What is wrong with my tomato plants?

Question

i have 8 tomato plants. 5 of them are flourishing. 3 of them are getting yellow leaves at the bottom. the plants are in a row and at one end there is a cement wall that i think makes that end of the row stay wetter and more shady. do you think those 3 plants could just be staying too wet? and what would be the solution?

Answer 1

check the PH of your soil, and make sure its around 6-7. use PHUP and PHDOWN from your local hydro store in small amounts as needed

Answer 2

Sounds like your problem.  If you can't moce them try diging a small trench away from the plants.