stumped on this one...

I've noticed some slight yellowing/dark spots happening to quite a few of the leaves on one of my plants. I've looked through nutrient disorders and cannot pinpoint what it could be. Otherwise she looks really healthy...i'd rather catch the prob earlier than later. None of the leaves have fallen off, however most are showing a slight yellowing throughout the entire leaf and there are small very pronounced rust colored spots on a few of the leaves. She's a herijuana/thunderfuck f1 cross that I got through a friend that breeds. Was the last seed so i'd like to keep her as healthy as possible for cloning. Iv'e fed her once so far with a chelated 20/20/20 fert w/micronutes @1/4 strength. No leaf tips burnt or any leave curling happening so I figure it's slightly lacking something. I have her potted in a mixture of peat/perlite/vermiculite/charcoal/bloodmeal so there's little to nothing for nutes in the soil other then nitrogen. Soil PH is 6.8, I always water her @ 6.8 as well. I'd say she's 2-3 days away from the next watering. Here's some pics:

1.this was the worst looking leaf



2.shows yellowing that is happening


3. whole plant




any help would be awesomesauce, cheers!

Boneman said:

I keep saying that Cal Mag is an essential part of the plants diet. If you look at a ph chart and which nutrients are taken in at the different ph levels, you will see that Ca and Mg have a very small window and at 6.8 your plants are not getting those two elements.

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really? I was told that 6.8 is the only number that all nutes can be absorbed at. any idea where I can find a ph chart? I'll be using holland secret 3 part formula for her next feeding so i'd like to figure out what PH I should be at. Thanks.

I've always heard that 6.2 is ideal--slightly acidic.

Boneman said:

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freakin awesome! Thanks for the chart Boneman...looks like 6.5 would be the number to use if i'm feeding with complete nutes. Kudos!