Five declining importance of bush fallowing in west africa
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not the exact answer, but hope it helps:
In a fallow system that includes intensive tillage, crop residue decomposition will occur faster due to incorporation of residue into the soil. A traditional fallow system is defined as leaving the land either uncropped and weed-free or with only volunteer vegetation during at least one period when a crop would traditionally be grown (SSSA, 1997). For the purpose of this discussion, fallow will only include residue from the previous crop with a weed-free period maintained with intensive tillage between crop sequences.
Faster decomposition of crop residue associated with intensive tillage results from complete exposure to the food web. Neher (1999) defined characteristics of a soil food web and that indicated it varies with geography and climate. However, Lachnicht et al. (2004) succinctly described the food web as the “decomposer community.” In addition to geography and climate, this community can also change based on the tillage system. Frey et al. (1999) reported fungi dominate the microbial community in no-tillage systems, while bacteria dominate the community in conventional tillage systems. Obviously, residue remains on the surface in no-tillage systems, while residue is incorporated with conventional tillage. Faster decomposition of buried residue for conventional tillage systems is often related to higher water content and greater densities of decomposer organisms when compared to surface residue in no-tillage systems (Beare et al., 1992). Effects of tillage systems on soil microbial communities are typically manifested during the fallow period (see discussion in Section 11.5.4).