This is incorrect. The Jacks bag I have says to add the 5-12-26 first then any magnesium sulphate. Then finally to add the calcium nitrate. This is so that the sulphates have been dispersed and so that the calcium does not precipitate out as calcium sulphate by attaching to the sulphur.
Jacks 5-12-26
- Thread starter Jabapc
- Start date
This is incorrect. The Jacks bag I have says to add the 5-12-26 first then any magnesium sulphate. Then finally to add the calcium nitrate. This is so that the sulphates have been dispersed and so that the calcium does not precipitate out as calcium sulphate by attaching to the sulphur.
i never get any leftovers in the bottom of my res. well i do for about 10 min and then it dissolves completely. i love it, its cheap and it works great.
I believe what you see on the bottom is Monopotassium phosphate. This is undisolved fertilizer.
What is mentioned above is calcium sulphate, or gypsum which has a very low solubility rate. The gypsum is formed when the calcium combines with sulphur. Sulphur is use with many of the trace minerals so that the trace mineral disolve easily in solution. The chelating agents keeps the trace minerals from combining and precipitating out of solution. It is kind of like a hand wrapping around the mineral and covering all the points that can attach to another atom. Chealating agents are more expensive than sulphates so that is why we get two part solutions. Plus you get the sulphur that you need in your fertilizer by using a sulphate and not a chelating agent.
Last edited:
This is true unless it has not had enough time to fully disolve then you may have some on the bottom till it can fully disolve. Many things can affect the speed at which nutrients disolve. The two biggest are temperature and PH. Raise the temperature and it will disolve more readily. Lower it and it will take more time for it o disolve. PH is more tricky as some things need higher PH and some need lower. Not sure which one MKP is.
I generally make a concentrate out of my Jacks and Calcium nitrate in advance of using it. Then I pour it into my mix bucket in small doses of concentrate and I have nothing undisolved. Speeds things up for me as my water is almost always cold when I mix.
I looked up MKP's solubility at different tempuratures and here is a example of the role remp plays on solubility of MKP.
At 77 degrees you can disolve 834 gramms per gallon.
At 86 degrees you can disolve 1062 grams per gallon.
This is a difference of 227 grams or around a half pound per gallon. That is a big difference and clearly shows the effect that tempurature has on the solubility of your fertilizers.
If you are having some undisolved fertilizer in you jacks you can raise the tempurature to speed it up.
At 77 degrees you can disolve 834 gramms per gallon.
At 86 degrees you can disolve 1062 grams per gallon.
This is a difference of 227 grams or around a half pound per gallon. That is a big difference and clearly shows the effect that tempurature has on the solubility of your fertilizers.
If you are having some undisolved fertilizer in you jacks you can raise the tempurature to speed it up.
Using 1:100 stock solutions will solve the solubility issues and give you more accurate results. Always use pure water for stock solutions, using tapwater will contaminate them.
If you put 834g of mkp in a gallon of pure water, you`d have almost 50,000ppm of P and over 62,000ppm of K
Solubility isnt an issue with room temperature water and normal nute strengths.
If you put 834g of mkp in a gallon of pure water, you`d have almost 50,000ppm of P and over 62,000ppm of K
Solubility isnt an issue with room temperature water and normal nute strengths.Dr.RedWhite
Active member
Anybody have the film that covers the solution in the res using Jacks? I run a small aerator to keep it from forming.
I get a film with any nutrient if it's not being constantly mixed/aerated.
Dr.RedWhite
Active member
The film may even be beneficial, helping to keep the solution from evaporating.
My guess is it's an anaerobic bacteria forming a mass, so probably not beneficial. Besides, your res should be covered to block light so algae doesn't grow, as well as prevent unnecessary evaporation.
whereyeaat
New member
So basically I have been wondering about whether to use a dif nute in promix as opposed to a straight water hydro like flood and drain. I emailed JR Peters and asked there recomendation, this is the response I got:
Thanks your interest in our products. I am going to answer your questions, but my disclaimer is we don’t formulate or trial our fertilizers for or on medical marijuana. I have included two different fert recommendations. The first is for you Promix bags. The second is for a true hydro setup. I would recommend the 17-4-17 as your grower, it is designed for growing in RO or very pure water. You may need to have some Cal-trate or Cal Nitrate on hand, also as your crop tends to be pretty calcium hungry. If you tell me a little more about how you water/ feed I can give you exact amounts. Please email me or give me a call.
Veg: 200 ppm of Nitrogen 17-4-17
Blooming (First week): 300ppm of Nitrogen of 10-30-20 + extra Epsom ( 4oz/ 100 gallons)
(2nd week) back to vegetative
Alternate between 2 formulations till the end of the growing cycle.
Hydroponic
Veg: 150 ppm of Nitrogen 5-12-26 +Cal Nitrate.
Bloom: Blooming (First week): 300ppm of Nitrogen of 10-30-20 + extra Epsom ( 4oz/ 100 gallons)
(2nd week) back to 150 ppm of vegetative formula
Alternate between 2 formulations till the end of the growing cycle.
After and another email and phone call I am still unsure. With the 17-4-17 the tech on the phone told me I would have an NPK of 150-15.45-124.5 and cal-mag of 26.4-13.2. Seems a little off to me but she assured me it would work very well especially with RO as that particular blend is meant for RO. I asked why she recommends 300 ppm of N for flower and she said that was just so the PK would be High as well, and to use it every 3rd feeding and my true N value in the media and plants would even out.
Iv never been too fussy with ferts, I was on the Lucas forever in ebb and flow and rock wool but for various reason will be switching to 5gal smarties of promix. Jacks is just so cheap and comes highly recommended.
Does anyone have any person experience or can someone with more knowledge on the subject then me perhaps enlighten me a little bit?
here are the links to the various ferts; (maybe someone can work out the NKPCaMg and so on of them for me as I have no idea how haha)
17-4-17 http://www.jrpeters.com/Products/Jac...-Water-LX.html
5-26-26 http://www.jrpeters.com/Products/Jac...ydroponic.html
10-30-20 (bloom booster) http://www.jrpeters.com/Products/Jac...m-Booster.html
Im curious to hear peoples thoughts on if the 17-417 has enough P,Ca,Mg and other micros. Its supposed to be an all in one and 1 bag is cheaper then 2 obviously!
Thanks your interest in our products. I am going to answer your questions, but my disclaimer is we don’t formulate or trial our fertilizers for or on medical marijuana. I have included two different fert recommendations. The first is for you Promix bags. The second is for a true hydro setup. I would recommend the 17-4-17 as your grower, it is designed for growing in RO or very pure water. You may need to have some Cal-trate or Cal Nitrate on hand, also as your crop tends to be pretty calcium hungry. If you tell me a little more about how you water/ feed I can give you exact amounts. Please email me or give me a call.
Veg: 200 ppm of Nitrogen 17-4-17
Blooming (First week): 300ppm of Nitrogen of 10-30-20 + extra Epsom ( 4oz/ 100 gallons)
(2nd week) back to vegetative
Alternate between 2 formulations till the end of the growing cycle.
Hydroponic
Veg: 150 ppm of Nitrogen 5-12-26 +Cal Nitrate.
Bloom: Blooming (First week): 300ppm of Nitrogen of 10-30-20 + extra Epsom ( 4oz/ 100 gallons)
(2nd week) back to 150 ppm of vegetative formula
Alternate between 2 formulations till the end of the growing cycle.
After and another email and phone call I am still unsure. With the 17-4-17 the tech on the phone told me I would have an NPK of 150-15.45-124.5 and cal-mag of 26.4-13.2. Seems a little off to me but she assured me it would work very well especially with RO as that particular blend is meant for RO. I asked why she recommends 300 ppm of N for flower and she said that was just so the PK would be High as well, and to use it every 3rd feeding and my true N value in the media and plants would even out.
Iv never been too fussy with ferts, I was on the Lucas forever in ebb and flow and rock wool but for various reason will be switching to 5gal smarties of promix. Jacks is just so cheap and comes highly recommended.
Does anyone have any person experience or can someone with more knowledge on the subject then me perhaps enlighten me a little bit?
here are the links to the various ferts; (maybe someone can work out the NKPCaMg and so on of them for me as I have no idea how haha)
17-4-17 http://www.jrpeters.com/Products/Jac...-Water-LX.html
5-26-26 http://www.jrpeters.com/Products/Jac...ydroponic.html
10-30-20 (bloom booster) http://www.jrpeters.com/Products/Jac...m-Booster.html
Im curious to hear peoples thoughts on if the 17-417 has enough P,Ca,Mg and other micros. Its supposed to be an all in one and 1 bag is cheaper then 2 obviously!
Dr.RedWhite
Active member
After some experimentation I agree with this statement.
Caravaggio
Member
This is what you guys need. Its perfect for Cannabis. The only thing its even remotely missing a bit of is Iron. Which is easy to supplement.
A true 1 part
http://www.jrpeters.com/Products/Jack-s-Professional/Jack-s-LX/15-5-15-Ca--Mg-LX.html
A true 1 part
http://www.jrpeters.com/Products/Jack-s-Professional/Jack-s-LX/15-5-15-Ca--Mg-LX.html
J
jagerjamie12
very good grow cannot wait to see how my first grow turns out. So can you use this for hydro rockwool grow (Please excuse if i come of dumb still learning).
cannot wait to see how my first grow turns out. So can you use this for hydro rockwool grow (Please excuse if i come of dumb still learning).whereyeaat
New member
Caravaggio
Member
You can always add a bit more CalMag if you want but 4% is a pretty good start
Caravaggio
Member
bump in the night
forgetmeplease
Member
its funny how this is a standard hydroponic mix for greenhouse crops. It works on everything. No need for pk boosters or 5 different bottles of snake oil. Hands down the best fertilizer for the price. 5-11-26 plus cal -nit equal parts for grow and more 5-11-26 for flower. If anything you would benefit from cal-mag and iron supplement with this mix.
