Thankfully dont have to deal with RKN here, but stumbled across this and thought it might help.
http://blog.gardenharvestsupply.com/...ll-cover-crop/
Rootknot Nematodes (Meloidogyne incognita), the parasitic culprit responsible for many vegetable deaths, especially the susceptible tomato, have proven to be sensitive to radish residues. Rootknot nematodes' numbers were found to be drastically reduced or completely obliterated. Researchers in eastern Texas planted radishes 58 days prior to planting sweet potatoes, with exceptional results. On the other hand, the beneficial nematodes, those which help to control disease and cycle nutrients to the plants (the ones we hardly hear anything about), were benefitted by the nitrogen-rich radish decomposition.
To learn even more, you can read GroundHog Radish – A Smart Choice Cover Crop. All in all, the combined positive effects should result in a higher crop yield with less work for you. Cash crop farmers have long known the benefits of cover cropping with radish; we think it's time you realize the same benefits.