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W. Roland Leatherwood 1 Neil S. Mattson 1

Possible Roles of Silicon and Regulated Deficit Irrigation on Poinsettia Plant Quality and Postharvest Performance. W. Roland Leatherwood 1 Neil S. Mattson 1. 1 Department of Horticulture, Cornell University. Silicon Background. Abiotic stress

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W. Roland Leatherwood 1 Neil S. Mattson 1

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  1. Possible Roles of Silicon and Regulated Deficit Irrigation on Poinsettia Plant Quality and Postharvest Performance W. Roland Leatherwood1 Neil S. Mattson1 1Department of Horticulture, Cornell University

  2. Silicon Background • Abiotic stress • Improved adventitious rooting (Moon 2008, Gillman 2000), Decreased leaf abscission (Gillman 2000) • Heat stress (Agarie 2008) • Drought Stress (Gao 2004, Agarie 2008) • Horticultural characteristics • Flower diameter, stem caliper (Kamenidou 2008, 2005), branching (Moon 2008) • Little on Si & Greenhouse Crops • Industry acceptance of Si as supplemental nutrient is uneven

  3. Methods • Plant material • ‘Prestige Red’ and ‘Peterstar Red’ Poinsettia rooted cuttings • 6” Pots, commercial media. • Nutrition • N 200 mg·L-1 (21-5-20) • Mg 30 mg·L-1 (MgSO4 · 7H20) • S 32 mg·L-1 (MgSO4 · 7H20) • Mo 0.1 mg·L-1 (Na2Mo4 · 2H2O)

  4. Methods • Treatment design • CRD, 15 replicates • Two way factorial of deficit irrigation and silicon supplementation • 100, 80 and 60% RDI • Si 0 and 56 mg·L-1 (KSiO3) (2 mM) • Statistical analysis • SAS V9.1 Tukey’s HSD with an α=0.05 • Irrigation water (RO) Si was ND and substrate Si concentration was 2.0 mg·L-1

  5. Peterstar

  6. Peterstar

  7. Prestige

  8. Disease

  9. Disease

  10. Strength Photo B. Whipker

  11. Strength

  12. Findings • Si interacts with plant water status giving differential results • No or moderate water stress, Si decreased height and bract area • Severe water stress, Si increased height and bract area • Si improves lateral branch strength and may reduce Pythium occurrence.

  13. Postharvest

  14. Materials & Methods • Plants were thoroughly watered • Moved to postharvest December 1st • Leaf angle measured 12/1 and periodically thereafter terminating December 17th • Measured uppermost fully expanded free hanging green leaves (3x) • 12 Hour day, florescent lighting, 21° C

  15. Postharvest Wilt

  16. Postharvest Wilt17 Days Postharvest

  17. Postharvest Wilt

  18. Bract Edge Burn

  19. Bract Edge Burn

  20. Findings • Si supplementation forestalls wilt and may improve recovery from water stress • There may be interactions with RDI and Si • Si supplementation reduces BEB in well watered plants and may increase it in water stressed plants

  21. Acknowledgements • Post/Schenkel Endowment • USDA Hatch Funds • Ecke Ranch • Rachel Brinkman

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