[siftedunity]

I wonder why canna has a low amount of k in their coco nutrients?

[Absolem]

Originally Posted by siftedunity

I wonder why canna has a low amount of k in their coco nutrients?

Coco coir degrades at a constant rate and releases 30-50 mg/l or 30-50 ppm of K for the plants to use. I think they over estimate how much K the coco will release and add to the nutrient profile. That's why Canna doesn't want people cutting their coco coir with perlite because the more coco coir you remove and replace with perlite means you are cutting down the K levels even more.

[siftedunity]

I see..
I did want to post my old advanced nutrient ppms but I kinda feel its a bit off topic. I had great results with it even though the numbers are no where near heads or cannas. will post it anyway for conversations sake.

[siftedunity]

sensi bloom A + B @ 8ml per gallon (4L)
5-4-8 ( A= 3-0-0 b= 2-4-8 )
Nitrogen (N)

.............................. ...........with bigbud:

Total nitrogen 117 ppm ........ N 117
phosphorus(p) 41 ppm ......... P 50
Potassium (K) 154 ppm......... K 207
Magnesium (Mg) 14 ppm........ Mg 14
Sulfur (S) 9 ppm................... S 9
Calcium (Ca) 49 ppm.............. Ca 49








have had problems with N toxicity recently but for years this formula has worked very well prior to the issues.

[repuk]

Originally Posted by Absolem

Yes. If your full nutrient strength is 1.5 EC feed around 1.1 EC for the first week after transplant.

note taken, thanks!

Originally Posted by Absolem

Yeah, I should have noted that adding Canna P/K 13 during flowering weeks 2-5 will increase the total P to 79 ppm and K=165 ppm. I only gave how many ppm's Canna P/K 13 would add.

12/12 Weeks 2-5
Canna A/B 8 ml/gallon...Yara SOP 52 1/4 g/gal.....P/K 13.....Total
N..........121................ ...........0.................. ...........0.........121
P............42............... ............0................. ............37........79
K...........60................ ...........28................. ...........77.......165
Ca.........98................. ...........0.................. ............0.........98
Mg........33.................. ..........0................... ............0.........33
S..........15................. ..........12.................. ............0.........27

A lot of good info on P in this thread.

https://www.icmag.com/ic/showthread....th+high&page=6

Understood

Originally Posted by Absolem

Canna by itself has really low K. When I ran Canna's nutrient profile I had some problems too. I added more K and the problem went away. That's why I recommend adding the Yara SOP 52 to correct the low K in Canna.

I found how to source it! 25Kg (about 1€/Kg) but will also use it on the orchard. I guess to ease things you can dilute it in water for easier dosage (measuring ml's instead of grams at mixing time?)

Would you'd better use a Yara salt product instead of Canna's PK 13/14?

[sethimus]

Originally Posted by Absolem

Coco coir degrades at a constant rate and releases 30-50 mg/l or 30-50 ppm of K for the plants to use. I think they over estimate how much K the coco will release and add to the nutrient profile. That's why Canna doesn't want people cutting their coco coir with perlite because the more coco coir you remove and replace with perlite means you are cutting down the K levels even more.

so if i'm using mills coco and cork (50% cork) i should rather increase my K?

i'm asking because i tried heads formula and i only had sub par results. since i switched to peters 3-2-1 formula (substituted with hakaphos 4-12-26) my plants are thriving, but my K levels are more than the double amount of N and my Ca levels are 3/4 of the K level, looks like that formula works better with this substrate

[siftedunity]

seth.. this is my question.. I was using a nutrient combination with double the amount of K in the mix than N. and yet didn't have any issues that looked specific to K toxicity.

[Absolem]

Originally Posted by sethimus

so if i'm using mills coco and cork (50% cork) i should rather increase my K?
co
i'm asking because i tried heads formula and i only had sub par results. since i switched to peters 3-2-1 formula (substituted with hakaphos 4-12-26) my plants are thriving, but my K levels are more than the double amount of N and my Ca levels are 3/4 of the K level, looks like that formula works better with this substrate

Hello,

I really don't know much about cork as a growing medium. I'm guessing it has good porosity but lacks in holding water like coco coir or peat. Cork should be quite inert unlike coco or peat.

I like your nutrient profile for that mix with the increased K. 100% coco coir requires less K and more Ca as seen with Canna or H3ad's nutrient profile.

How fast do your containers lose moisture until you feel like you have to water again?

[sethimus]

Originally Posted by Absolem

Hello,

I really don't know much about cork as a growing medium. I'm guessing it has good porosity but lacks in holding water like coco coir or peat. Cork should be quite inert unlike coco or peat.

I like your nutrient profile for that mix with the increased K. 100% coco coir requires less K and more Ca as seen with Canna or H3ad's nutrient profile.

How fast do your containers lose moisture until you feel like you have to water again?

i water about 1,6l each day, over 2 cycles in 12l pots:



(i increased the vpd yesterday, to increase transpiration)

[sethimus]

my actual feeding looks like this:

PPM Total PPM Nitrogen Total (N) 109,36 Phosphorus (P) 75,25 Potassium (K) 229,78 Magnesium (Mg) 56,36 Sulfur (S) 131,75 Calcium (Ca) 141,49
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with 7,5g Hakaphos Basis 4, 5g Calcinit, 2,5g Epsom and 1g MKP per 10l of 50/50 ro/tap water (around 0,3 EC) for a total of 1,5 EC