NPK question

Discussion in 'First Time Marijuana Growers' started by Cetyal, Jan 17, 2014.

  1. #1 Cetyal, Jan 17, 2014
    I was unable to find a NPK fertilizer with 15-15-15 from any gardening stores around my area.
    The clostest NPK i could find was "All Purpose Fertilizer, 20-20-20" and i am not sure if 20-20-20 would be sufficent to use for nutrients for a cannabis plant.

     
     
  2. #2 Ẅest Čoast, Jan 17, 2014
    Last edited by a moderator: Jan 17, 2014
    the higher the numbers the higher the concentrate. So 20-20-20 has a higher concentrate than 15-15-15. You should use 1/4 the recommended dose when you start feeding your plants, as 20-20-20 is a hefty concentrate.
     
  3. #3 Cetyal, Jan 17, 2014
    1/4 a cup per how many liters of water?
     
  4. #4 greenbudguy, Jan 17, 2014
  5. #5 toastybiz, Jan 17, 2014
    20-20-20 has the same balance of NPK as 15-15-15, it's just more concentrated. Those numbers are literally percentages.
     
  6. #6 Guest55445566, Jan 17, 2014
    Last edited: Jan 17, 2014
    Those nutes will absolutally kill your plants if you try to give them 100% concentrations.  I use 3/2/4 for veg and 1/4/5 for flower and I do serious grows...  DO NOT USE WHAT YOU GOT UNLESS YOU DILUTE AT LEAST 1/4 AS SAID ABOVE!
     
    Buy these online if you really need guidance (The one in the midle is Cal-MAg supplementation..  Use it to sweeten your nugs and to ballance the Ph):

     
    View attachment 1325127
     
  7. #7 Cetyal, Jan 18, 2014
    Last edited by a moderator: Jan 18, 2014
    @[member="greenbudguy"] ok, i see it now, hes saying if it says 100 per 1L then i use 25 per 1L

    @[member="OneFreeMan"] ill think about buying online, but i think ill stick to trying the 20-20-20 and using much less of it, onece-twice every week or so?
     
  8. #8 greenbudguy, Jan 18, 2014
    Yup. 1/4 of the recommended dosage. Any time you use a new nutrient, always start with a lighter feeding than the recommended. You might be fine but always better to err on the side of caution and not hurt your girls

    current grow
    <a class="bbc_url" href="http://forum.grasscity.com/index.php?/topic/906719-greenbudguy's-%22perpetual%22-grow">http://forum.grasscity.com/index.php?/topic/906719-greenbudguy's-"perpetual"-grow</a>
     
  9. #9 Cetyal, Jan 18, 2014
    @[member="greenbudguy"] ill try not too! if i do then i learn from my mistakes^^ not like ill get everything perfect on my first time:)
     
  10. #10 greenbudguy, Jan 18, 2014
  11. #11 Cetyal, Jan 18, 2014
    I really have for the last month, still got 2 or so months of waiting game (start germinating late april, let it grow for 3 weeks indoor in may and hopefully if the weathers nice enough ill put it in the ground) till i can have some action,
     

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