finding different ways to get there. Lol

I like the way you're thinking though, msles it much easier.

Ok..... Help me out here. Hahaha
I'm take a pic of my math, please double check for me

So I just do the math for all nutrients, then add the total.

So I'll get the npk per 1000 ml of solution doing it this way correct?

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[Josh]

Easier to just do the undiluted values like you said, so my current npk is 17-23.5-31 UNDILUTED

So say I want to mix up 5 gallons of water, do I just devide each value by 5 to find the actual ratio?
So I'm thinking at the rate I'm adding per gallon-

Cal/mag- 2.5
Micro- 2.5
Grow- 1
Bloom- 2.5
Koolbloom- 1

That gives me an npk of 3.4-4.7-6.2 per 5 gallons of solution?

Cal/mag= 1-0-0
Micro= 5-0-1
Grow= 2-1-6
Bloom= 0-5-4
Koolbloom= 0-10-10

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