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the issue with Lucas formula

Discussion in 'Hydroponics / Aeroponics' started by DrGhard, Sep 4, 2017.

  1.  
    DrGhard

    DrGhard Active Member

    While I find the Lucas formula good for sativa-dominant plants (ie fast growers and heavy feeders), when using it with light feeders plants (either whole breeds or particular individuals of a breed) it walways ends up in nitrogen deficiency. This becomes particularly evident when using high intensity lights with UV component such as COB LEDs

    I believe this happens because the 5ml micro/10ml bloom (per gal) formula supposedly to be used in veg is too strong for certain strains at the earlier stages of growth. however the N in diluted formulations (1/4 and 1/2 strenght) is not enough to sustain balanced growth.

    so my suggestion for early veg stages of light feeder plants is to switch to the 3 part formula. all the times, adding back "grow" fixed all the issues for me
     
    Airwalker16 likes this.
  2.  
    JDMase

    JDMase Well-Known Member

    I use floranova bloom and followed the lucas formula, I also bought the veg for when N looked deficient and that also remedied the loss of N found in veg for me with some strains. Usually only fed with it for a few feeds and then switched back when the plant looked healthy again.
     
    DrGhard likes this.
  3.  
    rkymtnman

    rkymtnman Well-Known Member

    incorrect. 5/10 is for low light situations. fluoros etc.

    8/16 is Lucas
     
    DrGhard likes this.
  4.  
    DrGhard

    DrGhard Active Member

    yes, but also is suggested to use this formulation in veg. still the issue remains: for light feeders will cause nutrient stress, and at the same time fail to provide enough nitrogen.
     
  5.  
    SwitchHitter

    SwitchHitter Active Member

    The problem with this solution is simplicity. Simple in = Simple out

    It's the difference of quality that matters. Not the 5% of your profits in cost. Such a strange thing, to not use a nutrient that a company developed for specific purposes. Like people not using additives because they never know how to adjust base to accomodate. base nutrient grows make for weak smokes
     
    DrGhard likes this.
  6.  
    rkymtnman

    rkymtnman Well-Known Member

    by whom? Lucas is 8/16 for veg and bloom
     
  7.  
    rkymtnman

    rkymtnman Well-Known Member

    you can also use maxibloom, floranova bloom and floraduo all in the Lucas formula.

    i'm using maxibloom as we speak. no nute stress and no deficiencies.
     
  8.  
    DrGhard

    DrGhard Active Member

    yes but that would defeat the purpose of Lucas formula isn't it? :D

    one could just use the normal GH 3 parts and have the same (no nute stress and no nute deficiencies) hehe

    PS: also the FloraNova contain organics iirc. not a very good choice for DWC when you have temp issues like i do :D
     
  9.  
    rkymtnman

    rkymtnman Well-Known Member

    how so? lucas is just a n p k ca mg ratio for cannabis. you can even use other brands to get the same ratios.

    i'm using the maxibloom this run for that reason: i'm trying some GH waterfarms and didn't want to use floranova cause of the organic aspect. some HTH pool shock too to prevent root rot.

    and if you look at the GH feed chart for the 3 part, late bloom is lucas. 7.5 micro, 15 bloom if i remember, no grow.
     
  10.  
    be4meliz

    be4meliz Well-Known Member

    I use Gh 3 [email protected] 3/4 strength until 1/2 way into veg.(plants 1 1/2-2 ft,) then switch to Lucas after res. change thru flower and adjust based on EC/PPm -some feed more than others, so 5/10,6/12,8/16. Have never had burn or defencicies in 2 years.
     
    rkymtnman likes this.
  11.  
    Airwalker16

    Airwalker16 Well-Known Member

    Recirculating-Nutrient-Schedule-custom-sm.jpg this has treated me so well in rdwc. I follow it to a tee.
     
    DrGhard likes this.
  12.  
    DrGhard

    DrGhard Active Member

    yes, same here. just gave a try to the lucas for a couple of growths because i ended up without floraGro hehe

    in the end as @rkymtnman says is all about finding the optimal NPK ratio, and i feel that Lucas alone does not cut it, even as "entry level" formulation that supposedly is easier to use.

    i find it easier to just adjust npk and ppm on the go than dealing with the issues of lucas. in the end you just need basic math capabilities
     
    rkymtnman likes this.
  13.  
    rkymtnman

    rkymtnman Well-Known Member

    what i like about it is that i grow different strains each grow. it gets me close enough where all of them are healthy. but if i had a certain strain that i grew all the time, i would definitely want to dial in my nutes for that particualar strain.
     
    Jypsy Dog likes this.

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