2011 Annual Report
1)`Best management practices' to increase nitrogen retention and balance production and weed control,.
2)Calculation of C offsets potentially gained by reductions in nitrous oxide emissions and increases in soil C content,.
3)A decision support system using a web-based GIS to enhance on-farm soil C stocks,.
4)grower-friendly publication by partnering with National Center for Appropriate Technology. Significant progress has been made during FY2011. Intensive grower interviews to determine management practices across nearly 100 vineyards in Napa and Lodi have been conducted. A third of these sites have been sampled for soil characteristics to 1m depth, and soil samples are currently being processed. The remaining sites will be visited in Fall 2011. Cooperation between scientists at Applied Geosolutions, LLC has proceeded, and the interactive website where growers can evaluate impacts of their management practices and landscape attributes influence GHG emissions has been initiated. Further, we are cooperating with the California Sustainable Winegrowing Alliance (CSWA) to coordinate our efforts on the website and the life cycle analysis of grower practices as they impact both GHG emissions but other environmental factors like water quality. Equipment necessary for measuring GHG emissions was built and installed across numerous vineyards to capture the effect of management and soil landscape attributes on soil nitrogen cycling. These findings will also be contributed to the project managed by CSWA, in which the DeNitrification/DeComposition model is being refined for use in California winegrapes. The grower-friendly publication is underway, and partners at UC Davis, USDA/ARS and NCAT are developing the specific goals and content for the publication.