Here is my reasoning for not using a WC in a rotation plot that is to be replanted the following summer/fall. WC unlike some others like reds, does not establish quickly. It will provide feed but does not have much a chance to establish the nodules sufficently in a short period of time that produce N. So that affect is minimal. Its more shallow root structure doesn't mine many minerals from the soil in that short window either. So with that said, I would spend my money and time on plants suchas reds, brassicas, grains, etc that perform well in a short time frame. Now for perennials or a plot that issn't to be rotated for couple years, then whites have a different conversation. Just my opinion based on esperience.