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Help Autoflower leaf cupping

Discussion in 'Marijuana Plant Problems' started by Mike325, Nov 8, 2017.

  1.  
    Mike325

    Mike325 Member

    These are ww xtr autoflower about 27 days temp is 77, RH 32%-40% there in soil (bio buzz light and ffoc)
    2x600w hid been just giving ph water except for 3 days ago I gave them a light feed of 10ml in 5g of AN grow and 5ml of calmag in 5g water anybody??? AA586B0A-8DA3-4DEE-AA27-21CC7114E622.jpeg
     
  2.  
    leather lungs

    leather lungs Well-Known Member

    Might be heat stress too close to light
     
  3.  
    Ludi

    Ludi Well-Known Member

    that picture sucks, but yea it looks like heat stress.
    Your lamp is to close.

    Edit: tie ´em down;)
     
  4.  
    Lite

    Lite Well-Known Member

    what is your humidity? I remember this one by thinkin the plants in a desert, and its making cups for water.

    low humidty causes cupping typically
    light burning looks a lot more like nitro burn to me with twisting of the leaves, not cupping generally. the cupping people might see with light burn is just due to the extremely low humidity by the lights.
     
    Dabber68 likes this.
  5.  
    vostok

    vostok Well-Known Member

    RH 32%-40%

    try 55-70% plus a small fan will help

    good luck
     
  6.  
    Lite

    Lite Well-Known Member

    oh my bad, i never read the details. sorry. too low RH. Get up 55+
     
  7.  
    Ludi

    Ludi Well-Known Member

    Those are your details.
     
  8.  
    Lite

    Lite Well-Known Member

    i'm more of a picture book kinda girl/guy?
     
  9.  
    Ludi

    Ludi Well-Known Member

    Visuals are cool, i have a need to feel to, like all.

    HAHAHA XYZCBA


    I WILL KILL YOU:

    Ok you are forgotten.
     
    Last edited: Nov 8, 2017
  10.  
    Mike325

    Mike325 Member

    Sorry picture quality sucks. Snapped the pic. With lights on. I have two cool mist humidifiers going but it only raises the humidity a little. Without humidifiers it’s like 26% with them running it’s between 32 to 43. Any ideas? I can get more pics with regular lighting if that’ll help. Some of the lower leafs have a papery dry feeling. Also just a slight and I mean a slight bit of yellowing on tips of new growth
     
  11.  
    Lite

    Lite Well-Known Member

    are those water droplets on the leaves a normal thing for you? and what is your exhaust situation, rather, is tis a sealed grow tent? or an open area?
     
  12.  
    Mike325

    Mike325 Member

    It’s a sealed tent. Good exhaust and intake. Temp. @ 77. It’s the humidity I’m having problems with. Already got two cool mist humidifiers in there. The actual leaf tempature is 72-75 used an infrared gun.
     
  13.  
    Lite

    Lite Well-Known Member

    its low humidity stress, i am currently battling the same condition. You can kill back your lights or figure out a way to humidify. I will let you know if I figure out a good solution that I will actually accomplish. Ideally we need a closed loop circuit with c02, an air conditioner (window unit works), a plenum (metal duct box), humidifier, duct, ductfan.
     
    Mike325 likes this.
  14.  
    Mike325

    Mike325 Member

    In the ideal setup...lol.
     
  15.  
    Buba Blend

    Buba Blend Well-Known Member

    Do you have glass covers on your lights?
    I can only speak from my own experience. I have had humidity in indoor grows average 25-30% in veg while all the other conditions were good and there was good air movement and I always had happy healthy plants. Maybe different strains act differently but I don't think humidity is the problem. It is more likely to be heat stress or a lack of proper ventilation or proper circulation IMO.
     
  16.  
    Mike325

    Mike325 Member

    361F797C-129F-43B9-9AFE-B751710B8DC5.jpeg
    Yes there cool tubes. 600w x 2.
     
    Buba Blend likes this.
  17.  
    Mike325

    Mike325 Member

    I think I was overwAtering. As I actually pulled this plant out of the pot and looked at the roots. The roots are white but the soil is still moist feeling inside. I think the roots are getting oxygen deprived and that’s the cause of all my problems. Any thoughts?
     

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