Does this look like a magnesium issue?

firsttimeARE · Jan 12, 2013

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Plant is getting 3ml/gal calmag+ and the rest Ionic Grow. I keep PH around 5.8 and the feed is .75EC, but then it dropped to around .7EC in 48 hours so I upped to .85EC.

DWC, each bucket getting 10LPM of air.

Basically I see these spots on a lot of my grows and people say too much nutrients or PH issues. But the feed is dropping, which means i'm feeding too low and I check my PH every day. Usually its at 5.8 unless the nutes are dropping then its like 6.1 at most.

firsttimeARE · Jan 12, 2013

This is how they looked earlier before it grew more and I took that badly affected leaves off(they were papery and brittle and basically dead). This was when they were getting 1.5ml/gal Calmag+

I think its recovering now and thats just left over marks.

LadyJane420 · Jan 12, 2013

firsttimeARE said:
View attachment 2477588 View attachment 2477589 View attachment 2477590 View attachment 2477591
Plant is getting 3ml/gal calmag+ and the rest Ionic Grow. I keep PH around 5.8 and the feed is .75EC, but then it dropped to around .7EC in 48 hours so I upped to .85EC.

DWC, each bucket getting 10LPM of air.

Basically I see these spots on a lot of my grows and people say too much nutrients or PH issues. But the feed is dropping, which means i'm feeding too low and I check my PH every day. Usually its at 5.8 unless the nutes are dropping then its like 6.1 at most.

I've run into a few of cal-mag roadblocks before and that looks exactly like what it is. The rust spots give it away.

To fix this, I started to add about 200-250 PPM of Cal-Mag to my res, prior to adding anything else. R.O. comes in at about 17PPM, add CalMag until ~250PPM, then add the rest.

firsttimeARE · Jan 12, 2013

Yeah I will also note that looking back at older pictures I can see the interveinal chlorosis before the spotting.

Oh and which scale do you use to measure your ppm?

LadyJane420 · Jan 12, 2013

firsttimeARE said:
Yeah I will also note that looking back at older pictures I can see the interveinal chlorosis before the spotting.

Oh and which scale do you use to measure your ppm?

.5 scale, basic TDS-EZ meter.

firsttimeARE · Jan 15, 2013

LadyJane420 said:
.5 scale, basic TDS-EZ meter.

Plant went down to .75 ec from .85 so i upped to 1.0 about 48 hrs ago. Today at .95 and the spots are progressing. I switched from ionic to dynagro and feeding the same as my other plant i switched from ionic that is recovering. Im pushing the other plant at 1.1 and its ec is still dropping but leaves are green.

The plant i just switched is getting worse. So do these spots look like mg?

Does this look like a magnesium issue?

firsttimeARE

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