Yellow-Brown spots om my leafs

Kisskorv said:

Hello fellow growers. I Have discovered, small yellow-brown spots on some of my leafs. About 10 of the 30 you see in the picture. This is the first time I use LED (Spider Farmer SF4000) I followed the instructions in the beginning and hung it at 60 cm (24inch) and dim it down to 40%. A couple of days later I saw these spots. I raise to 90 cm (35inc) It has now been about two weeks. I have fed them twice with ROOTS PH 5.9-6.0 EC 0.1 Room temp during the day 23 ° (73F) Night 18 ° (64F) Humidity 60-65% I have five runs under my belt. I been using MH 600w veg 600w HPS Bloom. Anyone know what the problem might be?

Regards
KissKorv

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Cottam97 said:

Hi mate, are you using any cal mag in your feeds? That symptom you’ve described (small yellow and brown spots) is the start of a magnesium deficiency. If you aren’t using any cal-mag I 100% recommend when using LED lighting systems. Hope this helps mate

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Bernie420 said:

wouldnt worry about it too much ...young plants like that are/might/going to have issues because the root system isnt established yet.

Was going to say nute burn but 50 ppms probably isnt going to do it maybe feed it 150 ppms next time, could be a mild case of P deficiency.

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