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Help with possible nutrient issue

Discussion in 'Growing Marijuana Indoors' started by LiveWire420, Jan 26, 2019.

  1. #1 LiveWire420, Jan 26, 2019
    This is my second grow, first time hydro (DWC). Plant is a Gold Leaf from a seed from Robert Bergman. I'm using Fox Farms nutrients.

    Went to check this morning and found some leaves were yellow towards the tips with brown spots.

    I suspect a nutrient excess, but am not sure which one or how to deal with it. It isn't due for a flush until next week, but I might do it tonight anyway.
     
  2. #2 bkarnaze, Jan 26, 2019
    Without ppm and pH info, it's almost impossible to help.
     
    • Agree Agree x 1
  3. #3 LiveWire420, Jan 26, 2019
    pH is right around 6. EC is supposed to be 21-2300. I have two meters, one reads about 2000, the other about 1750.
     
  4. #4 MickFoster, Jan 26, 2019
    I haven't grown dwc in about 10 years so I'm no expert, but isn't 2000ppms too high? I never ran more than 700.
     
  5. #5 LiveWire420, Jan 26, 2019
    Here's the table from the nutrients. Their scale is different units than my meters. Their 2.0 is equal to 2000 on my meters.
     

    Attached Files:

  6. #6 LiveWire420, Jan 26, 2019
    PPM they are looking for is about 1400-1600. I'm going off EC.
     
  7. #7 MickFoster, Jan 26, 2019
    I have never heard of a ppm meter where 1.0 EC is equal to 1000 ppms. They're usually either 500 or 700 depending on manufacturer.
     
  8. #8 LiveWire420, Jan 26, 2019
    No, it's micro Siemens,I think, vs ppm, different scales.
     
  9. #9 LiveWire420, Jan 26, 2019
    Electrical conductivity (EC) vs total dissolved solids (TDS PPM). The chart I attached has EC first, then PPM. My meters read both, but I usually do EC.
     
  10. #10 MickFoster, Jan 26, 2019
    If your meter says 1.0 EC - what is the PPM?
     
  11. #11 LiveWire420, Jan 26, 2019
    500
     
  12. #12 MickFoster, Jan 26, 2019
    The table you posted shows 2.0 Ec at 1400 ppms, so obviously it's based on 700ppm = 1.0 Ec. So 2.0 Ec on your meter should be 1000ppms.

    In post #5 you said their 2.0 EC was equal to 2000 ppms on your meter. I'm confused.
     
  13. #13 LiveWire420, Jan 26, 2019
    Micro Siemens vs Milli Siemens, chart is in Milli, meter is in micro.
     
  14. #14 MickFoster, Jan 26, 2019
    I don't know anything about that but I do know EC and ppm's. If your meter is set up on a 500 scale like you said, then 2.0 EC equals only 1000 ppm's not 2000. Your chart is based on a 700 scale so it shows 2.0 EC as 1400 ppm's. EC is constant, it's only the ppm meters that screw things up by using different conversion methods.
     
  15. #15 LiveWire420, Jan 26, 2019
    I only use EC. I don't use PPM ever.
     
  16. #16 LiveWire420, Jan 26, 2019
    The lights don't come on for 7 hours, I'll give you both readings from my newer meter then.
     
  17. #17 MickFoster, Jan 26, 2019
    Then why did you say that 2.0 ec was 2000 ppm's on your meter? Good luck to you.
     
  18. #18 LiveWire420, Jan 26, 2019
    Because I was asked what the PPM was. My meter is in US/cm which converts to 500 PPM. I was trying to answer to the best of my ability...
     
  19. #19 LiveWire420, Jan 26, 2019
    I didn't say it was 2000 PPM, I said the chart was in Milli, 2.0, meter is in micro, which is 2000.
     
  20. #20 MickFoster, Jan 27, 2019
    Understood.
     

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