Problem, Lower leaves!

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Hey,


My girls are on day 30, they have already entered flowering stage.
I use Biobizz AllMix, under 600w hps, with a minimum dose of 1ml/L BioGrow lately. The run-off water has 6.5 PH level

Overall they look healthy enough. yet on the lower part, leaves have these colored spots...

BAD1.jpgBAD2.jpgCKII.jpg

Is it Mg deficiency?
If yes I already have Epsom Salt (Magnesium Sulfate), what's the recommended dose?
 
It looks like a Mg def. i can not advise you on how much to use tho, i give epsom salt in my reservoir everytime i replace some of the nutrient solution.
But thats dwc and not soil.
 
we have almost the same setup i use 1tbs/1l at every feeding :Sharing One:

btw for me it looks like waterdrops from watering but you should use your epsoms you see cal/mag def first at yellowing veins
 
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No, it's not a mag deficiency. If it were you would see the spaces between the leaf veins turning a more uniform lighter green color with no necrosis in the early stages. That looks more like the start of a phosphorus deficiency. All Mix is considered a "hot" mix since it contains high levels of nutrients, often too hot for autos. At day 30 those nutrients are probably exhausted, so serious supplemental feeding is likely needed. They have not entered the full flowering stage yet, but are in pre flower. Full flowering doesn't start until vertical growth stops, usually around day 35 - 42. Since they are close to that point I would suggest giving them a half strength feeding of equal parts of veg and bloom nutrients, switching over to bloom nutes only once vertical growth stops.
 
Thanks again Muds, I was on my way to givem Mg supplement.
I know now that AllMix was seriously hot for my girls.
In my journal I'm trying to stick to your instructions not to feed bloom until vertical growth stop.
I will start you recommended feed right away.

One last question... Should I apply feed every time I water or every other watering?
 
Personally, I prefer giving nutes with every feeding. I'm running LEDs, and even with added perlite it takes awhile for the pots to dry out. If I only feed every other time my plants wouldn't be getting enough nutes.
 
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