The Society for Conservation Biology has a catalogue of social sciences tools for conservation here. There are 270 items listed in the catalog, which you can search in various different ways. Quick searches for such keywords as “agriculture” and “crop” only generated a couple of hits, but I think most of the tools included (things like gender analysis and participatory rural assessment) will be particularly relevant to the conservation of agricultural biodiversity. There’s a more biologically-inclined catalog of tools here.