Hi, i have several tomato plants that are all browning from the bottom leafs up. They were looking good, full and very green until about 2-3 weeks ago. There are some yellowing and spots on the leafs between the brown dried ones and the top green leafs that i haven't been able to identify myself. The plants have all set several tomatos and those do not look like they have any issues. The plants are close together, but i planted them the same way last year due to spacing issues and did not have these problems at all last year. I just got the dirt last spring so this is the second season of planting tomatos in this same soil, not sure if that has depleted the nutrients or if it's another issue. I did add 4 bags of manure to this 16'x4' bed, nothing else. I started all the plants from seed in Happy Frog soil and they looked exceptional when i planted them and for the following several weeks and now im not sure what to do as whatever this is seems to quickly be taking them over. Thank you so much for any advice you are able to offer!