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

[Rabbi]

Have you ruled out everything else? Many people use jacks without this issue so I'm inclined to believe the problem is somewhere else in your setup.

Have you...
recently checked how well your ph tester is calibrated?
Ruled out fungus gnats or another soil-born pest?
Ruled out Root Rot?

It's not the ph, not bugs and not root rot...pretty sure it's not my set up but never know I guess.

 

[Rabbi]

Try Epsom at 1 gram for every 3 grams jacks. I use 3-1.8-1 ratio of j. Cal. Epsom respectively. Water down to 72% for 1.2 ec or shoot for 0.5-1 gram depending on solution strength. Foliar of epsom could clear that up on new growth. Overwatering and or low temps can also cause calcium lockout which can and does cause these rust spots. Roots that are compromised show calmag issues first a lot of times even in a well balanced feed. The answer in that case is not more cal mag lol. You'll just fuck your ratios all up chasing the problem down that rabbit hole. The correction should be subtle if it's s nutrient issue because jacks works Ina wide range of varieties. If you find yourself drastically altering the recipe,it's likely not the recipe.

Ok maybe I'll try the epsom salt. My temps are good. I haven't adjusted anything food/recipe wise, 1:67.

 

[growteam]

Post pics.

xxxstr8edgexxx is right on.

 

[woolybear]

i run jacks check out my foliage mang

 

[Rabbi]

i run jacks check out my foliage mang

View Image

Nice. Wonder what the deal is with mine. Oh well I'll try the epsom salt and see where I'm at from there.

Do you add anything else other than the 15-12-26 and cal/nit?

 

[Rabbi]

Post pics.

xxxstr8edgexxx is right on.

 

[Rabbi]

 

[xxxstr8edgexxx]

up your over all feed a hair.
maybe 0.1-0.2 ec's at most. you shouldnt really need the epsom that bad most get away without it but i also heard of one guy saying he periodically supplements with a foliar of epsom.
i think you are slightly underfeeding. just a guess looking at pics. is it worse under lights?

 

[Rabbi]

I've tried with higher ec(2.0+) and lower ec(1.0-) but still same problems. I don't think it is worse under lights but I'd have to check to be sure, I'll take a peek tonight.

 

[Treetroit City]

do any of you smarty pants know the minimum dilution ratio for the complete line up?
that being the jacks/calnit. i know it would be alot. how many total grams in of the mixed salts in a stock solution of the maximum strength without causing fallout issues. and what ph. range would i be looking at holding that in solution. probably a question for the extension service.

the maximum solubility of the Peters Pro 5-11-26 is listed as 3 pounds per gallon of water. I would presume the Jacks 5-12-25 to be very similar.

Yaraliva calcium nitrate has a max solubility listed as 1200 grams per liter of water, or right at 10 pounds per gallon.

.

Yep Jack's hydro lists 3 pounds per gallon, however, Jr Peters CalNit lists 7 pounds so I guess it's different for different brands of CalNit.

 

[xxxstr8edgexxx]

Yep Jack's hydro lists 3 pounds per gallon, however, Jr Peters CalNit lists 7 pounds so I guess it's different for different brands of CalNit.

Yep Jack's hydro lists 3 pounds per gallon, however, Jr Peters CalNit lists 7 pounds so I guess it's different for different brands of CalNit.

my question was about the cal nit and jacks together. at what concentration does the calnit cause the magsul in jacks to bind and fall out as gypsum. basically how concentrated can you make the full mix before the jacks and calnit react.

it is done by one member with his nutrient line up with a doser. he mixes his formula to a really strong mix and doses it to his water line and it fills his rez on a float. i was curious how concentrated i could make it to serve as a one part stock solution to be fed through a single doser.

 

[ganjourno]

Just test it proportionally. Measure 3 grams jacks and 1.8 calcinit. Add each to 50ml of water, fully dissolve, then mix them together. If they form a precipitate, do it again with 100ml of water. Then again with 150ml, then 200ml, then 250ml, etc, until you find the right ratio. I would love if you could share the results, btw. My bet is on 150ml.

 

[Treetroit City]

my question was about the cal nit and jacks together. at what concentration does the calnit cause the magsul in jacks to bind and fall out as gypsum. basically how concentrated can you make the full mix before the jacks and calnit react.

it is done by one member with his nutrient line up with a doser. he mixes his formula to a really strong mix and doses it to his water line and it fills his rez on a float. i was curious how concentrated i could make it to serve as a one part stock solution to be fed through a single doser.

Ah, gotcha. Yeah I've been looking at the dosatrons as well and for sure one bucket of concentrate would be nice. DJM has a bad ass setup for sure.

 

[Rabbi]

is it worse under lights?

So I took a peek tonight and no it's not worse under the lights.

 

[xxxstr8edgexxx]

hmm me thinks you need epsom foliar. thatll correct it while you wait for adding it to the feed to show results..

 

[ganjourno]

Rabbi does your Jack's fully dissolve? Any residue or cloudiness?

 

[xxxstr8edgexxx]

im a lil shocked that you woulsd need magsul with jacks though. but it can happen. ive heard people mention it/. i would be inclined to think whatganjourno is hinting at may be a possibility. fallout of the mag and cal as gypsum leaving less mag

 

[Rabbi]

Rabbi does your Jack's fully dissolve? Any residue or cloudiness?

yeah it's fully dissolved, no residue or etc. I'll try the epsom and report back.

 

[Rabbi]

hmm me thinks you need epsom foliar. thatll correct it while you wait for adding it to the feed to show results..

Ok I'll add some epsom to my rez asap. Not a big fan of foilars to my plants once in flower but Ill report back in a couple weeks after adding epsom to the rez. Not all the leafs are spottied up but just little concern since some are.

 

[ganjourno]

Are you SURE it's not pH? Have you done a runoff test on your media?