Rotating crops in small raised beds?
I have three 4x8 raised beds that I've been growing heirloom tomatoes in for 4 consecutive years. I supplement the soil with liberal amounts of compost from my compost bin each year. I have never rotated crops because I don't have anywhere else to move the tomatoes to. So far, my 3 raised beds have produced with extraordinary abundance, and with few problems. But last year, I had an exeptionally high amount of blossom end rot. I'm thinking that the soil has had the calcium depleted, so I've amended the soil with gypsum. The PH is fine. BUT, I'm still concerned because lots of people are telling me my problem is that I need to rotate my crops. So I don't know what to do. I don't have anywhere else I can move or rotate them to, but I don't want to give up my tomato beds. Any advise or suggestions would be profoundly appreciated!