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Thread: First grow - lower fan leaves yellowing

  1. #1

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    Default First grow - lower fan leaves yellowing

    Hi all,

    Sorry for second thread post but different problem on my second plant. I've been going through the pictures of excess / deficiency. I can't quite decide if I've got nitro deficiency or it's nute burn. My lower fan leaves are all starting to yellow and brown up.

    Growing Medium: Soil
    Strain: Speedy Chile (Royal Queen Seeds)
    Photo or Auto: Photo
    Plant age: 9
    Quantity: 1
    Indoor/Outdoor: Indoor 60cm x60cm Grow Tent. 250W bulb. Only one other plant in there with it (Quick one auto)
    Location: UK
    Nutrients: Growers Ark Soil Hard Water Bloom. Royal queen seeds easy bloom booster (Only used a handful of times in last 3 weeks). Used Baby bio during veg.
    Light schedule: 16-8 (1-5 weeks); Current Schedule 12-12

    There is also a few little critters on it. Which i posted up just in case. But jingo already cleared that up as likely aphids in other thread. Appreciate any help!

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  3. #2

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    Overall you might be just a cut nitrogen toxic, those bottom leaves could have been an earlier indication of nitrogen toxicity or other things. there could have been some overwatering in the past or you've got some nutrient lockout, which would be common if you're not watering to run off or if the plant is reserving the runoff after you water.

    I think overall your plant looks really good and it's close to finishing, you may want to look at any bloom nutrients you have and see if they're high in nitrogen. It would be better not to feed any nitrogen from here on out. That will probably accelerate the yellowing. But that's really kind of natural towards the end.



    J

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  5. #3

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    Thank you once again kind sir! Appreciate it

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  7. #4

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    Hey this problem still seems to be ongoing / potentially getting worse on the bigger fan leaves? any cause for concern?



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    Well clearly there is a progression of whatever the issue was before. When you have a problem that begins at the bottom and it spreads from the bottom then it's a mobile nutrient problem.

    How much N are you feeding? It's normal for your lower leaves to go pale towards the end of growth because you're purposely cutting back on the nitrogen the more you flower.

    Your leaves have a slightly different color quality than what I usually expect to see when it's a simple nitrogen deficiency.

    Have you done any flushes? It could be worthwhile to do a good flush and come back in with some weaker veg nutrients and hold the bloom boosters for a watering or two and just feed basic nutrients and observe the plant for awhile.

    You also want to make sure that you are getting good run off every time you feed and water. If not, the minerals that exist in your water will build up in your soil and it will cause odd issues. It's another form of lockout that comes from not what you're feeding but just what's in your background water.



    J


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    Feeding 2.5ml / litre of water: N 2.2% / P 0.5% / K 3.2% . Normally feed about 2 litres per 3 days and there is run off. I'd say its more 5-10% run off

    Haven't done any flushes. I could do one today though and start again with the feed? I have some veg feed which is 10.6:4.4:1.7 that i could resupplement with after the flush?

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  13. #7

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    Quote Originally Posted by jgoods View Post
    Feeding 2.5ml / litre of water: N 2.2% / P 0.5% / K 3.2% . Normally feed about 2 litres per 3 days and there is run off. I'd say its more 5-10% run off

    Haven't done any flushes. I could do one today though and start again with the feed? I have some veg feed which is 10.6:4.4:1.7 that i could resupplement with after the flush?
    I think a flush would be a good idea, I have a feeling you've got a lot of built-up minerals in your soil. I would definitely use your veg nutes, to give more nitrogen this time around and maybe for a couple feedings but I would keep the feed weak. you'll have to decide what constitutes week cuz you're the one in your environment.

    Then after two or three feedings just on the weaker veg nutes I would try switch back over the blue and see how it looks.

    this may be something that you're going to see with every crow that you do, it may be something very specific to your environment or your background water and you're going to have to figure out how to make the adjustments.

    When I was growing in very hard water background EC about 1.5, I used to do three repots with no feeding at all until about the last half of flower.



    J


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  15. #8

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    If you had any distilled water or access to reverse osmosis water that would be great stuff to use for a flush.



    J


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    I do have water filters i can use to put the water through prior to flush. Have a friend that grows that has more experience and he says he has similar issues with the water being super hard in our area. Will definitely give the flush a go and see what happens.

    I do wonder - I'm using aero / fabric pots. Might it be that blocking nutrients leaving since there's no specific holes?

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  19. #10

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    Quote Originally Posted by jgoods View Post
    I do have water filters i can use to put the water through prior to flush. Have a friend that grows that has more experience and he says he has similar issues with the water being super hard in our area. Will definitely give the flush a go and see what happens.

    I do wonder - I'm using aero / fabric pots. Might it be that blocking nutrients leaving since there's no specific holes?
    If you're getting good run off with those fabric pots usually they will be soaking wet all the way down the sides, that's really the way I look at getting good run off in my fabric pots I don't look at the percentage I look at the sides getting soaking wet and then water running out the bottom.



    J


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