Fallow Syndrome is a well-documented phenomenon where crops that would typically benefit from association with mycorrhizal fungi suffer yield loss after a season of fallow (Wetterauer & Killorn 2013). This is due to the lack of living roots that would support the fungi and thus the fungi decline and go dormant. This means that the crop that trails fallow in the rotation will not have an adequate population of mycorrhizal fungi to associate with and to supply it with water or phosphorous. The result is a poor performance by that deprived crop.
