Doug Collins

Doug Collins

Doug Collins

Speaker | Washington State University Center for Sustaining Agriculture and Natural Resources (CSANR)

Puyallup, WA | dpcollins@wsu.edu

Doug Collins is an Extension Faculty and Soil Scientist with WSU’s Center for Sustaining Agriculture and Natural Resources. Doug has a Ph.D. in soil science from Washington State University and an M.S. in Plant Pathology from Montana State University. He focuses on managing and monitoring soil fertility on diverse organic vegetable farms and evaluating soil quality in different vegetable cropping systems – including organic reduced tillage. Doug is also interested in soil variability across landscapes and biological indicators of soil quality.

Session Code: 5E

Track: Uses, Markets and Marketing

Session Name: Building Specifications & Product Knowledge

Session Time: Wednesday, January 26, 11:00 AM to 12:30 PM

Presentation Title: Tracking Organic Matter in Soil and Compost

Presentation Description: Among the many benefits of compost to soil is the addition of organic matter to soils. Organic matter increases nutrient- and water-holding capacity, adds slow-release nutrients, builds soil structure, and reduces compaction. However, many people misunderstand how to calculate the number of cubic yards of compost to add, in order to follow industry recommendations or specifier requirements for the target % organic matter. To understand how to do this calculation, the bulk density of both the target soil and the compost product in question are needed. This talk will discuss what organic matter is, how addition of compost changes soil physical and chemical properties, and how we can best measure those properties.