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Thread: Advice on yellowing leafs

  1. #1

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    Default Advice on yellowing leafs

    My set up.
    Coco grow, hps lights , using shogun nutes. Feeding a ec of 1.4. My background ec is 0.7.
    Four plants in the tent. Other three seem healthy and good but seeing this on one.
    Do u think under or over feeding is affected it. Click image for larger version. 

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  3. #2

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    Hungry. May have lock out or salt build up.

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  5. #3

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    Looks like Magnesium deficiency. Spray daily with Epsom salt solution (1/2 tsp to 1 liter of water). It won't help these leaves, but the new growth should look better.

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  7. #4

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    Quote Originally Posted by Old Skool Dude View Post
    Looks like Magnesium deficiency. Spray daily with Epsom salt solution (1/2 tsp to 1 liter of water). It won't help these leaves, but the new growth should look better.
    Thanks for the reply. My background ec is high 0.7. I don't use cal mag because of this. Do you recommend just spraying that one plant and not the others. Would it hard them if I did.?

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    Quote Originally Posted by Jake hammer View Post
    My set up.
    Coco grow, hps lights , using shogun nutes. Feeding a ec of 1.4. My background ec is 0.7.
    Four plants in the tent. Other three seem healthy and good but seeing this on one.
    Do u think under or over feeding is affected it.
    How old are the plants?

    Are you making sure to water every day?

    Do you water until at least 20% runoff?

    Have you tried testing the runoff of the water?

    Your background water is high in calcium no doubt, which may actually be contributing in locking out the magnesium (too much calcium locks out magnesium), the leaves are showing what looks to be a magnesium deficiency so a foliar spray of epsom salts will introduce magnesium (and sulphur) without the calcium (don't use calmag).

    Spray plants with an epsom salts mix around 1 hour after lights on as this is when the stomata in the leaves will be fully open and receptive then raise the light, mist/spray the plants and ventilate well till the plants are dry then lower the lamp back down.

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  11. #6

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    Quote Originally Posted by Jake hammer View Post
    Thanks for the reply. My background ec is high 0.7. I don't use cal mag because of this. Do you recommend just spraying that one plant and not the others. Would it hard them if I did.?
    I spray every plant that I have grown with this solution nearly everyday.

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    GEORGE (09-05-21)

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