Why are the leaves of tomato plants turning yellow?

I planted 8 goliath hybrid tomato plants in my backyard.Mine is a clayey soil...I mixed compost and fertiliser before planting and I am watering the plants regularly but my plants look dull and leaves are turning yellow. But they still have new green leaves and are budding. I water everday...am i overwatering? They are getting enough sunlight and I planted 80% of the plant as per the instructions and I am adding natural compost (chopped up veggies) to it often...what might be the problem? please help!!

Why are the leaves of tomato plants turning yellow?
You can remove the lower leaves from your plants. I hope you allowed your compost to rot down well before using it on your plants. Your watering is o.k. but try not to get the water on the leaves. Once fruit starts to set you need to feed with a tomato fertilizer. Tomato plants usually make a lot of leaves which you can remove as the plants grow, but only below the flowers and fruit. This will help the fruits to ripen. Good Luck hope you get lots of tasty toms.
Reply:If just the lower leaves are yellowing, they may just be getting shaded out. That's ok. If the whole plant, you prbably have a virus, fungus or wilt problem (overwatering may have facilitated this) - maybe even nematodes (worms). Older tomato plants are susceptible to a lot of problems.
Reply:may be there are some kind of heat around , tin sheet or cooking chimney

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