I found it.
I'm a little unclear about something. Does the formula/ppm vary at all through the grow? I just see the 1251 ppm shown.
Recommended Profile Target
Where the 100N-100P-200K-60Mg target profile relates to General Hydroponics Flora Series 3 part liquid fertilizer products, the same profile can be mixed without using any of the GH Grow component. If one carefully reads the labels, he'll find the Micro component actually contains more N than the Grow, and the Grow component contains nothing else that isn't already contained in the Micro and Bloom components. Substituting a little more of the Micro component to make up for the missing Grow precludes the use of the Grow component altogether.
Deviations from a given target are to be expected when using any premixed fertilizer, even 3 part products, due to the pre-determined ratio between elements contained in each part. More often than not, increasing the content of one element to match its target
perfectly causes other elements to move off-target. Given cannabis' apparent immunity to a wide range of profiles, small compromises from the target are of no consequence, but often annoying. The profile arrived at during the project used just the Micro and Bloom GH Flora components at a convenient 1:2 usage rate, though any comparable fertilizer product(s) could be used to reproduce the profile. It translates into the following formula...
N-P-K-Mg ppm ml/US Gallon GH Flora Est
[email protected] Est Cost/ResGal
122-99-171-68 7.5M-15B-0G 1251 $0.15
This formula has proven itself to be one that can be used for all stages of growth, under HID lighting of various intensities, and when using a variety of hydroponic systems with a reasonably good quality source water. What is most notable, however, is in the interest of efficiency, low maintenance, ease of use, fewer products to purchase, equally high yields and equally healthy plants. For expedience, that GH formula was rounded to 8M-16B-0G, which has become widely known in Internet cannabis circles as the Lucas formula.