Do a google search for perennial peanut - see if it fits your need.

Had Crotolaria juncea L. as a cover crop last year to fight rkn. This year I'll just have Calalloo again, Amaranthus dubius.

Field peas and sunflowers - Crackerjack marigolds for root knot nematodes. Actually, I think field peas are also effective with nematodes.

Millet works. It's a grass and it likes the nitrogen. Just buy a cheap bag of bird seed (the main ingredients will be milo and millet, with a few sunflower seeds) and sow it thickly. The sunn hemp and field peas mentioned above are good, but they're also legumes and so probably aren't the best choices for excessive nitrogen. How do you get too much nitrogen in Florida? My problem is always the opposite.

Bill

Thanks for the ideas. I never said I have too much nitrogen. I just have too much to grow sweet potatoes this summer. They like low nitrogen. I have ample nitrogen due to my composting. One of the ingredients is horse manure. And my compost is extremely loaded with earth worms. (red wiglers).