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Methodologies are required to verify agricultural greenhouse gasmitigation at scales relevant to farm management. Micrometeorologicaltechniques provide a viable approach for comparing fluxes betweenfields receiving mitigation treatments and control fields. However,they have rarely been applied to spatially verifying treatments aimedat mitigating nitrous oxide emission from intensively grazed pastoralsystems. We deployed a micrometeorological system to compareN2O flux among several ~1.5 ha plots inintensively grazed dairy pasture. The sample collection andmeasurement system is referred to as the Field-Scale Nitrous OxideMitigation Assessment System (FS-NOMAS) and used a tuneable diodelaser absorption spectrometer to measure N2O gradients tohigh precision at four locations along a 300 m transect. Theutility of the FS-NOMAS to assess mitigation efficacy depends largelyon its ability to resolve very small vertical N2Ogradients. The performance of the FS-NOMAS was assessed in thisrespect in laboratory and field-based studies. The FS-NOMAS couldreliably resolve gradients of 0.039 ppb between a height of0.5 and 1.0 m. The gradient resolution achievedcorresponded to the ability to detect an inter-plot N2O fluxdifference of 26 μg N2O–N m−2 h−1 under the mostcommonly encountered conditions of atmospheric mixing (quantified hereby a turbulent transfer coefficient), but this ranged from 11 to59 μg N2O–N m−2 h−1 as the transfer coefficientranged between its 5th and 95th percentile. Assuming a likely value of100 μg N2O–N m−2 h−1 for post-grazingN2O fluxes from intensively grazed New Zealand dairypasture, the system described here would be capable of detectinga mitigation efficacy of 26% for a single (40 min)comparison. We demonstrate that the system has considerably greatersensitivity to treatment effects by measuring cumulative fluxes overextended periods

The detectability of nitrous oxide mitigation efficacy in intensively grazed pastures using a multiple-plot micrometeorological technique