Yellow leaves on my Tomato plants

[sall2009]

I have 3 Tomato plants in pots in the garden. Positioned to get full sun most of the day. The bottom leaves of all of them are getting yellow. (2 are worse than the third) I have a forth plant that was the same size and has always been on a window sill which gets sun light in the afternoon only. This plant seems to be growing bigger than the outside plants and it hasn't got any yellow leaves at all. Can anyone think of reason, why the leaves are turning yellow?

[taff]

have a look at the other thread with the same title. there's your answer

[mrscorpio]

I may be wrong but the plant in the second photo on the right ---- the top left branch needs pinching out.

you can plant this in a seperate pot and grow a new plant. There was a thread last year about growing armpitted tomatoes.