i was wondering the same thing, i was going to add Lugol's to the water i use, but what happens to the veg i grow out of season, that doesn't need watering?
d
xx

I don't know what you mean by kelp water
I go down the beach and get a car load of seaweed when I can, but an alternative is to get a liquid seaweed extract(with no chemicals of course) such as SM3 in the UK and spray the plants with it, that can correct a lot of potential deficiencies besides iodine, or just add it to a watering can, but that's more wasteful. Unless your adding piles of seaweed or spraying the leaves I don't think it's going to add much Iodine to the plants
and adding Iodine to the soil seems wasteful. Likely most will just wash out depending on your soil and amount of rainfall. Maybe potassium Iodide could be sprayed on the leaves without burning but not lugols.
It seems better just to take it yourself

I can't find the article right now, but I do remember reading (somewhere) where growing sunflowers every year (for three full years) will totally cleanse the soil to prepare for organic gardening, as the sunflowers will actually absorb toxins. Of course, you want to garden now; so, perhaps we should all think about another plot of ground to detoxify while growing our food wherever we all grow it presently.

As far as Iodine is concerned, I know that two summers ago my hubby put out pvc pipe (yeah, I know, 8^( - PLASTIC - should be a better option out there) - but anyway, he hammered pvc piping into the ground so that I could pour iodinated treated water right to the roots of tomatoes we grew. Those tomatoes were pretty darn good, come to think of it. (we didn't garden last summer for the back problems we both had)