Page 1 of 2 1 2 LastLast
Results 1 to 10 of 19

Thread: Could this be Phosphorus...?

  1. #1

    Join Date
    Jan 2009
    Posts
    1,851
    Thanks
    106
    Been Thanked: 356 Times

    Default Could this be Phosphorus...?

    My Lowryder has developed what I think may very well be a Phosphorus issue, she's not long into flowering 2.5-3 weeks give or take a day.
    She's in a 7.5 litre pot with unbranded general purpose peat free "Green Waste" (high in Nitrogen) based compost, I'm feeding with Bio-Bizz Organics, Bio-Bloom 4ml/1.5L, infact I've fed the Lowryder less than my Auto Lemon Haze and that hasn't had any problems at all... Well, apart from the usual yellowing considering shes 4 weeks into the flowering cycle, and they are only one or two of the smaller fan leaves at the bottom anyway... I digress!
    For some reason the Lowryder dosen't "appear" to be doing much, which is strange considering it's about 4 foot tall (probably all that Nitrogen in the "green waste" compost), it has also been hitting 50°C in direct sunlight too in my back yard as there is no shade anywhere until mid afternoon. So, at first I was thinking maybe some sort of heat strees (I removed another leaf which started out in exactly the same way, directly opposite the one in the photo, but it wasn't displaying the discoloured patches at the time), then the Black/Brown patches started to apper, which now makes me think Phosphorus...?
    Any help/advice greatly appreciated...

    Click image for larger version. 

Name:	Lowryder 1.jpg 
Views:	213 
Size:	683.6 KB 
ID:	427900


    3000 years ago, the Scythians, who lived north of the Black Sea, produced intoxicating vapours by throwing Cannabis onto hot stones.

    Marching On Together! #ALAW...

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

    B1unt (18-08-22), barney_b (15-08-22), Bud Lightyear (15-08-22), CityDweller (17-08-22), Deku Nut (15-08-22), GEORGE (15-08-22), mpsj (15-08-22), V8 (15-08-22)

  3. #2

    Join Date
    Jan 2014
    Location
    Who Knows
    Posts
    28,652
    Thanks
    620,412
    Been Thanked: 90,468 Times

    Default

    It's either over feed or over watered. JMO

  4. The Following 6 Users Say Thank You to GEORGE For This Useful Post:

    B1unt (18-08-22), Bud Lightyear (15-08-22), CheapHomeGrown (21-08-22), CityDweller (17-08-22), Deku Nut (15-08-22), V8 (15-08-22)

  5. #3

    Join Date
    Jul 2020
    Posts
    6,097
    Thanks
    13,178
    Been Thanked: 13,071 Times

    Default

    Click image for larger version. 

Name:	49D8C1B1-A782-4A17-A667-E5BF63979B0D.jpeg 
Views:	112 
Size:	404.3 KB 
ID:	427903

    If it’s just that one leaf I wouldn’t stress about it
    B1unt XIII: Chemdogging & Sour Diesel - https://www.thctalk.com/cannabis-for...post1071304159

  6. The Following 9 Users Say Thank You to B1unt For This Useful Post:

    barney_b (15-08-22), Bud Lightyear (15-08-22), CityDweller (17-08-22), Deku Nut (15-08-22), GEORGE (15-08-22), MonsterEnergy (17-08-22), Shaun (15-08-22), Steptoe (15-08-22), V8 (19-08-22)

  7. #4

    Join Date
    Jan 2009
    Posts
    1,851
    Thanks
    106
    Been Thanked: 356 Times

    Default

    I forgot to add, there's no purpling to the stem or leaf stems, yet...

  8. The Following 7 Users Say Thank You to Steptoe For This Useful Post:

    B1unt (18-08-22), barney_b (15-08-22), Bud Lightyear (15-08-22), Deku Nut (15-08-22), GEORGE (15-08-22), Shaun (15-08-22), V8 (15-08-22)

  9. #5

    Join Date
    Nov 2010
    Location
    Star Command
    Posts
    26,693
    Thanks
    65,467
    Been Thanked: 79,865 Times

    Default

    Bio-Bizz base nutes are formulated to be used in conjunction with each other, you still need to use the grow component along with the bloom in the flowering phase because it contains micro elements...Check the current feed guide though as they may have changed it since last I looked..Flush the pot 3x the pot size with plain water then once the medium has dried out in 2 or 3 days start to feed as per bio-bizz feed instructions...Better still dump the bio-bizz and switch to plant magic old timers, it's more user friendly and a much better product in my opinion...


    Regards BL

  10. The Following 7 Users Say Thank You to Bud Lightyear For This Useful Post:

    barney_b (15-08-22), Deku Nut (15-08-22), GEORGE (15-08-22), MonsterEnergy (17-08-22), Shaun (15-08-22), Steptoe (15-08-22), V8 (15-08-22)

  11. #6

    Join Date
    May 2022
    Posts
    66
    Thanks
    25
    Been Thanked: 317 Times

    Default

    50C!! and I can see a white reflective brick wall in the background and that will bounce heat back to the plant. Im surprised it looks as good as it does. No wonder you're having problems. In our summer I regularly suffer shade temps of 35C but in the open sun it can register 45C to 55C. I've actually walked in a salt pan that registered 65C in the truck with the windows open. You MUST find a way of getting that leaf exposure temp to less than 35C. Otherwise you'll never have a solution to any other problem. Use shade cloth, leafy twig branches in a 'tent" or what ever. But until you get that temperature down you'll lose. No point in messing around with nutes and water if ya dont get that temp down. Any plant of any kind can't suck up enough cooling water to replace the water it transpires at the temperature - unless its Australian saltbush. 50C in the sun, that's Sahara Desert or Death Valley stuff - in winter!

  12. The Following 6 Users Say Thank You to doleritejack For This Useful Post:

    barney_b (15-08-22), Bud Lightyear (15-08-22), Deku Nut (15-08-22), GEORGE (15-08-22), Steptoe (15-08-22), V8 (15-08-22)

  13. #7

    Join Date
    Jan 2009
    Posts
    1,851
    Thanks
    106
    Been Thanked: 356 Times

    Default

    Quote Originally Posted by doleritejack View Post
    50C!! and I can see a white reflective brick wall in the background and that will bounce heat back to the plant. Im surprised it looks as good as it does. No wonder you're having problems. In our summer I regularly suffer shade temps of 35C but in the open sun it can register 45C to 55C. I've actually walked in a salt pan that registered 65C in the truck with the windows open. You MUST find a way of getting that leaf exposure temp to less than 35C. Otherwise you'll never have a solution to any other problem. Use shade cloth, leafy twig branches in a 'tent" or what ever. But until you get that temperature down you'll lose. No point in messing around with nutes and water if ya dont get that temp down. Any plant of any kind can't suck up enough cooling water to replace the water it transpires at the temperature - unless its Australian saltbush. 50C in the sun, that's Sahara Desert or Death Valley stuff - in winter!
    I know Doleritejack, it dosen't usually hit 50°c here in the UK, I do drape some green scaffold netting down behind them to try and combat the heat reflection, hence the reason they're double potted too, to keep them off the hot patio slabs, but they're in the best corner in my yard to grow, as it's tucked away out of sight behind my conservatory and it's a proper old sun trap, but this heatwave we're currently having is being a right old pain!

  14. The Following 5 Users Say Thank You to Steptoe For This Useful Post:

    B1unt (18-08-22), Bud Lightyear (15-08-22), Deku Nut (15-08-22), GEORGE (15-08-22), V8 (15-08-22)

  15. #8

    Join Date
    Jan 2009
    Posts
    1,851
    Thanks
    106
    Been Thanked: 356 Times

    Default

    Quote Originally Posted by Bud Lightyear View Post
    Bio-Bizz base nutes are formulated to be used in conjunction with each other, you still need to use the grow component along with the bloom in the flowering phase because it contains micro elements...Check the current feed guide though as they may have changed it since last I looked..Flush the pot 3x the pot size with plain water then once the medium has dried out in 2 or 3 days start to feed as per bio-bizz feed instructions...Better still dump the bio-bizz and switch to plant magic old timers, it's more user friendly and a much better product in my opinion...


    Regards BL
    Thanks for that bit of info about the bio-bizz nutes Bud, of course it means that I've just learned that I've been using Bio-Bizz wrong for years...
    Good job you popped your head through the door chap...

    There's always something to learn no matter how expirenced you may think you are...

  16. The Following 6 Users Say Thank You to Steptoe For This Useful Post:

    B1unt (18-08-22), Bud Lightyear (15-08-22), Deku Nut (15-08-22), GEORGE (15-08-22), mpsj (15-08-22), V8 (15-08-22)

  17. #9
    Bejeweled 2 Action Champion!
    Join Date
    Oct 2017
    Location
    Mare Nubium
    Posts
    5,458
    Thanks
    23,605
    Been Thanked: 18,391 Times

    Default

    just like buzz said most switch nutrients to early,
    whilst the plant is in the early stages of 'flower' is when grow is needed the most

    if it's just a few leaf spots low down i wouldn't worry, those lower leaves will all drop off in a few weeks anyway
    plant is looking nice and healthy so far

    keep it up and you'll be smoking her in no time

  18. The Following 4 Users Say Thank You to MonsterEnergy For This Useful Post:

    B1unt (18-08-22), Deku Nut (18-08-22), GEORGE (17-08-22), Steptoe (18-08-22)

  19. #10

    Join Date
    Mar 2009
    Posts
    62,173
    Thanks
    177,540
    Been Thanked: 196,780 Times

    Default

    Long time no see Monster, I hope things are good with you
    It's Not What You Know, It's What You Can Prove

  20. The Following 5 Users Say Thank You to M_C For This Useful Post:

    B1unt (18-08-22), Deku Nut (18-08-22), GEORGE (17-08-22), MonsterEnergy (17-08-22), mpsj (17-08-22)

Page 1 of 2 1 2 LastLast

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