Suduan Gao1, Aileen Hendratna1 and Claude Phene2, (1)SJVASC Water Management Research, USDA-ARS, Parlier, CA (2)SDI+, Clovis, CA
Agriculture is identified as a major contributor to greenhouse gas N2O emissions. Developing a sustainable crop production system should consider increasing N use efficiency and minimizing losses including N2Oemissions. Pomegranate is a new emerging crop in the San Joaquin Valley of California because of the health benefits of the fruits. In the process of developing a productive orchard, subsurface drip irrigation (SDI) is investigated for high efficient water and nutrient use in comparison with surface drip irrigation (DI). We hypothesize that SDI will reduce N2O emissions because of more efficient water use and plant N uptake based on previous tests for annual crops. The objective of this research is to determine if SDI is also efficient in reducing N2O emissions in perennial field. Static flux chambers with automatic sampling feature were constructed for field measurements. Data show significantly higher N2O emissions from DI than SDI plots. Higher N2O concentrations were determined in DI soil profile compared to SDI. The relationship between soil N status and N2O emissions are examined. This research is to provide an assessment on potentially environmental benefit of SDI in a newly established pomegranate orchard.