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  • 1. The New Zealand Institute for Plant & Food Research Limited Dynamic CA storage of avocados Technology for managing exports? Jem Burdon
  • 2. Presentation overview • Why dynamic CA (DCA) storage? • What is DCA and how is it operated? • How does New Zealand ‘Hass’ respond to DCA? • DCA as a technology for managing exports? The New Zealand Institute for Plant & Food Research Limited
  • 3. Why dynamic CA storage? • Export based industry • Storage life to reach markets • Quality after prolonged storage The New Zealand Institute for Plant & Food Research Limited
  • 4. Why dynamic CA storage? Alternative technologies: • Refrigeration, Air Insufficient storage life High rot incidence • CA with low O2 and high CO2 • SmartFresh(SM) Both: Increased storage life Prolonged ripening period High rot incidence The New Zealand Institute for Plant & Food Research Limited
  • 5. Effect of SmartFresh on ripe fruit quality Air SmartFresh Days to ripen 4.1d 10.5d Stem End Rot 29% 74% Body Rot 38% 78% External Rot 5% 52% Diffuse Flesh Discoloration 14% 1% The New Zealand Institute for Plant & Food Research Limited
  • 6. What is dynamic CA? Static CA (SCA) a pre-determined O2 level is maintained Dynamic CA (DCA) O2 level is set dependent on the fruit response to low O2 Allows greater optimisation and matching of storage conditions to the fruit tolerance to low O2 Improved CA effect at low CO2 level The New Zealand Institute for Plant & Food Research Limited
  • 7. Dynamic CA: Monitoring the fruit The New Zealand Institute for Plant & Food Research Limited
  • 8. Monitoring fruit stress under low oxygen Stress monitored as skin fluorescence by HarvestWatch™ 5 3500 3000 4 Fluoroscence (FIRM ) TM 2500 Oxygen (%) 3 2000 2 1500 1 1000 0 500 0 12 24 36 48 60 72 84 96 Time (hours) The New Zealand Institute for Plant & Food Research Limited
  • 9. Oxygen levels in SCA and DCA 20 18 Low O2 stress point 16 Back-off 14 Lowest safe O2 level Frequency Oxygen (%) 12 Spike 10 8 6 Static 4 2 Dynamic 0 c c c c c c 3 De 7 De De De De De 11 15 19 23 The New Zealand Institute for Plant & Food Research Limited
  • 10. How does NZ ‘Hass’ respond to DCA ? Comparison of fruit stored in air, SCA and DCA Key aspects • fruit condition at the end of storage • time to ripen • disorders when ripe The New Zealand Institute for Plant & Food Research Limited
  • 11. At the end of storage Skin Colour Fuzzy Patch 50 50 40 40 Colour (0-100%) Incidence (%) 30 30 20 20 10 10 0 0 Air SCA DCA Air SCA DCA The New Zealand Institute for Plant & Food Research Limited
  • 12. Time to ripen Time to ripen 8 Days to ripen 6 4 2 0 Air SCA DCA The New Zealand Institute for Plant & Food Research Limited
  • 13. When ripe Stem End Rot Body Rot External Rot 100 100 100 80 80 80 Incidence (%) 60 60 60 40 40 40 20 20 20 0 0 0 Air SCA DCA Air SCA DCA Air SCA DCA The New Zealand Institute for Plant & Food Research Limited
  • 14. When ripe Diffuse flesh discoloration 100 80 Incidence (%) 60 40 20 0 0 0 Air SCA DCA The New Zealand Institute for Plant & Food Research Limited
  • 15. How does NZ ‘Hass’ respond to DCA ? DCA is suitable for NZ ‘Hass’ • prolonged storage life • short ripening time • reduced rots The New Zealand Institute for Plant & Food Research Limited
  • 16. DCA as a technology for managing exports? Onshore Harvest better fruit / when favourable weather and store Supply out of inventory Dependent on suitable facilities Export More distant markets Improved quality Dependent on capability of shipping containers The New Zealand Institute for Plant & Food Research Limited
  • 17. Acknowledgements Work funded by: Foundation for Research Science and Technology Avocado Industry Council We are grateful to all those growers and sheds who have assisted us conducting this research over recent years Team: P&FR: Jem Burdon, Nagin Lallu, Glen Haynes, Matt Punter, Paul Pidakala, David Billing AIC: Henry Pak, Jonathan Dixon The New Zealand Institute for Plant & Food Research Limited
  • 18. The New Zealand Institute for Plant & Food Research Limited www.plantandfood.com JBurdon@hortresearch.co.nz The New Zealand Institute for Plant & Food Research Limited