Yellowing Tips

Thank you in advance for any help...

INFO:
FFOF soil
Plants 4 weeks old.
Transfered last week from 1L to 3gal pots.
No nutrients given thus far.
(see my grow journal for more info...)

Noticed yellowing this morning on leaf tips. Any ideas to what it could be?

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As the day progressed, the yellowing has become more prominent.

Is this a burn or deficiency -- or something else? The yellowing seems to be occurring on the upper leaves tips rather than the lower ones...

I have not watered my plants in over a week (and have not added any nutrients as of yet). Tomorrow I am going to add SPT when I water...

Your soil is hot is my guess. Try flushing to leech some of the slow release nitrogen from the soil. Is this showing up just on the new or old growth? I wouldn't add anything yet except maybe Superthrive to reduce transplant shock.

This is occurring on new growth

It looks like nutrient burn, so as someone else said it is probably that you have some 'hot spots' in your soil that have an overabundance of nutrients. I would recommend flushing the system with plain water pH'ed to about 6.5 when you do water. You mentioned that you hadn't watered your plants in over a week. Why so infrequently? Do you have really big containers? You should be watering your plants after the top inch or so of soil gets dried out.

growweedtoday:

3gal containers...

I was overwatering before and it damaged my plants. My plan is to water once a week from here on out. I'll be watering tomorrow. That's 8 days w/o water.