Lucas formula?

Discussion in 'Advanced Growing Techniques' started by Help_Needed, Aug 6, 2007.

  1. I've seen several references to this mystical Lucas Formula, apparently referring to a nute formula for hydro. I've tried searching for it, but all I'm finding is more referrences lol.

    Can anyone provide a link or some more info? Thanks.
  2. I'm so glad to hear that a new grower is going to be using this formula! I wish I had heard about it before and not wasted so much money on Advanced Nutrients when I don't know how to use them right!

    PLUS not having to change the reservoir is music to my ears considering the amount of work changing the reservoir can be with lots of suppliments. The Ph stays stable too... It's just the best formula for hydro I've heard of considering the work and cost involved and the results are amazing.

    It really makes my day seeing this knowledge get out there. :D
  3. what the fuck are you talking about? i got this link from googling it. it was like the 3rd or 4th link on the first page of the results. and if you mean this link is not informative then dont use the lucas formula, because this is the link that describes it. it fuckin spells out the formula for a retarded 3 year old. :rolleyes:
  4. Here it is:

    Lucas Formula

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    Submitted: 15-05-2004

    General Hydroponics Flora Series Feeding Strategy - Lucas Formula

    G-M-B (Grow-Micro-Bloom)
    0-5-10 - For Vegetative cycle (18/6)
    0-8-16 - For Flowering cycle (12/12)

    The numbers above indicate the number of milliliters (ml) of Flora Grow, Micro or Bloom formulas that I use in one gallon (US Liquid) of nutrients.

    You will notice I dont use any of the Flora “Grow” formula, do not need to, the Flora "Micro" provides plenty of Nitrogen.

    There are two ways to work with this formula:

    1. Top off the reservoir daily using a pH corrected water solution as required to maintain full reservoir level. After adding back an amount of water equal to the amount of your reservoir capacity you should change the reservoir and put in fresh solution.

    2. Top off the reservoir daily using a pH corrected 100% strength nutrient solution as required to maintain full reservoir level. Continue to use this nutrient solution without dumping the tank unless the PPM rises above acceptable levels.

    Between vegetative and flowering cycles you should dump your nutrients, then flush (possibly with Clearex) to remove salt buildups, then change to the other feeding program. Always shake your GH nutrient bottles before using them!

    For young plants, just transplanted into the hydro setup, give them 50% strength nutrient mix to prevent overfeeding them while their young. Gradually bring up the mix to full strength as they grow over the next few weeks or so.

    The lucas formula is normally intended for use with RO or near 0 PPM water.

    NOTE: The Lucas formula eliminates the need for Epsom salts to correct (Magnesium) Mg deficiencies in most normal feeding programs recommended by manufacturers. Cannabis needs a lot of Magnesium to thrive.

    The Flora Micro is providing the Nitrogen and the Magnesium in the proper balance, thus there is no need for the Grow formula and little or no room under the maximum acceptable ppm limit of 1600 @ 0.7 conversion.

    Calculated EC/TDS levels:

    EC microsiemen:
    0-4-8: 946 µS
    0-5-10: 1184 µS
    0-8-16: 1894 µS

    TDS @ 0.5 conversion:
    0-4-8 = 473 ppm
    0-5-10 = 592 ppm
    0-8-16 = 947 ppm

    TDS @ 0.7 conversion:
    0-4-8 = 663 ppm
    0-5-10 = 829 ppm
    0-8-16 = 1326 ppm

    Addback Calculator - (For Advanced Users)

    Say you were running the 0-8-16 formula, at 0.7 conversion with a 22 gallon res. When you first fill it up, your ppm will be around 1330.

    Now you have been growing for a week, and some of the water has been taken up by the plants, some has evaporated, and now your res is at 947 ppm. You need to get your ppm from 947 to 1330. Here is the equation:

    ((target - current) / target) * 8 ml per gallon * res gallons = Flora Micro (ml) double this figure to get Flora Bloom (ml)


    ((1330 - 947) / 1330) * 8 * 22
    (383 / 1330) * 8 * 22
    0.3 * 8 * 22 = 53 ml Flora Micro

    53 ml Flora Micro, double that and you get 106 ml Flora Bloom. So 53 ml Flora Micro and 106 ml Flora Bloom to add back to your 22 gallon res to get you from 947 to 1330.

    Using Hard Water GH Micro

    I had been experimenting with using the Hard water Micro as a substitute for the normal Flora Micro, this to account for my hard 350 PPM water and the lack of a large enough RO filter at the time. It has worked well for me. I just kept my reservoir below 1150 PPM @ .5 conversion and its all good.

    One tip - do not pH down this stuff, the hard water micro will drop pH gradually over the next 24 hours, for example I mix up a batch, it is at like 6.2, the next day, its at 5.6-5.8 after running in the system for a while. If I pH downed that to 5.7 before putting it in the system, it ended up as low as 4.8-5.2 by the next day.

    My conclusion, the hard water micro was buffering the alkaline crud in my water, it just doesnot do it ASAP fast like the phosphoric acid
  5. Thanks Rumple. I really appreciate you digging this up for me =). I found another couple of Lucas articles that were pretty fascinating - especially the one about how to design your grow area by working backwards from the amount of bud you want/need. But this is exactly what I was looking for.

    My hydro unit is only in it's first week of growing and I did NOT start it out with this formula. I simply went with the guidelines that GH provided with the unit - and went half strength at that so as not to burn (only 300ppm to start). Think I should drain the res and start over? Or should I just add in nutes per this formula and let the ratios balance out over time as I bring the ppm up to full strength?
  6. no offense on rumple, but that's the exact text on the link i gave you and you said it wasn't. art you retarded
  7. Sorry man. This is a good example of why e-mail and message boards can be really crappy ways to communicate.

    What I meant to say was that I did try to Google this question and MY attempts to use Google to find the information were not successful. I don't know if maybe I misspelled something or maybe I just didn't know enough about what I was looking for to spot the correct entry.

    I appreciate you posting the info so quickly for me, and I apologize if it seem that I said your link wasn't what I was looking for.

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