npk ratio

F

feykns

Member
simple quetion... optimum rule of thumb ratio for flower npk ratio mostly recommended as 1-3-2
.... buuut....
does it refer to the oxide form (p2o5, k20)
or to the elemental p and k??

if the oxides, after doing the math would mean 1-1.308-1.66 => 1-1-1 elemental
 
Gemtree

Gemtree

Well-Known Member
feykns said:
thanks for the post but it leads me to even more questions... how to bring those raw npk number together with those ppm values. even if i convert the raw npk to elemental npk there is no connection... for example jacks 2-2-2 would be 2-1-2 elemental, but the ppms saying 1-1-2 ratio... what am i missing out??
Click to expand...
Think that’s all grams. Jacks is 3-1-4 and you can see it mostly matches in the first column
 
F

feykns

Member
gotcha guys... those are recipes, my bad...

i am trying find the best ratio where quality hits the most... the most recommended or proven ratios mostly aiming for yield and are low on P heavy in K...

i could figure out some keypoints i really would like to try in my next cycle.

it is said npk 1-2-1 or 1-3-2 (after conversion to elemental npk very close to each other like 1-1-1) are hitting quality and yield and that the most of us lacking P and Ca and overfeeding wih K and Mg. also recommended Ca not lower than K and Mg 1/4 of N. I'd like to give it a try.

1-3-2 would hypothetically mean in ppm
N100
P131
K166
Ca175
Mg25

and 1-2-1 would be
N100
P87.2
K83
Ca90
Mg25

those are just ratios... concentration ist adjustable.


what are your thoughts on this?
 
ProPheT 216

ProPheT 216

Well-Known Member
feykns said:
gotcha guys... those are recipes, my bad...

i am trying find the best ratio where quality hits the most... the most recommended or proven ratios mostly aiming for yield and are low on P heavy in K...

i could figure out some keypoints i really would like to try in my next cycle.

it is said npk 1-2-1 or 1-3-2 (after conversion to elemental npk very close to each other like 1-1-1) are hitting quality and yield and that the most of us lacking P and Ca and overfeeding wih K and Mg. also recommended Ca not lower than K and Mg 1/4 of N. I'd like to give it a try.

1-3-2 would hypothetically mean in ppm
N100
P131
K166
Ca175
Mg25

and 1-2-1 would be
N100
P87.2
K83
Ca90
Mg25

those are just ratios... concentration ist adjustable.


what are your thoughts on this?
Click to expand...
You are bound by how the supplier mixes it. Jacks gives you good control over nitrogen because of the calcium nitrate. But you are still bound by the fact the base is 5 12 26.

Athena gives you total nitrogen and calcium control at a much higher price.
 
N

nxsov180db

Well-Known Member
feykns said:
gotcha guys... those are recipes, my bad...

i am trying find the best ratio where quality hits the most... the most recommended or proven ratios mostly aiming for yield and are low on P heavy in K...

i could figure out some keypoints i really would like to try in my next cycle.

it is said npk 1-2-1 or 1-3-2 (after conversion to elemental npk very close to each other like 1-1-1) are hitting quality and yield and that the most of us lacking P and Ca and overfeeding wih K and Mg. also recommended Ca not lower than K and Mg 1/4 of N. I'd like to give it a try.

1-3-2 would hypothetically mean in ppm
N100
P131
K166
Ca175
Mg25

and 1-2-1 would be
N100
P87.2
K83
Ca90
Mg25

those are just ratios... concentration ist adjustable.


what are your thoughts on this?
Click to expand...
Run your P at 131 and you'll get toxicity. You only need a little P. More N, and even more K. 1-1-2 and 2-1-3 are popular flower ratios.
 
Turpman

Turpman

Well-Known Member
Jacks 5 12 26 plus calnit.
3G to 2g in 1gal.
I get 102N 41P 170 ppm.
That’s 1 to .4to 1.6
It’s my understanding all fert manufacturers list P and K as percent P205 and K2O. Which you need to multiply by % factor to get real the percent.

Now are the 1-3-2 ratios the same percent actual%. I’m guessing so.
 
Last edited:
Gemtree

Gemtree

Well-Known Member
Turpman said:
Jacks 5 12 26 plus calnit.
3G to 2g in 1gal.
I get 107N 41P 244K ppm.
That’s 1 to .3 to 2.2
It’s my understanding all fert manufacturers list P and K as percent P205 and K2O. Which you need to multiply by % factor to get real the percent.

Now are the 1-3-2 ratios the same percent actual%. I’m guessing so.
Click to expand...
You start with the lowest that goes into the others. 30-15-30 is the same as 2-1-2 (if that’s what you’re talking about lol)
 
Turpman

Turpman

Well-Known Member
Gemtree said:
You start with the lowest that goes into the others. 30-15-30 is the same as 2-1-2
Click to expand...
Yes but 15% of P2O5 is 6.45% phosphorous? Unless the companies are listing available Phosphorous. But the way I understand is it is p2o5 they are listing. Same for K its 83%
 
Gemtree

Gemtree

Well-Known Member
Turpman said:
Yes but 15% of P2O5 is 6.45% phosphorous? Unless the companies are listing available Phosphorous. But the way I understand is it is p2o5 they are listing. Same for K its 83%
Click to expand...
Yeah I saw that the second time I read it lol. I haven’t seen many that actually matched up so idk
 
Turpman

Turpman

Well-Known Member
I’m messing with an excell spread sheet so I can understand what happens when you mix different or add other stuff. Just trying to wrap my noggin around it.
 
Gemtree

Gemtree

Well-Known Member
Turpman said:
I’m messing with an excell spread sheet so I can understand what happens when you mix different or add other stuff. Just trying to wrap my noggin around it.
Click to expand...
@TintEastwood made all those recipe npk charts doing the same thing. He would know about it haven’t seen him in a while though
 
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