Doug Collins

Collins crop

Doug Collins is an Extension Faculty with WSU’s Small Farms Program and an affiliate faculty with the WSU Department of Crop and Soil Sciences. His extension programs and research focus on soil quality and vegetable and fruit production for small farms.  Doug has a Ph.D. in soil science from Washington State University, an M.S. in Plant Pathology from Montana State University, and a B.A. in biology from Colorado College. He previously worked for Ribeiro Plant Lab, Inc., Seattle Tilth Association and the Washington Toxics Coalition and served on the board of directors of Tilth Producers of Washington.

Doug is an active instructor in Ecological Soil Management for beginning and advanced producers. He conducts workshops at area conferences and for Cultivating Success™ classes. Doug’s research program is focused on organic vegetable cropping systems and managing and monitoring soil fertility.

Areas of Interest

  • Managing and monitoring soil fertility on diverse organic vegetable farms
  • Organic vegetable cropping systems, including reduced tillage
  • Soil variability across landscapes
  • Biological indicators of soil quality


Collins, D.P., C. Miles, C. Cogger, and R. Koenig.  2013.  Soil fertility in organic systems: A guide for gardeners and small acreage farmers.  Pacific Northwest Extension Fact Sheet, PNW646.

Collins, D.P.  2012.  Soil testing:  A guide for farms with diverse vegetable crops.  Washington State University Extension Fact Sheet.  EM050E.

Collins, D.P., C.G. Cogger, A.C. Kennedy, T. Forge, A.I. Bary, H.P. Collins, and R. Rossi. 2011.  Farm-scale variation of soil quality indices and association with edaphic properties.  Soil Science Society of America Journal. 75 (2): 580-590.

Wayman, S., C. Cogger, C. Benedict, I. Burke, D. Collins, and A. Bary.  2014.  The influence of cover crop variety, termination timing, and termination method on mulch, weed cover, and soil nitrate in organic reduced-tillage.  Renewable Agriculture and Food Systems. FirstView: 1-11.

Wayman, S. and D. Collins. 2013. For the life of the soil:  Farmer perspectives and experiences adopting reduced tillage organic agriculture.  Tilth Producers Quarterly. 23 (4): 1, 4-5.

Hoashi-Erhardt, W.K.,  P.P.Moore, D.P.Collins, A.I.Bary, and C.G.Cogger.  2013.  Evaluation of day-neutral cultivars for organic strawberry production in Washington.  Acta Horticulturae (ISHS) 1001:167-174

Corbin, A., D. Collins, R. Krebill-Prather, C. Benedict, and D. Moore. 2013. Adoption potential and perceptions of reduced tillage among organic farmers in the maritime Pacific Northwest.  eXtension Foundation, eOrganic Community of Practice. [Online].

Collins, D.P.  2013.  Seasonal nitrogen mineralization on organic farms.  Tilth Producers Quarterly.  23 (1): 1,4-5.

Collins, D.P., A. Corbin, C. Benedict, C. Cogger,  A. Bary,  C. Burrows,  and C. Miles.  2011.  Reducing tillage with cover crops in western Washington organic vegetable production:  early research progress and future direction. Tilth Producers Quarterly. 21 (2): 15-19.

Collins, D.P., Koenig, K.; Berman, F.  2011.  Passing knowledge through hands-on experience:  legal farm internships in Washington State.  Tilth Producers Quarterly. 21 (1): 8-11.

Collins, D.P.  2011.  Nitrogen availability from soil organic matter, fertilizer, and amendments.  Tilth Producers Quarterly. 21 (1): 12-13.

Collins, D.P.  2011.  Report card nitrate test for assessing fertilizer efficiency. Tilth Producers Quarterly. 21 (3): 11.

Collins, D.P. and B. J. Jacobsen.  2003.  Optimizing a Bacillus subtilis isolate for biological control of sugar beet cercospora leaf spot. Biological Control.  26 (2): 153-161.

Collins, D.P., B. J. Jacobsen and B. Maxwell.  2003.  Spatial and temporal population dynamics of a phyllosphere colonizing Bacillus subtilis biological control agent of sugar beet cercospora leaf spot.  Biological Control.   26 (3):  224-232.


2014-2016    Collins, D, C. Benedict, A. Corbin, A. Bary, and C. Cogger.  Increasing adoption of reduced tillage strategies on organic vegetable farms in the maritime Northwest.  Western SARE.  $249,919.

2012-2015    Collins, D., M. Ostrom, J. Garcia-Pabon,  M. Flores,   C. Benedict,  J. Busboom,  and M. Heitstuman.  Cultivating new generation and immigrant farmers in Washington State.  USDA-BFRDP.  $675,749.

2011-2014    Collins, D, A. Corbin, C. Cogger, C. Benedict, and A. Bary.  Selecting management practices and cover crops for reducing tillage, enhancing soil quality, and managing weeds in western WA organic vegetable farms.  Western  SARE.  $196,624.

2011-2012    Collins, D., C. Cogger, and A. Bary.  Measuring active carbon to predict seasonal nitrate mineralization on organic farms.  Organic Farming Research Foundation.  $14,996.


Invited Lecturer:  Nematology, Organic Fertility

2009 and 2011            Bio 368: Advanced Ecology, Pacific Lutheran University, Tacoma, WA

2009                            Plant Pathology 513: Nematology, WSU, Prosser, WA

2008                            Nematode Identification Workshop, WSU, Prosser, WA

2007, 2009, 2013        Ecological Agriculture, The Evergreen State College, Olympia, WA.


Collins, D.P. (Writer, Director, Producer, Videographer, and Video Editor) and co-writers and videographers C. Benedict, C. Corbin.  2011.  “Reduced tillage on organic farms:  virtual field day.”  [online]

Collins,D.P. and J. Garcia-Pabon  (Producers) 2013.  “Cosecha y empaque de lechugas Romanas para sanidad y calidad.” (Harvesting and packing Romaine lettuce for safety and quality).  Writer:  S. Schaeffer; Editor: T. Cogger.  [online]


Collins, D., C. Cogger, A. Bary.  2013.  Soil Sampling to direct management on diverse organic farms.  Soil Science Society of America Abstracts.

Collins, D., C. Cogger, A. Bary, C. Benedict, D. Corbin, C. Miles. 2012. Tillage reduction and cover cropping for enhanced soil quality and weed management in western Washington organic vegetable farms. Proceeding of the 6th National Small Farms Conf.  Memphis, TN.


Bethany Wolters (Thesis advisor, 2013-present).

  • Wolters, B.R., Collins, D.P., Fortuna, A.M., Cogger, C.G., Bary, A. 2014.  Greenhouse gas emissions in no-till vegetable production. Proceedings of the Agronomy Society of America. Long Beach, CA. Poster Presentation.

Becky Collier, University of Iowa graduate student (committee member, 2013-present). Research topic: Nutrient management in reduced-tillage organic agriculture vegetable systems.

David Sullivan (Thesis advisor, beginning 2015)


Katrina McCann (Pacific Lutheran University, 2011-2012).  Soil Science Society of America Golden Opportunities Scholar

  • McCann, K., D. Collins, C. Cogger, and A. Bary.  2011.  Variation in soil collembolan populations and microbial biomass on western Washington organic farms.  Soil Ecology Society Bi-Annual Meeting, Kelowna, British Columbia.  Poster Presentation.
  • McCann, K., D. Collins, C. Cogger,  and A. Bary.  2011.  Estimating long-term compost application effects on active soil carbon with 24-hour basal respiration.  Proceedings of the Soil Science Society of America, San Antonio, TX.  Poster Presentation.

Christian Bush (2014-2015). Research topic: No-till cover cropping for continuous reduced-tillage organic agriculture.

Contact Information

Small Farms and Community Food Systems; Steering Committee Chair

Center for Sustaining Ag & Natural Resources
2601 W. Pioneer Way
Puyallup, WA 98371
Phone: 253-445-4658