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Yellowing on top leaves

No curling, no brown spots, just yellow that starts from the stem of the leaf and working its way out. Plant looks nice, green and juicy. Does this indicate that the light is too close? Or, does it mean that I need to add some more plant food? Or sulfur deficiency? I am growing in a aeroponic system.

The problem actually looks a lot like this, which is labeled as a sulphur deficiency by this pic. But maybe one of the other indicators that I mentioned also....

Yellowing on top leaves
November 10, 2017 at 02:14PM

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4-5 days ago leaves started doing an upward taco effect only in my veg. I have 3 wall fans, and a mini split to keep the room controlled. Temps are between 78-81 with 51-76% humidity


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What is this? What causes it? Should I be concerned?