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Assessment of Biodegradable Mulch Materials in Agricultural Applications

This report details the activities and findings of the Materials Working Group led by Doug Hayes at the SCRI Annual Meeting held in Lubbock, TX, on June 1, 2011. The group focused on performance assessments of core biodegradable materials (BDMs), including the preparation of spunbond PLA mulches, physical and mechanical strength testing, and various greenhouse studies. Key initiatives included analyzing weather resistance and degradation processes of BDMs, with statistical analyses ongoing to evaluate their effectiveness in agricultural settings.

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Assessment of Biodegradable Mulch Materials in Agricultural Applications

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  1. Report, Materials Working Group Douglas G. Hayes Materials Working Group Leader DeptBiosystemsEng & Soil Sci Univ Tennessee dhayes1@utk.edu SCRI Annual Meeting, Lubbock, TX 6/1/11

  2. Materials WG Membership • Univ Tennessee • Doug Hayes, Professor, BiosystemsEng & Soil Sci • Larry Wadsworth, Professor Emeritus, Material SciEng • SathishDharmalingam, PhD Student, BiosystemsEng • Tyler Pannell, Undergraduate Research Assistant, BiosystemsEng • Galina Melnichenko, Research Associate • Washington State University • Karen Leonas, Professor, Apparel, Merchandising, Design & Textiles • Hang Liu, Postdoctoral Research Associate • Jeremy Cowan, PhD Student • Several undergraduate research associates SCRI Annual Meeting, Lubbock, TX 6/1/11

  3. Activity I Summary • (Conduct performance assessments ..selected core BDMs) • I-A: Preparing Spunbond PLA mulches for Year 1 study (Larry) √ • I-B: Physical / Mechanical Strength testing of BDMs (Times 0 & 1; phys @ WSU; MW @ UTK): Statistical analysis is being conducted√ • SCRI Best Practices Protocol: “Sampling, Labeling, and Shipping of Biodegradable Mulch Field Samples..”, √ 03/31/10 • SCRI Best Practices Protocol: “Receiving, Storing, Sampling & Cleaning Mulches ..”√ 3/25/10. SCRI Annual Meeting, Lubbock, TX 6/1/11

  4. Activity II Summary • (Analysis of Spunbond PLA Mulches ..) • II-A: Greenhouse Study 1 √ • Greenhouse Study 2: Mr. Dharmalingam will discuss on 6/2 (in progress) • II-B: (Weather resistance performance assessment) in progress (delayed due to equipment issues) • II-C: Biodegradation testing .. Will initiate in July, 2011 at Mich St Univ (Doug, Sathish, Ramani, ElodieHarblote) SCRI Annual Meeting, Lubbock, TX 6/1/11

  5. Activity III+VI Summary • (Evaluate 2010 Core BDMs in HT and Open Field ..) • III-D-iv: (Physical/chemical analysis of BDMs in high tunnels / field studies)  • Testing is completed for 2010 studies. Statistical analysis is currently being performed. • 2011 involves a new Spunbond PLA product: lower MW; black • 2011 studies: samples are being shipped to the MWG. • VI-B: Plans have been made to prepare a new PLA/poly(hydroxyburyrate) blend-based BDM later in 2011 (Larry) SCRI Annual Meeting, Lubbock, TX 6/1/11

  6. Greenhouse Study 1, Results (Activity II-A) • L.C. Wadsworth, D.G. Hayes, A.L. Wszelaki, T.L. Washington, J. Martin, J. Lee, C. T. Pannell, C. Miles, and D.A Inglis. Study of Biodegradable Mulch Materials in a Greenhouse Environment—Part 1, Cellulosic & Melt-spun 100% PLA Nonwovens, JEFF Journal, in preparation (2011) SCRI Annual Meeting, Lubbock, TX 6/1/11

  7. Activity II-B(Weather Resistance) • Samples will be exposed to weathering for 0 √, 100 √, 250, and 500 h. • (Latter 2 times) to be completed by Nov 2011. • 100 h test results: • no surface degradation (Scanning Electron Microscopy (SEM). • The changes in physical and mechanical properties vary from mulch to mulch. • Tensile load in machine direction (100 h): BioBagand BioTelo↓; other mulches: not significant changes SCRI Annual Meeting, Lubbock, TX 6/1/11

  8. Activity III-D Results SCRI Annual Meeting, Lubbock, TX 6/1/11

  9. Activity III-D Results SCRI Annual Meeting, Lubbock, TX 6/1/11

  10. Activity III-D Results SCRI Annual Meeting, Lubbock, TX 6/1/11

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