Resisting the urge to CALMAG

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bluegill

Well-Known Member
GH series nutes. I was running 1 tsp of micro, grow, and bloom per gallon. Yesterday, I started seeing slight yellowing on the leaves. pH was 7.5. I dropped the pH to 6.0, added another 1 tsp/gal of micro, and another 2 tsp/gal of gro. Today, the yellowing is more pronounced.

It looks like a magnesium deficiency. Still learning about nutrients and need some help with this guys!

3 days ago:
20220210_214631_scrubbed.png

Today:
20220213_160734_scrubbed.png
 
bk78

bk78

Well-Known Member
New growth looks green and healthy. I wouldn’t be adding or subtracting anything else at this point. Keep your ph stable and all should be good.
 
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bluegill

Well-Known Member
bk78 said:
New growth looks green and healthy. I wouldn’t be adding or subtracting anything else at this point. Keep your ph stable and all should be good.
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Doesn't Mag deficiency usually start on older growth, though? Hoping it doesn't spread upward
 
bk78

bk78

Well-Known Member
bluegill said:
Doesn't Mag deficiency usually start on older growth, though? Hoping it doesn't spread upward
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The only thing I see in maybe a N deficiency, but you’ve since upped your feed so should be good as I said. It’s not going to fix itself in a day
 
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bluegill

Well-Known Member
bk78 said:
The only thing I see in maybe a N deficiency, but you’ve since upped your feed so should be good as I said. It’s not going to fix itself in a day
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I did recently swap resos and ran just tap water for a day. I wonder if it's probably that that caused this
 
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bluegill

Well-Known Member
I decided to prune anything that was > 50% yellow or dead - which was the cotelydons, first true leaves, and first set of 3. These leaves weren't really getting any light. I had a hell of a time getting to them. I feel like this image better represents the true colors of the situation.
20220214_014305_scrubbed.png
 
70's natureboy

70's natureboy

Well-Known Member
1 tsp/gal is plenty strong for that size. Maybe look up the GH feed charts and you could tweak it a little. The charts on the bottle seems too strong but they have other feed charts.
 
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Apalchen

Well-Known Member
bluegill said:
I did recently swap resos and ran just tap water for a day. I wonder if it's probably that that caused this
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Yes, looks like dwc? Plants in dwc turn very fast no reason to ever run without nutes unless you feel like it the last few days.

Nice thing about dwc is if your having issues and the roots are still white your all good. Just dump it out and start fresh with water right where it should be.

Buy a ppm meter and quit guessing at your doses of fertilizer.

PH 5.5-6 and 400-500 ppm is what I’d be running that size plant at in dwc.

When plants drink check to see what’s going on with your ppm, it should be stable for about a week with just adding water when your topping off your solution. If your ppms keep dropping as plants drink it means you need to start with a higher ppm solution. You can take it up two weeks before a Rez change as long as your just topping up with fresh water and ppms are still in the right place. Usually your PH will tell you when to switch out your nutes. Ph will start swinging high or low and when adjusted doesn’t stay in range very long.
 
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