Most of the total soil nitrogen pool was immobilized in the microbial biomass in all
treatments (Figure 3b). The percentage of N immobilized by microbes tended to be highest in
plots mulched with recycled pallets, although the differences were not great (Figure 3b).
However, the total pool of nitrogen was much lower in the wood pallet than in the composted
yard waste treatment. Microbial immobilization of such a high proportion of a limited pool of
nitrogen would leave little for plants. In the yard waste treatment, on the other hand,
immobilization of a smaller proportion of a much larger nitrogen pool should result in much
higher levels of available nitrogen. Indeed, the rate at which nitrogen was released from
decomposing organic matter (nitrogen mineralization rate) was much higher in plots mulched
with composted yard waste than in the wood pallet treatment (Figure 3c). This greatly increased
nitrogen in forms available to plants (dissolved organic N, ammonium, and nitrate) (Figure 3d).
Most of the total soil nitrogen pool was immobilized in the microbial biomass in alltreatments (Figure 3b). The percentage of N immobilized by microbes tended to be highest inplots mulched with recycled pallets, although the differences were not great (Figure 3b).However, the total pool of nitrogen was much lower in the wood pallet than in the compostedyard waste treatment. Microbial immobilization of such a high proportion of a limited pool ofnitrogen would leave little for plants. In the yard waste treatment, on the other hand,immobilization of a smaller proportion of a much larger nitrogen pool should result in muchhigher levels of available nitrogen. Indeed, the rate at which nitrogen was released fromdecomposing organic matter (nitrogen mineralization rate) was much higher in plots mulchedwith composted yard waste than in the wood pallet treatment (Figure 3c). This greatly increasednitrogen in forms available to plants (dissolved organic N, ammonium, and nitrate) (Figure 3d).
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