M. Ramlow, E.J. Foster, S.J. Del Grosso, M.F. Cotrufo, 2019
This study evaluated a maize field in northern Colorado under deficit irrigation treatments with a woody biochar amendment. They measured crop biomass, grain yield, grain nitrogen uptake, mineral nitrogen availability, soil water content, soil field capacity, soil carbon sequestration and N2O emissions. Both biochar amendments and limited irrigation treatments did not significantly impact yield-scaled cumulative N2O emissions or irrigation water-use efficiency. Among other findings, this study confirms the diminished biochar N2O emission reductions in the field relative to most lab incubations due to drier field conditions and crop nitrogen uptake.
An eosAC deployed along with static chambers to capture temporal variability.
Six eosAC autochambers, an eosMX multiplexer and a Picarro G2508 analyzer gathered data for a 5 month period with high temporal resolution. The measurement lengths were 30 minutes with 5 minutes in between. These were used in combination with 24 static chambers to capture spatial variability. The automated chamber system fluxes were used for quality control of the weekly static chamber measurements ensuring that those measurements were representative of fluxes over the full day, and that they caught the primary N2O peaks throughout the field season.
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