Results 1 to 4 of 4

Thread: brown spots on leaves with picture

  1. #1

    Join Date
    Nov 2016
    Posts
    42
    Thanks
    17
    Been Thanked: 40 Times

    Default brown spots on leaves with picture

    since i switched to nft, raised the humidity to 79%, lowered room temp to 68, lowered res temp to 66, have been keeping my ph at about 5.8-6.0, and have lowered my ppm to 240 for these young plants, and have started using hydroguard, my plants have been looking so soo green and healthy and have been growing like crazy! but today i noticed a drastic change in 2 of the largest leaves of the lower growth, brown spots! there are still plenty of healthy looking leaves, but i bet if we dont figure out what this is it will get worse soon, so help me please! pic below:
    https://i.imgur.com/bzOiB6y.jpg

  2. The Following 2 Users Say Thank You to Fogponics For This Useful Post:

    Glynne (02-01-17), kbag (31-12-16)

  3. #2

    Join Date
    Sep 2010
    Location
    East coast
    Posts
    18,691
    Thanks
    29,580
    Been Thanked: 39,862 Times

    Default

    Calcium defiency mate. Drop your ph to 5.6 and let it drift up to 6..1/2 before resetting again..That will stop progression..

    Sent from my SM-G930F using Tapatalk

  4. The Following 5 Users Say Thank You to B.A.BARACUS For This Useful Post:

    ballboy (10-02-17), Dazmandaz (31-12-16), Fogponics (31-12-16), Glynne (02-01-17), kbag (31-12-16)

  5. #3

    Join Date
    Nov 2016
    Posts
    42
    Thanks
    17
    Been Thanked: 40 Times

    Default

    wow that looks just like it! thanks mate!
    EDIT: wait a minuite! according to my chart calcium in hydro is only absorbed from 5.3 - 5.8!
    Last edited by Fogponics; 31-12-16 at 01:01 AM.

  6. The Following 3 Users Say Thank You to Fogponics For This Useful Post:

    B.A.BARACUS (31-12-16), Glynne (02-01-17), kbag (31-12-16)

  7. #4

    Join Date
    Jun 2014
    Posts
    4,711
    Thanks
    14,454
    Been Thanked: 9,472 Times

    Default

    To high room humidity can also cause calcium deficiency as can a to low room humidity. 79% R/H consistently will not be helping the sweet spot is 50-55% anything between 40-60% will suffice.

  8. The Following 2 Users Say Thank You to kbag For This Useful Post:

    c0bblep0t (31-12-16), Glynne (02-01-17)

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  


THCtalk.com Disclaimer - You must be over 18 years old to view/use this site .THCtalk.com does not encourage growing Cannabis or possessing Cannabis. Learning how to grow Cannabis instructions should be for educational purposes only. All Information contained in this web site is for: Historical reference, Scientific reference and Educational purposes only. Visitors to this website are advised against breaking the law as It is illegal to smoke, grow, or possess cannabis in the UK and some US States