Biosolids as a Value-Added Product - Aventri · PDF file Biosolids as a Value-Added Product...

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Transcript of Biosolids as a Value-Added Product - Aventri · PDF file Biosolids as a Value-Added Product...

  • Biosolids as a Value-Added Product

    Dan M. Sullivan

    Soil Scientist

    Crop & Soil Science

    Oregon State University

    Biofest. Chelan, WA Sept, 2018

  • Principles

    • Product knowledge (today’s topic)

    • Know your region

    • Take advantage of local alliances

    • Listen to the plants\crops

    • Listen to the customers

    • “Bloom where you are planted”

  • Product knowledge

    • Think in terms of the customer

    • Biosolids are usually a replacement for an existing fertilizer or soil amendment

    • How does your biosolids product compare to competition?

  • How biosolids are unique

    • Biosolids have more consistent properties than manure or most competing organics

    • Biosolids are low in soluble salts (electrical conductivity)

    • Biosolids are an especially effective amendment to increase soil organic matter

  • How biosolids are unique

    • Composts. Applied at high rates, biosolids composts acidify soil. Manure or yard debris composts increase soil pH. So biosolids compost is ideal for rhodies…

    • High pH soils (calcareous). Biosolids are effective source of metal micronutrients like zinc.

  • New publication from OSU: Interpreting compost analyses, available online Oct 2018

  • Research review

    1. Nutrients in biosolids

    2. Balance of nutrients supplied by biosolids vs. crop needs

    3. Persistence of of biosolids organic matter in soil

    4. Biosolids compost for ornamentals

  • Pacific NW Extension publication 508-E

  • Nutrients

  • Biosolids: fertilizer replacement value of nutrients

  • Nutrient balance

    • Biosolids supply more P than crops need

    • Long term application of biosolids builds soil P, sometimes to excessive levels

  • Agronomic and environmental interpretations of soil test P.

  • Soil phosphorus (Olsen P test) after five biosolids applications (over 16 yr)

    Douglas County, WA

  • East of Cascades: long term research. New publication: PNW 716.

  • Soil organic matter (carbon or C) after five biosolids applications (over 16 yr)

    Douglas County, WA

  • Long term findings: dryland wheat

    • Biosolids increased soil organic matter (4 to 6 inch depth) by more than 50%

    • Biosolids enriched supply of immobile nutrients (e.g. P and Zn)

    • Biosolids were an effective replacement for N fertilizer for the crop following application

    • Soluble salt accumulation was minimal

    • Wheat grain yield was sometimes increased by biosolids (compared to commercial N fertilizer)

  • Comparing carbon sequestration of biosolids vs. other organics Pendleton, OR. 10-yr trial

  • Biosolids were most effective C input to sequester C in soil

  • Biosolids effective pasture input at 6-8 inch rainfall dryland site

    Echo, Oregon City of Portland biosolids

    with biosolids

    no biosolids

  • Biosolids effective pasture input at 6-8 inch rainfall dryland site

    Echo, Oregon City of Portland biosolids

  • Biosolids compost vs. yard debris compost trial, western Oregon

  • Year

    2009 2010 2011 2012

    S o

    il p

    H (

    1 :1

    m e

    th o

    d )

    5.0

    5.2

    5.4

    5.6

    5.8

    6.0

    6.2

    6.4

    Biosolids compost acidified soil

    Biosolids compost

    Yard debris compost

    No compost

  • Acid-loving plant (Pieris japonica)

    yard debris

    compost

    biosolids

    compost

    June 2014. Six years after transplanting

  • Thank you! Dan.Sullivan@oregonstate.edu