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Aerated water irrigation on table grapes

Aerated water irrigation on table grapes. Surya P. Bhattarai , David J. Midmore and Lance Pendergast . Introduction & outline. Background to oxygation research Introduction to concept “Oxygation”, what is it? Brief overview of research to date Grapes Future focus / activities.

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Aerated water irrigation on table grapes

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  1. Aerated water irrigation on table grapes Surya P. Bhattarai, David J. Midmore and Lance Pendergast

  2. Introduction & outline • Background to oxygation research • Introduction to concept “Oxygation”, what is it? • Brief overview of research to date • Grapes • Future focus / activities

  3. Plant / oxygen • Active roots are major sinks for oxygen in plants -consume about x 9 their volume of oxygen gas each day • In plant cells, oxygen participates in over 200 different cellular chemical reactions • 95 % oxygen consumption is devoted towards energy needs (production of ATP) from carbohydrates) • Poor soil aeration is a major abiotic stress that limits the success of crops

  4. Water in-air out Bigger wetting front in clay Wetting front ubiquitous of SDI Left: Wetting front after 10 h irrigation @ 1.7 l h-1 from simulated emitter at 0.30 m in a loamy soil (Battam et al., 2003). Right: Simulated wetting front after 12 h irrigation applied at 1.25 l h-1 from emitter installed at a depth of 0.40 m in a sandy (left) and clay (right) soil (Source: Thorburn et al., 2001)

  5. Oxygation@CQU Research for Impact (Concept testing-industry adoption) Driver:Improving crop water productivity Issue:Impeded soil aeration associated with irrigation Approach: Aerated water irrigation (oxygation) M-Air injector Mixaerator Theory-1 Seair Test Verify Adopt Improve Diversify

  6. Field trials, research outreach and industry collaboration for oxygation of annual and perennial crops

  7. Cotton field trials Location: Nyang, Emerald, Soil: Vertosol, Irrigation: SDI, Trt: Oxygation & control, Replication:~6, Plot size:0.4 ha, Paddock: 0.4 x 12=4.8ha, Air injector: 12% by MI-1583, Irrigation: 6.3ML/ha Lint yield (bales/ha) in vertosol over seven seasons Results: 14.7% higher lint yield

  8. Pineapple @Valley Syndicate, Yeppoon Planting:24/10/07 (GC-2), Oxygation:14/03/08, Harvest:05/01-17/04/09, Mazzei-1583, Drip-Hydro PC 16/20 0.3m 1.2L/hr

  9. Table grapes at Emerald QLD

  10. Table . Leaf gas exchange, chlorophyll content, soil fluorescien (surrogate of microbial load), and soil respiration with and without oxygation in grapevine plot at Emerald, CQ, Australia. Figure : Effects of oxygation and depth (Deep = 15cm, Shallow = 2cm) of drip placement on dry weight of grape variety Flame at pattern of soil AACC, Emerald, CQ, Australia.

  11. Table. Marketable berry yield and load per plant for table grapes (Menindee) with and without oxygation ( Emerald, Central QLD). Figure : Soil respiration immediately after irrigation in oxygation and control plot

  12. Oxygation Monitoring of bubbles in irrigation water Uniformity of bubble distribution • Collaboration • ANSTO, Netafim Australia • CQU computational sciences.

  13. Effect of surfactant

  14. Cost:benefit analysis Table: Details of cost to retro-fit air injection to 0.4 ha plots cotton SDI site * Costs would be less if installed with new system Table: Details of returns per ha

  15. Industry perspective • System compatibility with current operation(retrofitting) • Ease of operation (“passive”) • Need for extension/technical support • Industry / grower enthusiasm? • Increased opportunity for collaborations

  16. Future activities on oxygation • Long term effects on soil properties • Nutrient dynamics & movement of pollutants • Aerated water for furrow irrigation • Extending adoption by industries (sugarcane, hort) • Diversification (GHG- NOx, smart lawn-urban water security) • Uniformity of air distribution in the field • Optimization of drip/SDI

  17. Acknowledgements • NPSI, Guy Roth • HAL • DAFF Emerald • Netafim Australia • Particular thanks to the Growers - Tony Ronnfeldt - Glen Pearmine - John Crainey

  18. Oxygation PARTNERSHIP and Collaboration Growth Thank you

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