Accelerating the development of biological nitrification inhibition as a viable nitrous oxide mitigation strategy in grazed livestock systems
2022
De Klein, C. A. M. (Cecile A. M.) | Bowatte, Saman | Simon, Priscila L. | Arango, Jacobo | Cardenas, Laura M. | Chadwick, David R. | Pijlman, Jeroen | Rees, R. M. (Robert M.) | Richards, Karl G. | Subbarao, Guntur V. | Whitehead, David
This position paper summarizes the current understanding of biological nitrification inhibition (BNI) to identify research needs for accelerating the development of BNI as a N₂O mitigation strategy for grazed livestock systems. We propose that the initial research focus should be on the systematic screening of agronomically desirable plants for their BNI potency and N₂O reduction potential. This requires the development of in situ screening methods that can be combined with reliable N₂O emission measurements and microbial and metabolomic analyses to confirm the selective inhibition of nitrification. As BNI-induced reductions in N₂O emissions can occur by directly inhibiting nitrification, or via indirect effects on other N transformations, it is also important to measure gross N transformation rates to disentangle these direct and indirect effects. However, an equally important challenge will be to discern the apparent influence of soil N fertility status on the release of BNIs, particularly for more intensively managed grazing systems.
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