Whats the better NPK value for flowering?

[dazzerx2000]

Hi everyone,

As the title states which is the better dry chemical fert blend for flowering 12.5-25-25 or 15-15-30 in regards to cannabis would the plant consume more Potassium(K) or Phosphorus(P). Thanx.

 

[stoned-trout]

I wouldn't use either one man

 

[dazzerx2000]

how come s-t can yo shed some more light on you reply is it the high levels?

 

[Jonhx69]

Find something like 3-2-4, or between your options which have more potassium.

 

[dazzerx2000]

Find something like 3-2-4, or between your options which have more potassium.

thanx for the reply 3-2-4 wooowh thats a hell of allot of water in that bottle, the NPK values ive stated are for dry ferts the same stuff they use in so called professional bottle like canna bcuzz ect just without the water and further dillution ect, i understand its easyier to burn plants with such high NPK values but if you know what your doing and feed sparingly like once per week all is well.

Allot of people on here use jacks dry ferts and there equally as high, i was asking my question to see what would be the best formula out of the two for cannabis flowering either the one with more potash or the one with both high potash and Phosphorus, im going to go with the 12.5-25-25 and feed them that at harf strength once a week for 3days then plain water with macros and additives for the remainder of the week.


Just for more information my veg npk is 25-15-15+macros produces stupidly lush growth

 

[Joshua Ntr]

In ppms 100-62-120-180-60

 

[Drek]

Daz,

Imo, the lower the concentration the better. ie: 4-2-2

It's really easy to burn things up with too high of concentrations.
ie: 20-20-20

 

[dazzerx2000]

Daz,

Imo, the lower the concentration the better. ie: 4-2-2

It's really easy to burn things up with too high of concentrations.
ie: 20-20-20

True words it is easy to overdue things. Although 12.5-25-25 will be whats going in the tank ill only use max E.C 1.4 and watch them. Ive got tons of canna aqua A+B that stuffs got a low NPK value if things appear to be suffering ill switch back to them and write the experiment off.

Tons of people use dry ferts with success and they always seem to have high npk values i guess its just the nature of dry ferts, but i guess theres a low margin for error with them. Although i have a low post count here ive been growing for 10yrs (continuous) now, and am moving into my 11th i think its time to dabble and learn again.

By moving to these dry ferts ill be paying £4.60 per killo as apposed to £45 per 5lt of watered down A+B and due to the ferts being dry and less chance of the elements bonding! ill be gaining a high amount of macros in the mix as a plus...........meaning i can drop two bottles from my feed lineup mainly calmag+ and any PK boosters

that alone warrants a try.

 

[Nifty_PoT]

I would suggest reading the thread about mixing your own from scratch if you have not.

Use hydrobuddy and work in elemental ppm's to keep it simple . You want something like 130-50-200 N-P-K elemental roughly , Potassium can vary between 200-260 in my experience ,witth very good results .

Lower P being better for veg and preflowering and then you could up P in full flower if you wanted , there are growers that run low p all the way through the grow , it depends on what medium you grow in ect.

 

[dazzerx2000]

Thanx Nifty interesting ill take a look

 

[Snow Crash]

It's more about ppm's

Take the percentage. Multiply by ml or grams used per gallon. Then multiply by 2.654. This is a rough estimate of your minimum guaranteed ppms.

In flowering I prefer:
N - 80 to 120ppm
P (as P2O4) - 90 to 140ppm
K (as K2O) - 180 to 300ppm
Ca - about 10ppm less than N
Mg - 40 to 60ppm
Su - 60 to 100ppm

 

[Dkgrower]

If its a choice between the 2 i would take the 15-15-30 and i bet you properly do just fine

 

[UNREGISTRD]

It's more about ppm's

Take the percentage. Multiply by ml or grams used per gallon. Then multiply by 2.654. This is a rough estimate of your minimum guaranteed ppms.

In flowering I prefer:
N - 80 to 120ppm
P (as P2O4) - 90 to 140ppm
K (as K2O) - 180 to 300ppm
Ca - about 10ppm less than N
Mg - 40 to 60ppm
Su - 60 to 100ppm

Exactly...He needs to come up with his own nutrient Formulation...

 

[dazzerx2000]

It's more about ppm's

Take the percentage. Multiply by ml or grams used per gallon. Then multiply by 2.654. This is a rough estimate of your minimum guaranteed ppms.

In flowering I prefer:
N - 80 to 120ppm
P (as P2O4) - 90 to 140ppm
K (as K2O) - 180 to 300ppm
Ca - about 10ppm less than N
Mg - 40 to 60ppm
Su - 60 to 100ppm

Exactly...He needs to come up with his own nutrient Formulation...

True true formulating your own mix is definitely the way forward but abit time consuming with a learning curve as well these mixes are used for professional fruit and vegetable growing although not cannabis specific wink wink. Ill see if i can find a better break down of whats in the box as ive not received delivery yet.

High potash feed is:

Analysis NPK Fertilizer 12-12-36 Containing Trace Elements
Nitrogen 12.0%
Nitric Nitrogen 10.0%
Ammoniacal Nitrogen 2.0%
Phosphorus Pentoxide (p2o5) Soluble In Neutral Ammonium Citrate And In Water 12.0% (p5.3%)
Phosphoros Pentoxide (p2o5) Soluble In Water 12.0% (p5.3%)
Potassium Oxide (k20) Soluble In Water 36.0% (k29.9%)
Magnesium Oxide (mgo) 0.1% (mg0.06%)

Trace Elements (*chelated By Edta)
Boron* (b) 0.01%
Copper* (cu) 0.02%
Iron* (fe) 0.04%
Manganese* (mn) 0.02%
Molybdenum (mo) 0.0002%
Zinc* (zn) 0.007%


Couldnt find the low nitrogen mix numbers but itl be the same as above just with 12.5-25-25 being the focus.

If its a choice between the 2 i would take the 15-15-30 and i bet you properly do just fine

Hi DK, why would you pic the high potash 15-15-30 over the other do you think the marginally higher N and lower P would be better?


Thank you all for the continued support.

 

[Dkgrower]

basically Yes, you properly feed them to much P and that is more an water pollution-enviromental issues... The plant dont care in those amounts and the higher amount of K is important in flower so is Nitrogen...

Again i bet you do just fine with those ratios..

The only issues i see could be extreem green plants that need an longer flush periode but in water - you can perform those type of actions pretty rapid. Also some indica leaning crosses are so good at nitrogen uptake and storage that you might want to go alittel lower EC wise on that side of the spectrum and more high EC with sativa leaning hyper vigor type crosses, that is some thing you have to tweek strain pr strain

Just to be sure, what medium are you going to grow them in ?

 

[Snow Crash]

No need to get custom.

1g per gallon of the 12.5-25-25 would be pretty hot. Definitely too much Phosphorus.

1g per gallon of the 15-15-30 would be really hot. Definitely too much Potassium.

1/4g (250mg or ~1/4tsp per 5 gallons) of the 12.5-25-25 and 1/2g (500mg or ~1/2tsp per 5 gallons) of the 15-15-30 would be very close to my ideal ppm range. Goldilocks style, not too hot, not too cold.

 

[dazzerx2000]

basically Yes, you properly feed them to much P and that is more an water pollution-enviromental issues... The plant dont care in those amounts and the higher amount of K is important in flower so is Nitrogen...

Again i bet you do just fine with those ratios..

The only issues i see could be extreem green plants that need an longer flush periode but in water - you can perform those type of actions pretty rapid. Also some indica leaning crosses are so good at nitrogen uptake and storage that you might want to go alittel lower EC wise on that side of the spectrum and more high EC with sativa leaning hyper vigor type crosses, that is some thing you have to tweek strain pr strain

Just to be sure, what medium are you going to grow them in ?

I used to used to do hand watered coco with afew bottles you know the drill 5-1-8 A+B, silica, PK9/18 ect ect.........

but now ive moved onto modular flood and drain pots with 60/40 mix of coco and clay pebbles seems to work the same, less control over plants indvidually but self watering and the cocogives me some redundancy if i cannot check on the grow as much as i would like. Which seems to be more so nower days.

No need to get custom.

1g per gallon of the 12.5-25-25 would be pretty hot. Definitely too much Phosphorus.

1g per gallon of the 15-15-30 would be really hot. Definitely too much Potassium.

1/4g (250mg or ~1/4tsp per 5 gallons) of the 12.5-25-25 and 1/2g (500mg or ~1/2tsp per 5 gallons) of the 15-15-30 would be very close to my ideal ppm range. Goldilocks style, not too hot, not too cold.

Thanx Snow Crash ill be starting the plants off on ec 1.0 and stepping them up slowly to a max of 1.6 late on into flower also less they show signs of needing it they will be only fed for three days per week then the res will be dumped and changed for water with macros @ec 0.8 just to take the sting out of the plain water.

all of above is open for adjustment depending on what the ladies tell me is going on.

 

[fedoreat43o]

In ppms 100-62-120-180-60