Denitrification and nitrate ammonification are considered the highest-energy-yielding respiration systems in anoxic environments after oxygen has been consumed. The corresponding free energy changes are 7 and 35% lower than that of aerobic respiration, respectively. Growth yield determinations with pure cultures of Paracoccus denitrificans and Pseudomonas stutzeri revealed that far less energy ...

Most of the work which has been done on trace elements in soils has been in relation to deficiency or toxicity effects on plants. Although a certain amount of work has been reported on the effects of trace elements on ammonification and nitrification in soils 12 a 4 5 6 the results obtained are conflicting. Trace elements may be introduced into soil where pesticide sprays e.g. copper fungicides...

We investigated the effect of mulch on N cycling in a hardwood plantation of subtropical Australia by examining monthly in situ net N mineralization for 12 months and natural N abundance (δN) of soil and plants. Monthly net N mineralization ranged from –23.0 μg g soil (net immobilization) to 52.6 μg g soil across 12 sampling months and across both mulch and nonmulch treatments. There was a sign...