Is this a magnesium deficiency?

om3gawave

Active Member
Hello fellow RIUers. Here I have four lovely AK-47 from Nirvana. They are in their 25th day of life and still vegging. I transplanted them last night from one gallon pots into three gallon pots. My soil mix is 50% FFHF and 50% FFOF. I also added 1 tbps of dolomite lime per gallon of soil, as well as about 20% extra perlite. My temperatures are steady between 70F and 75F. The pH of my water is around 6.5. I have not fed these plants any nutrients since they were planted.

Do you folks think this is a magnesium deficiency? The tops of the plants and branches (new growth) seem to be growing in yellowish, but I still see these "rust spots" on the leaves, making me think of a magnesium deficiency. I should also note that a couple of the leaf tips seem to be getting brownish/purple and brittle.

Any guidance appreciated, thanks folks!
 

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they are under fed start feeding! they look slightly over watered but this cld be from the recent transpsnt
 
Will do...I will wait for the soil to dry up a bit and will begin feeding. Today they will be 26 days old, should I keep it at about 1/4 or 1/2 strength, does it matter? I am using Alaskan fish fertilizer for veg and Morbloom for flower.
 
I started feeding mine at 2 weeks with 1/4 strength, they responded beautifully.

Since you've waited so long, I would say go ahead and go 1/2 and see how they respond. Might want to keep it at 1/2 next time, too.
 
Just an update to this thread.

It turns out the pH is real out of whack. I top dressed with 2 tbsp of dolomite lime for each of my 3 gallon pots (not enough, I know). And watered with some pH balanced water (pH down/sulfuric acid).

Two of them were male. One of the remaining females looks better than the other. I am hoping not all is lost. I will add 4 tbsp of dolomite lime next time I water to each plant.
 
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