Tricky to diagnose - Nitrogen def? Nute lockout? Magnesium? Manganese?

Discussion in 'Marijuana Plant Problems' started by SpiceWeasel, Jul 28, 2010.

  1.  
    SpiceWeasel

    SpiceWeasel Member

    Hi All,

    Appreciate some help from my fellow growers! :)

    I have some yellowing of lower leaves and some yellow and browny spots appearing both in the centre and at the edges of the leaves. Accompanying this is the central 'vein' of the leaf going a light yellow/white colour - which is kinda what throws me, as Nitrogen deficiency and others talk about dark green veins.. also why are the spots yellow and brown but in the centre of the leaves mainly (certainly not outside in at any rate) and only on the bottom fan leaves or lowest ones and not on top or all over?

    I have also had occasional drooping of lower leaves sometimes - which I have taken to be needing water - and which have pretty much gone away once the plant is watered..

    Plants have been generally healthy so far and quick growers more or less.. but circumstances force me to set them to early flowering (one week in now), where I move them indoors to a dark space for 12-13 hours every day.

    It is affecting one plant mainly, the second one a little and the third one hardly at all - but there are some signs.

    It seems too early to be the natural Nitrogen deficiency of flowering (only one week into light cycle change) so I am slightly confused about what it is..

    It looks a little like several things: Nitrogen deficiency, Magnesium deficiency or even Manganese deficiency.. also could it be a bit of under or over feeding? Is it a bit of Nute lockout?
    Or is it a combination of problems? Bugs and nutrients?

    Here are some pics, and I'd appreciate any considered responses as I'm kinda scratching my head here..
    IMG_0840.jpg IMG_0837.jpg IMG_0842.jpg IMG_0831.jpg IMG_0830.jpg IMG_0843.jpg IMG_0839.jpg IMG_0838.jpg IMG_0836.jpg

    Thanks for your help!!! :)


    Details of plants :
    SOIL

    How long has this problem been going on? 2 weeks
    What STRAIN are you growing? Swiss Bliss
    What was the establishing technique? (seed or clone?) Seed
    What is the age of your plants? 11 weeks
    How long have they been in the soil mixture they are in now? 10 weeks
    How Tall are the plants? about 2 feet
    What PHASE (seedling, vegetative or flower) are the plants in? Early flowering started 1 week ago
    What Technique are you using? (SOG, SCROG etc) Soil - 8" pots
    What substrate/medium are you using? What brand of soil mixture are you using?(percentage of perlite, vermiculite...etc?) Standard gardening centre general purpose potting compost/potting mix.
    What Nutrient's are you using? Maxi Crop Extract of seaweed plus - all purpose garden food (5-5-5)
    How much of each nutrient are you using with how much water? About a capful in 6 litres of water
    How often are you feeding? once a week
    What is the TDS/EC/PPM of your nutrients used? Umm not sure
    What is the pH of the "RUN-OFF"? Not sure, soil pH (measured about 10cm down) is around 7.0
    What method of pH test was administered? Using Strips? pH pen? I have a cheap soil testing kit
    How often are you watering? normally twice a week but occasional wilting of lower leaves in warm weather means I top it up every few days..
    When was your last feeding and how often are you feeding? Last feeding was about 4-5 days ago
  2.  
    max316420

    max316420 Well-Known Member

    it is common for bottom fan leaves to look like this and even die and fall off. they look really healthy to me
  3.  
    inyourhead

    inyourhead Member

    in figure 8 that is bug damage, they are flyers i forget what they are called, no threat to your plants but theyll make you worry its a trail slug pattern, they dont nest and dont multiply to kill your plants.
    SAME with figure 9 that interveinal damage isnt from anything other than the bug that landed on it was smart enough to get its energy from the source stem.

    DEFINITELY DONT PANIC AND OVERFEED YOUR PLANTS. IF ANYTHING SKIP YOUR NEXT FEED DATE. TEST YOUR SOIL THOUGH TO BE CERTAIN I HEARD NEW GROWTH BEING NEON GREEN IS N DEFICIENT

    THEY LOOK A LITTLE OVERWATERED TOO THE EDGES KIND OF CURL UNDERNEATH IT, KINDA LIKE THEYRE GONNA HURL. LET THE MEDIUM DRY OUT A BIT MAYBE RAKE THE TOPSOIL UP. IF YOU LET YOUR PLANTS GO WITHOUT WATER WHEN THEY ARE OVERFED THEY BURN MORE QUICKLY I HAVE NOTICED SO LET EM GO WITHOUT WATER AND IF SYMPTOMS INCREASE U HAVE TO MUCH IF THEY DONT YOU PROLLY NEED SOME N N N NITRO GOODLUCK MATE

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