Summary

and a table grape vineyard (Delano), both with very different irrigation, N fertilizer regimes and other management practices that affect temporal and spatial scales of soil gas emissions (e.g., girdling of vines, Delano). A highlight of this effort was the recruitment of the Nickel’s Soil Laboratory, Farm Advisor Jennifer Hashim (Kern County) and Farm Advisor John Engstrom (Colusa County), to insure the assessment of greenhouse gas emissions on a diurnal, seasonal, and inter-annual time scale will have the requisite human resources to insure success. • We acquired more than six months of data in compiling an annual budget for nitrous oxide (N2O), methane (CH4) and carbon dioxide (CO2) emissions in both the vineyard and almond orchard to compliment previous work within a wine grape vineyard and natural oak grassland in Napa for large-scale regional comparisons. • Preliminary experiments indicated that spatial heterogeneity of N fertilization and irrigation (fertigation) on the extent of N2O (and CO2) fluxes in both the almond orchard and the table grape vineyard were massive, but that spatial constraints may be limited by cultural practices like surface versus subterranean drip