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A question for the growers using Jacks 5-12-26

eric2028

Well-known member
Veteran
I spoke with someone from jr peters and got some cannabis specific directions I d like to share.

Great starting point or basic recipe:
Jacks 5-12-26 3.68 grams/gallon
Calnit 2.43 grams/gallon
No more then 1 gram epsom salt per gallon if needed. So this is close to the 321 everyone talks about.

Stronger recipe for hungrier plants/ enriched environment.
Jacks 5-12-26 5.66 grams/ gallon
Calnit 3.02 grams/gallon
Total ec was 2.61 with ph of 5.7

Also jacks blossom booster 10-30-20 is recommended for specifically the first 2 weeks of flowering.
Figured I d pass along the info.
 

Big_Al's_Buds

Active member
promix count?

Are you running in Promix?

I just started back up after 3 years off.. Still have my jacks left over from last time.

A few issues and looking for advice.

I use promix, always have. Last time I was using RO, feeding at around 400ppm (.5) all the way through. 1/.67 measured my ppm. PH would fall around 5.8 - 6.1

Always had super healthy green leaves and a great yield and product.

Now with no RO, tap is around 130ppm coming out and starts at 8.4 PH. I am trying all different combos, strengths, PH, and still getting issues.

I have 18 plants of 5 strains from seed, just took 100 clones this morning in a pheno hunt.

Most plants have some sort of issue, one haze strain is showing calcium, another hybrid is showing mag, my WWxBB cross stems are so purple they are almost black, its crazy. Then my 2 short indicas are perfect.

I have always grown out seeds as I dont have access to clones, and last run 3 years ado had 40 seeds from 10 strains, all were perfect.

I cant figure out what I am doing wrong here? Could it be the tap water? Could it be the T5 lights for 6 weeks old plants arent strong enough? (8 bulb fixture). My environment is pretty good usually around 75-77 and 50-55RH.

After reading this whole post, and seeing some others pictures they seem to have the same problems.

Any suggestions?
 

Budley Doright

Active member
Veteran
Regardless of what you used to do.... there really isnt anyone who feeds that low.....

Most feed at a minimum of 1.2 ec ......

I have not read this thread lately...but I suspect you wont find anyone feeding that low and they tell glowing reports how great their plants are...
 

Big_Al's_Buds

Active member
Regardless of what you used to do.... there really isnt anyone who feeds that low.....

Most feed at a minimum of 1.2 ec ......

I have not read this thread lately...but I suspect you wont find anyone feeding that low and they tell glowing reports how great their plants are...

Yes I saw that, most grow in coco here though. Promix is a different animal and usually when feeding at 6-700 you would feed - feed - flush. Or at 1200 feed - flush - flush. Or 400 feed - feed - feed. If that makes sense.

I am open to trying a feed though, see how it goes for a watering or 2. Coco is super super expensive here, everyone in my area does promix or rockwool, 90% doing promix. Our biggest hydro store has a few bags of coco and pallets on pallets of promix.

Iv also been told to feed promix at 6.5ish to try and get a run off of 6.2. Others say to feed at 6.2 to run off at 6. I dont know. I guess just need to experiment.

Also thought of trying the 1:1 ratio see if that helps the calcium hungry plants.
 

Budley Doright

Active member
Veteran
I use promix..... I had a discussion with another grower recently who was feeding at 1.0 ec or less....once corrected those issues went away.....

Our conversation confirmed the fact that epsoms isnt the answer....to calcium or mag issues....but that underfeeding is the issue.....

I feed on every watering....

1.2 ec is 600 ppm or a bit more.....

Im in michigan and a bale of bx is 26 bucks......
 

Big_Al's_Buds

Active member
I use promix..... I had a discussion with another grower recently who was feeding at 1.0 ec or less....once corrected those issues went away.....

Our conversation confirmed the fact that epsoms isnt the answer....to calcium or mag issues....but that underfeeding is the issue.....

I feed on every watering....

1.2 ec is 600 ppm or a bit more.....

Im in michigan and a bale of bx is 26 bucks......

Thanks for that!

Im up in Canada and its around 30 canadian dollars..

Are you going straight promix? What kind of PH are you feeding at?

Any more info about your set up you want to share that would be great, I feel like I need to relearn more than I thought. A lot of new interesting ideas going around.

With the higher feedings, are you seeing no more def across most strains? You doing the 1:67 by ppm?
 
Last edited:

kelly1376

Member
Now with no RO, tap is around 130ppm coming out and starts at 8.4 PH. I am trying all different combos, strengths, PH, and still getting issues.

I have 18 plants of 5 strains from seed, just took 100 clones this morning in a pheno hunt.

Most plants have some sort of issue,

Yeah it could be your tap water. Too much bicarbonate in your tap water raising PH & stealing calcium availability & the high PH blocking micronutrient absorption. Maybe add some PH down to your water mix I bet that fixes it.
 

Budley Doright

Active member
Veteran
Currently I have no set up....I got busted a while back....the good news is I finish probation in 3 months....and the charges will be expunged....

I use straight promix.... My water is slightly acidic.....and its the only thing I care about.... equal volume jacks and calcium nitrate.....

I mix a 44 gallon barrel at a time....dont use the concentrate....

I dont ph anything....it just seems to work.....if my water was over 7 I would acidify it to somewhere about 6 to 6.5

WHen I go back to growing in november I will likely start with maybe 20 different clones and select them back to 10 or so......then get more.....

Plain water the last week or so.....otherwise all my plants get fertigated from the same barrel....

WHen I get back in the saddle Im going to pick up the thread .....

Big clones and air layers......
 

Big_Al's_Buds

Active member
Yeah it could be your tap water. Too much bicarbonate in your tap water raising PH & stealing calcium availability & the high PH blocking micronutrient absorption. Maybe add some PH down to your water mix I bet that fixes it.

yea I have been going in around 6.2 but coming out 5.4 - 6 depending on I cant figure out what.
 

Big_Al's_Buds

Active member
Currently I have no set up....I got busted a while back....the good news is I finish probation in 3 months....and the charges will be expunged....

I use straight promix.... My water is slightly acidic.....and its the only thing I care about.... equal volume jacks and calcium nitrate.....

I mix a 44 gallon barrel at a time....dont use the concentrate....

I dont ph anything....it just seems to work.....if my water was over 7 I would acidify it to somewhere about 6 to 6.5

WHen I go back to growing in november I will likely start with maybe 20 different clones and select them back to 10 or so......then get more.....

Plain water the last week or so.....otherwise all my plants get fertigated from the same barrel....

WHen I get back in the saddle Im going to pick up the thread .....

Big clones and air layers......



Well that sucks man! 3 Months is pretty good timing though for the start of cold air intake season!

Ill keep an eye on your thread for sure. I should start one I just feel like it would be so time consuming. Im grateful for everyone that takes the time to do it!
 

Budley Doright

Active member
Veteran
yea I have been going in around 6.2 but coming out 5.4 - 6 depending on I cant figure out what.

My only concern is that my water is slightly acidic to start...... I have no clue what the ph is after fertilzers......

Its been working so long.....I dont really care....
 

Budley Doright

Active member
Veteran
Well that sucks man! 3 Months is pretty good timing though for the start of cold air intake season!

Ill keep an eye on your thread for sure. I should start one I just feel like it would be so time consuming. Im grateful for everyone that takes the time to do it!

Its a little better than that..... when Im done with probation I will pick up fully vegged plants.....

Im going to be doing some interesting things with layering....

air layering..... ground layering(stealth layering) and mound layering.....also stealth layering......

plus some other crazy stuff...... not having a grow for a few months has given me the chance to think of doing some crazy stuff...some of which will be entirely unique I believe....

Bad thing about that.....is generally those things dont end well...... lol
 

Trich_Tyson

Active member
Well that sucks man! 3 Months is pretty good timing though for the start of cold air intake season!

Ill keep an eye on your thread for sure. I should start one I just feel like it would be so time consuming. Im grateful for everyone that takes the time to do it!

Hey man. Sorry I never got back in here.
I'm no pro. So take it all with a grain of salt.

I feed everytime with promix... unless I'm out of solution and time.. then I'll hit gen with a little water till he next time I get in there

Rykus has good info in his thread about "flushing" and not giving plain water... I.e flush with 200 ppm. By going back and forth btw water and food you are doing a feast and famine wherein ph will be all over and plants get stressed

I do promix hp with cut in half with chunky perlite.

Chimera has a good promix thread. The overall consensus is that 6.8 is ideal. Worked fine for me.


I am in tap @ bout 220ppm 7.3. Ur high ph is curious for lower ppm

My mix always swings up. So in my last run of promix I went with 6.5 and let it swing.
Honestly don't worry about runoff. It won't be that accurate.

I have fed at 1.0 during flower. The plants slowly yellowed the whole time. But the yield was awesome as well as quality.

Lastly. I'll say that in veg he 1:.666 doesn't cut it for me.
I've done 1:1 with better success
And I've also been recommended 3.7g hydro:2.45g calnit.. the numbers look good there too.

I mix the proportions of hydro and cal not that I like.... then add water till it gets to my desired strength. If I'm gunna add epsom or silica I do it then. Then pH.

Ok.. idk if any of that helps. But it's what I've done
 

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