Not much fertilizer was used on these Celebrities. They are resistant to verticillium wilt, fusarium, and nematodes (VFN). That's the reason they were planted in this bed with signs of Root Knot Nematodes. Joining these tomatoes in their fight for a nematode free world is basil, asparagus, and French Marigolds. There are a few vines that don't look so great though. They may be in an area where the nematodes are the worst. Those will be pulled and replaced with more French Marigolds.
Susy at Chiot's Run posts information about growing yellow mustard to fight against nematodes. I may consider planting yellow mustard in the fall to grow through the winter. Peas were intended for this bed during the cool season. I wasn't sure if mustard would grow with peas but the Canadians ran a test and the results indicate that mustard is a good companion. I'm looking into this combination to improve the soil and produce a good crop of peas.