Continuous Automated Measurements of Soil N2O and CO2 Emissions with the Portable Irga System in the Static Chamber Microplot Study.

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.