Yellow Leaves On Some Plants

Question

We have an approximate 6′ x 6′ x 12 inch area with, I think, 6 plants total (pepper and tomato plants). They have only been planted for two weeks. The tomato plant in the back left has yellow leaves on the bottom, and the pepper plants in the middle of the planter box seem to have dry and yellow leaves. What could this mean?

Answer 1

These articles should help: https://www.gardeningknowhow.com/edible/vegetables/tomato/yellow-tomato-leaves.htm
https://www.gardeningknowhow.com/edible/vegetables/pepper/pepper-yellow-leaves.htm