Every year we have been trying to raise tomato's, and they start out great, then right before the tomato's start to ripen, the leaves on the bottom of the plants turn yellow and die. We have tried different varieties, and rotate our crops, every year, but keep having the same problem. This year we put cow manure and lime on the garden, before we tilled it. I water them every morning, and miracle grow, once every one to two weeks. I took a picture of the leaves. Has anyone ever had this problem, and if so, how can I stop it from happening? Thanks.