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Washington State University - Puyallup Organic Farming Systems and Nutrient Management

Organic Farming Projects

WSU Puyallup has 12 acres of certified organic farming research land and several more acres of non certified land that has been managed organically. Current and recent experiments include the Organic Farming Systems experiment, cover crop trials, climate change gas experiments, food safety, and improving no and low tillage methods.

Research areas:

♣ Organic Farming Systems for vegetable crop production – In 2002 we began the Organic Farming Systems experiment, an integrated research program focused on sustainable and organic production systems for small-scale, direct-market vegetable crop production. Our goal is to work with farmers to develop management systems that utilize local inputs to produce high-quality, high-value crops efficiently and profitably in an environmentally sustainable manner.

♣ Using local sources of organic nutrients – Using locally available organic materials (manures, yard wastes, etc) reduces nutrient imbalances and improves soil productivity.  Information on managing such materials including nutrient availability, equipment compatibility, potential side effects, economics.

♣ Cover crops We have been working with winter and summer cover crops to find varieties most effective at reducing weeds in later crops. Cover crops reduce erosion, improve soil structure, and provide organic matter and nitrogen to the soil.

♣ Soil quality –  We measured soil physical and biological properties in a variety of crop and management organic farming systems to see how they affected the soil quality over time.

♣ Pastured Poultry – We raised poultry in our Organic Farming Systems plots.  They provided nutrients to the soil for the vegetables grown during the cash crop part of the pasture/crop rotation, as well as income during the pasture part of the rotation.

♣ Farmer Focus Groups: Soil Fertility and Water Quality

Slideshows, Photos, and Webinars:

Photo Gallery from certified organic research land (HTML-Online)

Soils and Fertilizer (72 slides, PDF-Online, use browser down scrollbar to advance slides).  Soil physical properties, fertilizers, soil amendments, cover crops.

Introduction to Summer Cover Crops (16 slides, PDF-Online, use browser down scrollbar to advance slides)

Closing the Recycling Loop Through Organic Amendments in Agriculture and Gardens (Webinar-Online, Original broadcast date 5 Jan 2011. Slow loading, please wait till after “check our troubleshooting…” goes away.  Needs Flash Player to run which is not available on Apple products.)

Current Project Support:

♣ Western Region SARE

Past Project Support:

♣ USDA Integrated Organic Program CSREES

♣ WSU Center for Sustaining Agriculture and Natural Resource Organic Program

♣ Western Region SARE Grant No. GW06-011

♣ USDA IFAFS Grant No. 2001-52101-11349

♣ Western Region SARE Grant No. SW03-040



♣ WSU Center for Sustaining Agriculture and Natural Resources, information, publications, links, events, programs.

♣ Cultivating Success, sustainable small farm information for Washington and Idaho.

♣ Food Systems (integrates former Small Farms), information, calendar, resources, programs.

♣ Oregon State University Cover Crops Bulletins,  A series of bulletins that describes the uses and management cover crops grown in the Pacific Northwest

♣ Managing Cover Crops Profitably, 3rd ed., Published by USDA Sustainable Agriculture Network. This publication summarizes research data and farmer evaluations of cover crops grown across the United States.

♣ University of California Sustainable Agriculture Research and Education Program Cover Crop Resource Page

♣ Nutrient Management Guide: Sweet Corn. (pdf) For both conventional and organic growers.

♣ Nutrient Management Guide: Silage Corn (pdf)


Soil physical properties, nitrogen, and crop yield in organic vegetable production systems (PDF-Online). Cogger. C.G., A.I. Bary, E.A. Myhre, A. Fortuna, and D.P. Collins. 2016.  Agron. J. 108:1142-1154. doi:12.2134agronj2015.0335

Potential carbon sequestration and nitrogen cycling in long-term organic management systems (PDF-Online). Bhowmik, A. Fortuna, L.J. Cihacek, A.I. Bary, P.M Carr, and C.G. Cogger. 2016.  Renewable Agric Food Sys. doi:10.1017/S1742170516000429

Use of biological indicators of soil health to estimate reactive nitrogen dynamics in long-term organic vegetable and pasture systems (PDF-Online). Bhowmik, A. Fortuna, L.J. Cihacek, A.I. Bary, and C.G. Cogger. 2016.  Soil Biol. Biochem. 103:308-319.

Influence of seeding ratio, planting date, and termination date on rye-hairy vetch cover crop mixture performance under organic management (PDF-Online). Lawson A., C. Cogger, A.Bary, A. Fortuna. 2015. PLoS ONE 10(6): e0129597. doi:10.1371/journal.pone.0129597

Cover crop effects on light, nitrogen, and weeds in organic reduced tillage (PDF-Online) Wayman, S., C.G Cogger., C. Benedict, D.P. Collins, I Burke, and A.I Bary. 2015. Agroecology and Sustainable Food Systems, 39:647-665. doi: 10.1080/21683565.2015.1018398

The influence of cover crop variety, termination timing, and termination method on mulch, weed cover, and soil nitrate in reduce-tillage organic systems (Request pdf e-copy). Wayman, S. C. Cogger, C. Benedict, I. Burke, D. Collins, and A. Bary. 2014. Renewable Agric Food Sys. doi:10.1017/S1742170514000246

Soil fertility in organic systems – A guide for gardeners and small acreage farmers (Request pdf e-copy). Collins, D. C. Miles, C. Cogger, and R. Koenig. 2013. Pacific Northwest Extension Publication PNW 646.

Nitrogen contribution of rye-hairy vetch cover crop mixtures to organically grown sweet corn (Request pdf e-copy). Lawson, A., A. M. Fortuna, C.G. Cogger, A.I. Bary, and T. Stubbs. 2012. Renew. Ag. Food Sys. 28:59-69. Available on CJO doi:10.1017/S1742170512000014.

Farm-scale variation of soil quality indices and association with edaphic properties (Request pdf e-copy). Collins, D.P., C.G. Cogger, A.C. Kennedy, T. Forge, H.P. Collins, A.I. Bary, and R. Rossi. 2011. Soil Sci. Soc. Am. J. 75:580-590.

Management effects on soil quality in organic vegetable systems in western Washington (Request pdf e-copy). Pritchett, K., A.C. Kennedy, and C.G. Cogger. 2011. Soil Sci. Soc. Am. J. 75:605-615.

Estimating plant-available nitrogen release from manures, composts, and specialty products (Request pdf e-copy). Gale, E.S., D.M. Sullivan, C.G. Cogger, A.I. Bary, D.D. Hemphill, and E.A. Myhre. 2006. J. Environ. Qual. 35:2321-2332.

Fertilizing with manure and other organic amendments (PDF-Online). Bary, A., C. Cogger, and D.M. Sullivan.  2016.  PNW0533.  Washington State University Cooperative Extension, Oregon State University Cooperative Extension System, US Department of Agriculture.

Fertilizing farmland with yard trimmings from landscape maintenance (PDF-Online). Bary, A.I., C.G. Cogger, and D.M. Sullivan. 2016. FS222E. Washington State University Extension.

Soil management for small farms (PDF-Online). Cogger, C.G.  2000.  EB 1895.  Washington State University Cooperative Extension, Oregon State University Extension Service, University of Idaho Cooperative Extension System, US Department of Agriculture.