GH Flora Trio - UC Feed Chart

Hey all, I'm in week two of veg with my 60-gallon UC system. I was wondering if the feed chart below's accurate. If not, does anyone have an adjusted chart I can check out?

try out Lucas formula: 1:2 ratio of micro/bloom. no need for grow. use it from start to finish.

here's the "why" and "how" behind it:

http://www.angelfire.com/cantina/fourtwenty/articles/profiles.htm

rkymtnman said:

try out Lucas formula: 1:2 ratio of micro/bloom. no need for grow. use it from start to finish.

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I didn't see the formula that only required micro and bloom, only the formula using all three.

I think I get what they're saying. Going by the chart, it looks like the ppm stays the same through each cycle (pre-veg, veg, and flower) instead of adjusting it every week. Is that right? And then, there are only 3 flushes. The first, when the grow starts, after veg, and after flower. Is that right as well?

JSB99 said:

I didn't see the formula that only required micro and bloom, only the formula using all three.

I think I get what they're saying. Going by the chart, it looks like the ppm stays the same through each cycle (pre-veg, veg, and flower) instead of adjusting it every week. Is that right? And then, there are only 3 flushes. The first, when the grow starts, after veg, and after flower. Is that right as well?

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Lucas formula is 8mL micro/16 mL bloom but you can use it at any 1:2 ratio to get to your target EC. i used it at 4:8 most of the time and EC was about 1.0

i only flush if i see a problem.

i kinda go by a rather crude EC chart: 0.2 for seedlings, 0.4 to 0.6 for early veg, 1.0 to 1.2 for rest of veg an most of flower, 0.4 for end of flower.

you'll need your EC meter to tell you what your plants need, more or less nutes. if EC goes up, too strong EC down, too weak, EC constant perfect.

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.

rkymtnman said:

Lucas formula is 8mL micro/16 mL bloom but you can use it at any 1:2 ratio to get to your target EC. i used it at 4:8 most of the time and EC was about 1.0

i only flush if i see a problem.

i kinda go by a rather crude EC chart: 0.2 for seedlings, 0.4 to 0.6 for early veg, 1.0 to 1.2 for rest of veg an most of flower, 0.4 for end of flower.

you'll need your EC meter to tell you what your plants need, more or less nutes. if EC goes up, too strong EC down, too weak, EC constant perfect.

Click to expand...

Gotcha!

I do have a ppm meter, BTW

1:2 formula, that makes things pretty easy!

if you can, use RO/distilled water with the Lucas. your pH will come out at pretty close to 5.8

the hardest thing about dwc is not to overfeed. since the roots are always in the nutes, they don't need as strong as in other methods

JSB99 said:

1:2 formula, that makes things pretty easy!

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keep it simple as you get accustomed to your new setup. the lucas works great and will allow you to focus on other issues that will surely pop up.

rkymtnman said:

keep it simple as you get accustomed to your new setup. the lucas works great and will allow you to focus on other issues that will surely pop up.

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Do you change the reservoir using the "100% add-back method"?

I'm reading some various posts about this just to fully understand it. Sometimes it's the real simple things that'll trip me up

Just so I'm not missing anything, this is what I'm understanding:

1. First fill I'll be mixing 8m/16b per gallon (60 gallons)
2. Each day I top off the water (I don't have RO, but my water is really good)
3. Balance pH
4. When I've replaced the amount of water in my system (which shouldn't happen), or I'm changing cycles (3 of them), I flush and feed 8m/18b per gallon

Is that it? I'm not going to have to continually feed each week?

I'll probably drop my water down to 40 gallons

JSB99 said:

Do you change the reservoir using the "100% add-back method"?

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no. i preferred fresh nutes weekly.

first res i would go with 3M/6B to start with. it's easy to add more nutes if you need it stronger.

i wouldn't top off daily. if you can, run the res for a week if possible. then dump and change. as long as the water level doesn't drop below the roots. if you need to keep water level steady, top off with plain water

set pH to 5.5 and it should climb up. reset at 6.1 to 5.5

rkymtnman said:

no. i preferred fresh nutes weekly.

first res i would go with 3M/6B to start with. it's easy to add more nutes if you need it stronger.

i wouldn't top off daily. if you can, run the res for a week if possible. then dump and change. as long as the water level doesn't drop below the roots. if you need to keep water level steady, top off with plain water

set pH to 5.5 and it should climb up. reset at 6.1 to 5.5

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Got it. Thanks Man!

Used this for years with perfect results.

Airwalker16 said:

Used this for years with perfect results.View attachment 3995580

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That's identical to the one I was looking at, in regards to the chart. I really didn't see a problem with it. I had to build a spreadsheet to transform the ml/gal to tablespoons and cups for my 60-gallon system. I don't see much of a difference in effort between the two. And, even though you're cutting out the "Grow", you have to use more of the others.

But, after calculating everything with the Lucas formula, I can see a little bit less of a hassle.

I plan on dropping my total gallons down to 50 during veg, and 40 for flower. I have gaps in my schedule because I think I can go two weeks without a flush, with the amount of water I have. I could be wrong, and I'll adjust if necessary. Just trying not to waste money.

I've always used gro. I know many have success without using it but I can't imagine leaving it out. And I'm sorry if this was identical to what you posted. I just saw your thread title and wanted to be helpful because I had that picture saved so my bad I guess. Just trying to be useful to you.

Whats the reason behind dropping the total gallons in the system?

Would it not be better to have as much of the roots as possible submerged and taking up nutrients

Don't use the "Lucas formula", Lucas was just a fucking random stoner and his "formula" is based on nothing scientific. Using nothing but bloom formula for all stages is just fucking stupid. In fact, you'd be far better off to use the Grow formula for all stages, since it's actually a standard hydro fert. Bloom is for people who like to poison their plants with excess phosphorus. I never use the shit, cuz got tired of nute burn. Grow formula 24/7.

BobCajun said:

Don't use the "Lucas formula", Lucas was just a fucking random stoner and his "formula" is based on nothing scientific. Using nothing but bloom formula for all stages is just fucking stupid. In fact, you'd be far better off to use the Grow formula for all stages, since it's actually a standard hydro fert. Bloom is for people who like to poison their plants with excess phosphorus. I never use the shit, cuz got tired of nute burn. Grow formula 24/7.

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I use bloom like the chart I posted says to. all 15 strains I've ran have responded perfectly to it.

BobCajun said:

Lucas was just a fucking random stoner and his "formula" is based on nothing scientific.

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just a random guy who decided to find the optimal NPK for cannabis and spent 10 years on it doing over 25 grows.

meanwhile, bobcajun is just a random internet wanna be scientist who thinks a 9/12 light cycle is the best and uses a hydro formula from the 1930's which was developed for one week of a tomato's life cycle. LOL.

look at the late bloom amounts from GH feed chart and airwalkers custom chart. 1:2 ratio of micro/bloom. just further proof that Lucas works great!