Localized Chlorosis in bed?

[1vh1]

Most of my raised bed looks great, but one spot is getting yellowing veins that is progressing into yellowing leaves. At first I thought this was an iron defecency, but now I'm not sure since the veins are also yellow. Here is a picture.
 

 
How should I tackle this?

 

[Edmick]

I'm gonna go out on a limb here (and this is just a guess) but the fact that it's right up against the house COULD mean you're leaching lime from the foundation into the soil. Chelated iron can help counteract that.

EDIT: I had the same issue with a few plants and I did a foliar feed of cal-mag plus (which is calcium, magnesium and iron) and it fixed the problem.

 

[CMJ]

I was thinking the same thing. Looks like a mag issue to me, but I would check the ph and get that right before I started adding anything.

I'm gonna go out on a limb here (and this is just a guess) but the fact that it's right up against the house COULD mean you're leaching lime from the foundation into the soil. Chelated iron can help counteract that.

EDIT: I had the same issue with a few plants and I did a foliar feed of cal-mag plus (which is calcium, magnesium and iron) and it fixed the problem.