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Anyone knows what causes this?

Discussion in 'Growing Marijuana Indoors' started by Oahu420, Apr 30, 2019.

  1. #1 Oahu420, Apr 30, 2019
    Leaves under the light seem to be getting darker With lighter green. Not sure what this is nitrogen toxicity? Thank you for your help. Week 7 flower temp lights on 76-78
    Lights off 72-74
    Rh 53-57
     

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  2. #2 trojangrower, Apr 30, 2019
    ?
    week 7 flower should be low on N nutes.
    if you post more pics, maybe I can help.
    welcome to GC @Oahu420
     
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  3. #3 smokeout69, Apr 30, 2019
    Yeah can u post pics of the plant/plants for us?

    Sent from my SM-J727P using Tapatalk
     
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  4. #4 Oahu420, Apr 30, 2019
    Thanks guys. I am using roots organic soul bloom,peak,infinity,big swell and cal mag. Runoff when watered today is at 5.8 and 1330 ppm 500scale.
     

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  5. #5 trojangrower, Apr 30, 2019
    nice plants, I think what you have is a phosphate thing... like much of it. I'm not 100% but yea.
    like i said earlier, you should be weaning them off N at this stage of the game.
     
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  6. #6 Oahu420, Apr 30, 2019
    Thank you. I will look into that. Maybe got a lockout from to much nitrogen? How do I lower the nitrogen. I’m following the soul grow feeding schedule at half the recommended dosage.
     

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  7. #7 trojangrower, Apr 30, 2019
    I would just feed them this:
    upload_2019-4-30_3-3-19.png

    The numbers are NPK, so 0-10-7 has lots of P and K, whereas 0.5-2.5-1.5 has a 1:5:3 ratio for a little nitrogen, not that you need it.
    You are just about done, and at this point, growers use finishers which are rich in K and P, but low (or no) Nitrogen.
    If you are adding calmag solution, theres probably enough N to hold you to the end in it, so just use the second bottle for a week or so (along with calmag solution).
    I do notice that there is quite a bit of P in those nutes too btw...
    a lot of people use Mick's coco method, where he only uses MaxiBloom from start to finish and that is 5-15-14. It has about the same P as K, so 1:3:3 ratio. Just for comparison.
    Mick's Coco - K.I.S.S. - Scrog Method
     
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  8. #8 Oahu420, Apr 30, 2019
    Sorry the bottle that cut off is 1-4-3. I will try it on my next feeding.

    I thinking I’m gonna try coco on my next run. I have some in veg but in Roots Organics roots original.
    Thank you for your help!
     
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  9. #9 Papa Puff, Apr 30, 2019
    Roots 707 soil? A top grower on here ran into problems with that soil. During flower it kept producing nitro. It had to have some kinda release stuff in it. I would water . Than next cylce they should be hungry. Do a slurry test and see if that soil still has high ppm's left. Normally plants will eat a feed and than either not quite eat it all or may be hungry next feed/water.
    Take a large shot glass of soil from plant when somewhat dry. Take the same amount of distilled water and put in a cup. Stir and stick both meters in there. True pH and ppm


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  10. #10 Oahu420, Apr 30, 2019
    It’s the roots original. But everywhere I read says the soil is acidic right out of the bag. But I will do that test on my next watering. Should I up my ph or is it ok with runoff at 5.8? Thank you
     

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