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Biochar for Sand-Based Root-Zone Modification

This study by Nick Christians and Shane Brokhoff from Iowa State University explores the integration of biochar into sand-based root zones for turfgrass, specifically creeping bentgrass. It examines the effects of various volume-to-volume mixtures of biochar and sand on soil properties such as water retention, hydraulic conductivity, and nutrient availability. Findings reveal that biochar enhances soil water retention but decreases saturated hydraulic conductivity and rooting depth for mixtures exceeding 10% biochar, while also improving the leachate's electrical conductivity and total organic carbon content.

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Biochar for Sand-Based Root-Zone Modification

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  1. Biochar for Sand-Based Root-Zone Modification NICK CHRISTIANS SHANE BROKHOFF IOWA STATE UNIVERSITY

  2. BIOCHAR AND TURF Sand-based turfgrass root-zone United States Golf Association (USGA)

  3. BIOCHAR AND TURFturf • Sand-based turfgrass root-zone • United States Golf Association (USGA)

  4. Why biochar and turf… sand:peat moss 90:10 or 80:20 Root-zone mix Intermediate layer Coarse gravel Drainage tile (USGA, 1993)

  5. OBJECTIVES Sand and biochar root-zone mix: soil water retention properties saturated hydraulic conductivity rooting depth of creeping bentgrass (Agrostis stolonifera L.) chemical properties

  6. BIOCHAR • switchgrass (Panicumvirgatum • FAST PYROLYSIS • Center for Sustainable Environmental Technologies (CSET) at Iowa State University

  7. Treatments • Six volume-to-volume mixtures of biochar and sand

  8. Ksat of Six Biochar and Sand Treatment Mixtures (n=4)

  9. Chemical properties • Leachate • Electroconductivity (EC) • pH • Total organic carbon (TOC) • Nutrient analyses • Soil • Nutrient analyses

  10. LEACHATE pHpH 0 5 10 15 20 25 Biochar percentage (v/v)

  11. LEACHATE P 0 5 10 15 20 25 Biochar percentage (v/v)

  12. Soil K LEACHATE K 0 5 10 15 20 25 Biochar percentage (v/v)

  13. Conclusions • Biochar increases soil water retention • Biochar decreases saturated hydraulic conductivity • Biochar decreases rooting depth of creeping bentgrass in media containing more than 10% (v/v) biochar • Biochar increases leachate EC, TOC; provides essential nutrients

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