phantom grower
Member
Hey Wastei, thanks for the post! is there any way you can link me to that excel sheet you mentioned?It keeps the Ca:Mg ratio very close to 2:1. As I understand the base formula was added as a result of introduction of LED's. I do 4:2 in flower of A to B and skip Epsom salt all together. 5-12-26 has been around since 2002 and before that it was marketed as a Jacks Classic "veggie formula"
3-2-1 is a very affordable and stable veg formula that you can use throughout flower if you choose to. Mg is slightly too high but that's kinda of a positive depending on growing method.
I've used 3-2-1 from start to finish many cycles in everything from Aero to Coir but I like to lower nitrogen more on some long flowering sativa's that's why I wanted to figure out what's in the different formulas.
I use an old Excel spreadsheet I got here years ago that you can add whatever input to. I find it easier and more straight forward to use than Hydrobuddy. I mostly use my phone and you need a PC for HydroBuddy.
10-30-20 is a pretty bad NPK for flowering Cannabis, way to much P for me to be comfortable. If you choose to use it you have to figure that one out yourself! It's more for real blossoms and flowers that needs high P to flourish. Cannabis has low to moderate P requirements. Excess MKP will only crash pH in containers.
Here's a copy of Jacks Clone 15-6-17:
Calcium Nitrate - 8kg
Magnesium Nitrate - 5.5kg
MKP - 6kg
Potassium Nitrate - 3.65kg
Rexolin APN - 150g
Total - 23.3kg
Cheers!