I have a stupid question,but does any anyone out there know why the lower leaves on my tomato plants changeing to the yellow color?
Probably just normal, especially for container plants. I have lots of yellow leaves on the tomatoes that I have for sale, I can't keep them watered enough in this heat, So they get a little stressed and shed some of their leave to compensate, so they don't need as much water throughout the day. If you have room in the container, now is a great time to add more potting mix. Put some of those soil moist crystals in with the mix, if you can, so you have more moisture holding capacity in the potting mix. they absorb about 500x their weight in water.
In the heat its pretty normal for the lower leaves to yellow. Its the plants way to rid itself of leaves it doesn`t really need thus conserving water to produce fruit !!
Clorosis (yellowing leaves) can be caused by over or under watering. This can become acute with container grown plants. If your plants are in containers and the soil is damp or mucky, you may be watering too much. If your soil (in containers) has a lot of peat or loess soil it could also be not outgassing well. Huh? The soil is not admitting enough air. The fix for poor airation of soil is bigger particle size. It may be too late for this year. Most tomato growers who grow in containers are adding 1/3 each of crushed bark mulch and coarse sand. I suspect this may be for next years grow...
