Kirill Kostyanovsky, Crop and Soils and Biological Systems Engineering Depts., Washington State University, Pullman, WA, David Huggins, Land Management and Water Conservation Research Unit, USDA-ARS, Pullman, WA, Claudio Stockle, Washington State University, Pullman, WA, Jeffrey L. Smith, Land Management and Water Conservation Research Unit., USDA-ARS, Pullman, WA, David Brown, 201 Johnson Hall, Washington State University, Pullman, WA and William Pan, Crop and Soil Sciences, Washington State University, Pullman, WA
An accurate assessment of diurnal, event-driven, and seasonal dynamics in soil greenhouse gas emissions is required for predicting the effects of agricultural management practices on global climate change. We implemented a combination of the Li-Cor 8100A and Teledyne T320 infrared gas analyzer (IRGA) portable system to measure the CO2 and N2O fluxes from soil in the microplot experiment with contrasting N application rates in the wheat site. The Teledyne T320 N2O analyzer was placed in line with the Li-Cor 8100A gas analyzer and Li-Cor 8150A Multiplexer via the Bev-A-Line tubing connection. The chamber sensor interface was utilized for the concurrent N2O data collection by Li-Cor software through the analog data cable. Due to differences in the flow rate of the Teledyne T320 (0.8 L min-1) and the air flow output by Li-Cor 8100A (1.7 L min-1) a bypass tubing was added to divert excess flow into the incubation chamber. The Teledyne T320 N2O readings were adjusted for the changes in air humidity over each incubation period per Li-Cor measurement protocols. The sensitivity of the Teledyne T320 at various chamber incubation periods (8-20 min) is being evaluated.