Need help diagnosing spots on leaves

I believe they are light burn but I am not sure. Any help will be greatly appreciated. Thanks in advance.

Get some other opinions but looks to me like an Mg issue.

It has just started and is only on the top leaves closest to the lights if that helps.

Th

Old_fart_stoner said:

Get some other opinions but looks to me like an Mg issue.

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Thank you for the info. Much appreciated

Skillcraft said:

It has just started and is only on the top leaves closest to the lights if that helps.

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Take a pic of the entire plant. Mg and Ca usually show in the middle of the plant, Mg shows as interveinal chlorosis and Ca as punctate brown/rust spots.

Looks like a calcium deficiency.
What is your medium and feeding schedule?

curious2garden said:

Take a pic of the entire plant. Mg and Ca usually show in the middle of the plant, Mg is shows as interveinal chlorosis and Ca as punctate brown/rust spots.

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curious2garden said:

Take a pic of the entire plant. Mg and Ca usually show in the middle of the plant, Mg is shows as interveinal chlorosis and Ca as punctate brown/rust spots.

Click to expand...

MickFoster said:

Looks like a calcium deficiency.
What is your medium and feeding schedule?

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MickFoster said:

Looks like a calcium deficiency.
What is your medium and feeding schedule?

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It is growing in dwc. Using flora series full line. I run it at 1000 ppm and keep humidity around 50%. I have 2 electric sky 180s for lighting. I keep my lumens around 92k and am keeping 13 hours of darkness. I hope this is enough info. Thank you for your replies.

Beautiful plant.
I'm no expert but it doesn't look like light burn.
Are you adding a calcium/magnesium supplement?
What is your water supply?

Wait it out a couple of days. Early signs of a problem are hard to read sometimes. You could always add Cal mag until you have 11-1200ppm as a preventative measure. Just as long as you dont have precipitation and fallout. its almost impossible to burn a plant with Cal mag.

Thank you for the info. Much appreciated

Skillcraft said:

Thank you for the info. Much appreciated

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Is your pH remaining stable? If not how long after adjustment before it starts to drift? And what do the roots look like? Standard question in DWC when there’s issues.

hotrodharley said:

Is your pH remaining stable? If not how long after adjustment before it starts to drift? And what do the roots look like? Standard question in DWC when there’s issues.

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My ph is stable at around 6.my root

hotrodharley said:

Is your pH remaining stable? If not how long after adjustment before it starts to drift? And what do the roots look like? Standard question in DWC when there’s issues.

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My roots look great. The ph stays between 6.0 - 6.3.