Movement of N upward seems to require an organism that gets its N in the soil, takes it upward into the mulch,I was imagining a wet soil, with the soil solution nearing field capacity, and N migrating upwards through diffusion, as carbon chewing bacteria grab everything mobile out of the soil solution. Kind of a longshot though... I expect that under most conditions chaos would get the upper hand. Maybe if you mulched spinish seedlings with woody stuff in spring and N hadn't been tended to by other means.
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