There has been some interest in looking at the Jack’s nutrient line buffering capacity so I ordered up the most recent version of the Jack 321 and RO base formulations from a local supply house.
33-103020 Jacks Nutrients 10-30-20 Bloom FeED
33-12416 Jacks Nutrients 12-4-16 Hydro FeED RO
33-15617 Jacks Nutrients 15-6-17 Clone FeED
33-51226 Jacks Nutrients 5-12-26 Part A FeED
33-55018 Jacks Nutrients 5-50-18 FeED UltraViolet
33-71530 Jacks Nutrients 7-15-30 Finish FeED
Already stocked:
Part B: PLANTEX Calcium Nitrate Purecal 10033
Part C: Dr. Teals Epsom Salt
We’ll be looking at the inherent buffering of the 321 formulation to compare with previous trials. Also, will look at the RO specific version of this once received.
For the part B and C, I’ll be utilizing the stock of Calcium Nitrate and Magnesium Sulfate that I already have on hand. I’m assuming that the B and C are pure, which I believe is the case, and do not have anything else to change the alkalinity. Such as bicarbonates.
For 321, we’ll be using the Part A along with any needed Part B out of my stock (Calcium Nitrate). Part C, if added, will simply be Epsom Salts. Target will be adjusted such that the EC is 1.7 in order to favorably match the salt concentrations of previous trials.
The remaining ingredients are for a trial grow and probably not evaluated here.
Back-linked thread to an example of using the 321 successfully that has spurred this evaluation: