Please help me figure out whats wrong with my tomatoes

[tammy]

Out of about 80 tomatoes, I have had about 6-8 that started to yellow to a gray green, and wilt. The leaves wilt and curl, then start browning and turning crinkly. Until eventual death of the plant. They are just now starting to bloom so I dont have fruits to look at. Some pictures seem to suggest potassium defiency and sometimes calcium. I am just not sure. There should be plenty of nitrogen because I ammended with a large amount of aged manure when building the raised beds. I am fertilizing according to Middleider, and have added a few doses of calcium nitrate about every 10 days or so. The rest f the tomatoes are blooming, nd bright green and look very healthy. I pulled and replaced some, but I have noticed the same symtoms starting in a few others.
Tammy