time in the sun

I'm also growing in direct sunlight in Cali and for the first time ever all my plants are turning slightly lime yellowish....they are planted in black pots and I noticed when transplanting that the roots get very hot in the 8-10 hours of sunlight a day. Is it bad if the rootball of the plant gets as hot as outside temps, say in the 90's? My plants don't look as happy as they did two years ago when I grew outside. I haven't changed the soil; mix much except went to bagged topsoil for drainage and 1/3 peat moss. Could it be N deficiency...I'll post pics tomorrow.

Raising "Outdoor" in pot's is really tricky! Sounds as if their "cycle" has been disturbed; i.e in Nature we find "X" amount of Light, "X" amount of Dark;
let's substitute 12 for X,eh? O.K.; Assuming "everything" you do is perfect, you still have very different conditions than;
1. Plants in well prepared 'soil".
2. Plants in well prepared soil,in adequate containers, grown in a Grow-tent, with highly regulated; breeze/ CO2/ Warmth/ Light Spectrum's
3. You've got many more variables doing what you're doing.
Would truly suggest spending some time "watching" other's grow on YouTube - Broadcast Yourself.. Many; generous donations of techniques/ knowledge there.

nugs you really want to keep the temps in the mid 70's to very low 80's 73-76 would be perfect.how old are the plants? it could be just water leaves turning and depending on how many this could be normal, if its all of them I would say nutes, hopes this helps