Growing nitrogen in the organic orchard

CSANR Project 046

Status: Complete

Annual Entries

2008

Principal Investigator: Joan Davenport
Additional Investigator: David Granatstein
Progress Report: http://csanr.wsu.edu/wp-content/uploads/2008/06/ProgReport-Granatstein-N-08.pdf
Grant Amount: $13,698

2009

Principal Investigator: Joan Davenport
Additional Investigator: David Granatstein
Progress Report: http://csanr.wsu.edu/wp-content/uploads/2008/06/Davenport_FY09_progress_OrchardN.pdf
Grant Amount: $13,013

2010

Principal Investigator: Joan Davenport
Additional Investigator: David Granatstein
Progress Report: http://www.tfrec.wsu.edu/pdfs/P1847.pdf
Grant Amount: $15,874

Publications

Mullinx, K. and Granatstein, D. 2011. Potential nitrogen contributions from legumes in Pacific Northwest apple orchards. Intl. J. Fruit Sci. 11:74-87.

Granatstein, D.*, Wiman, M., Kirby, E., Mullinix, K. 2010. Sustainability trade-offs in organic orchard floor management. Acta Hort. 873:115-122.

Samples are still being analyzed for Year 3 and manuscripts will be prepared once all data are analyzed.

Additional Funds Leveraged

None - proposals were not funded.

Impacts and Outcomes

In 2010, the cooperating grower in one on-farm trial expanded the practice we are testing to an additional 80 acres. I personally viewed the fields. A neighboring farm adopted the practice on 20 ac that I personally viewed. The cooperating grower on the other project applied the practices on over 100 acre of orchard. This grower also qualified for $80,000 in EQIP funds for the practices. In a recent grower survey (n=74), 51% of the growers reported use of legume cover crops to supply nitrogen in their orchards, which is the focus of one of the research projects. NRCS is now cost sharing this practice and a training for NRCS staff is scheduled for May 2011.