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Old 01-16-2007, 10:04 AM #1
Octavian
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Approximate Lucas w/GH Dry Nutes

So I've been using the Lucas formula in slightly varying iterations for several years now. I've used it exactly as directed with great results. I've also used GH FloraNova Bloom with great success. I've tweaked it with several additives, but have ended up abandoning most of them.

This may be helpful for people who find themselves in the situation that I found myself in recently, having run out of FloraNova Bloom. I checked my stocks, and found the old powdered GH nutes, and rather than let them go to waste, I did the calculations to use them and still maintain the optimum nutrient ranges.

For anyone who doesn't know what the Lucas Formula is, it is 8mL/gal GH FloraMicro plus 16mL/gal FloraBloom. It gives the target ranges of the different macronutrients plus magnesium using pH's target ranges for nutrient levels. pH Stated that the target ranges for cannabis in parts per million (ppm) are Nitrogen 100, Phosphorous 100, Potassium 200, and Magnesium 60.

I did the calculations and the powdered GH nutrient MaxiGro at 1tsp/gal works out to 106ppm N 23ppm P 123ppm K 21ppm Mg. This leaves us spot on with the Nitrogen, but a little low in everything else.

I have some powdered GH KoolBloom which at 1/4tsp/gal works out to 8ppm N 78ppm P 92ppm K 4ppm Mg. This completes the Phosphorous and Potassium needs, but still leaves us a little low in Mg.

1/4tsp/gal Epsom Salts will add 39ppm Mg...perfect.

The final solution will have the following concentrations of nutrients. Nitrogen 114ppm Phosphorous 101ppm Potassium 215ppm Magnesium 64ppm.

Cheers


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Old 08-25-2008, 03:08 PM #2
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This is a great find, I have found myself in a position where I have a bucket of gro and bloom wasting away. I wish we had a listing with all of the calculations for common nutes, at a tsp dosage. The results could easily be adjusted to find a ratio that fits your needs.
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Old 10-25-2008, 10:02 PM #3
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1) What is Lucas? Flowering, or veg, or both? If both, which are you trying to replicate? (I think I get that you're saying 1 teaspoon Grow, 1/4 teaspoon Bloom, and 1/4 teaspoon Epsom Salts, per gallon, but I don't get if this is for veg or flower).

2) I have MaxiGro and MaxiBloom. Anyone know the NPK PPMs for MaxiBloom?

3) Anyone want to translate the NPK PPMs above into the code used on fertilizer (15-5-14, etc)?

4) It's been a while since my last grow. Veg I ran them up to 1400 PPMs of MaxiGro (my water's about 150 PPM out of the tap). If memory serves, my last flower had a good bit lower MaxiBloom PPMs, but it's been a long time. Anyone want to suggest a figure for max PPMs during flower? (I'm going to do maybe 1/4 strength first week, then 1/2, then 3/4, and hit full strength on the fourth week, or maybe 1/3, 2/3, and hit full strength on week 3)
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Old 10-25-2008, 10:09 PM #4
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NPK to PPM calculator here:

firstrays.com/fertcalc.htm

Last edited by _Dude; 10-25-2008 at 10:10 PM..
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Old 07-07-2009, 11:27 AM #5
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Holy shit good info!

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Old 07-07-2009, 10:16 PM #6
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MaxiBloom is Lucas formula all by itself without adding anything.

7 grams/gal:
N 92
P 121
K 215
Mg 65
S 74
Ca 92

https://www.icmag.com/ic/showthread....axibloom+lucas
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Old 10-16-2009, 03:43 PM #7
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Wow from the calculator Supernatural Brand Aqua Grow and Bloom are both deficient in Potassium I believe, its the third one in the list, I'm very tired so I won't go back and look.

But that's odd, they have such a good rep.

So you're telling me I need to be targeting those numbers? Can you link me to the source that originally claimed those were ideal, and where hopefully he/she explained their reasoning?

Thanks.
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Old 10-16-2009, 09:52 PM #8
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Hi Guys,
This has been discussed somewhat in the dry nute thread. I started using Maxi-bloom two years ago and knew nothing about this EXCEPT that my plants grew great. Thanks for the input.
Cheers,
ET
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Old 12-05-2009, 10:45 PM #9
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Don't know why I never followed up on this post, but Lucas is super-easy to reproduce with dry nutes. I forget ATM who makes it (AH or GH) but it's called Maxi-Grow and Maxi-Bloom or something like that. You mix 2 parts Grow and 1 part Bloom and you're done. I use 1300 PPM for veg and flower and it works great (don't worry about getting it right on the dot, you're looking for a range, not a point. So anywhere from 1200-1400 PPM is good. BUT, my water comes out of the tap at about 250 PPM so keep that in mind).
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Old 12-05-2009, 11:03 PM #10
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Quote:
Originally Posted by _Dude View Post
Don't know why I never followed up on this post, but Lucas is super-easy to reproduce with dry nutes. I forget ATM who makes it (AH or GH) but it's called Maxi-Grow and Maxi-Bloom or something like that. You mix 2 parts Grow and 1 part Bloom and you're done. I use 1300 PPM for veg and flower and it works great (don't worry about getting it right on the dot, you're looking for a range, not a point. So anywhere from 1200-1400 PPM is good. BUT, my water comes out of the tap at about 250 PPM so keep that in mind).
Dude,
You have to be wrong. The Maxi-Grow is very heavy in N and Lucas formula is fairly light in N relying solely on the micro.

I've heard that the GH Maxi-bloom used straight is a very close approximation to the Lucas Formula.

Where did you get your info? Mine comes from the Dry nute thread and from this thread right here (about 4 posts up)
ET
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