German National Committee of ICID (GECID) - PowerPoint PPT Presentation

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German National Committee of ICID (GECID)

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  1. German National Committee of ICID (GECID) Possibilities of using the drip irrigation laterals on centre pivot irrigation machinesJano Anter, Dr. Heinz Sourell, Hans-Heinrich Thörmann, Federal Research Institute for Rural Areas, Forestry and Fisheries, GermanyInstitute of Agricultural Technology and Biosystems Engineering 27 June 2012, Adelaide

  2. Contents • Irrigation in Germany • Advantages & disadvantages of drip irrigation and center • pivot • Steps to mobile drip irrigation • Technical aspects • Costs analysis • Summary

  3. Irrigation in Germany • 3% oftheagriculturallandareirrigated in Germany • Humid climate, dry periods, sandysoils • Culturesworthofirrigation: i.e. Potatos, Sugar beets • Useof modern irrigationtechniques • The techniquesaredeveloped in termsofclaimsbyfarmers: - Waterdistrubtion - Intensityoflabour - Water-efficient - Energyconsumption

  4. Water distribution-systems

  5. Advantages & disadvantages of drip irrigation • + • High water use efficiency • Low water losses • Low energy requirements • Possibility of chemigation • - • High total costs • High labour requirements for the assembly and disassembly

  6. + Full-Automaticmachinemanagement Low labourrequirements Moderate capitalrequirement Simple touse - Waterlosses Wind drift High energyrequirements Advantages & disadvantages of center pivot with sprinkler

  7. Operating costs Drip Irrigation Center Pivot

  8. Center pivot Drip irrigation Mobile Drip Irrigation Steps to mobile drip irrigation

  9. Installation of mobile drip irrigation by centre pivot

  10. Field experiments • The Center pivotconsisting 9 towers • The total lenghtofthispivotmachine was approximately 428 m • The total irrigatedareaofabout 57 ha • Driptubesdistance: 0.75 m • In thefieldinvestigations, twooperatingpressureswereusedattheinletofthedriptubes (50 kPaand 100 kPa)

  11. Emitters Mobile dripirrigationneedsemittersthathave: • High discharge(8 l/h & 10 l/h) • Low distancebetweenthem(0.15 m) Toreducethelenghtofdriptubesandthenumbersofemitters • High emissionuniformity(over 95 %) • Low coefficientofvariation(lowerthan 5 %) Toenhanceirrigationwaterdistrubtion on thesoilsurface

  12. Length of drip tubes at two pressures • The lenghtofthedriptubesisdependent upon theemitterdischarge • andthedistancefromthepivotpoint • The lenghtofthedriptubesincreasesasthedistancefromthepivot • pointgrows • Forthestabilityofthecentrepivotirrigator, additional frictionforceis • important • The frictionforceat 50 kPawerehigherthanthefrictionforceat 100 kPa (2470 N & 1743 N attheninthtower) • This forceissuitablefortheelectricmotorswhicharemounted on eachtower.

  13. Length of drip tubes at two pressures

  14. Costs analysis (Capital requirement)

  15. Costs analysis (Operating costs)

  16. Summary • High water efficiency / Water saving up to 20% • Energy conservation up to 40% • The total costs of MDI were close to the total costs of a CP • For the same area we need only 1,6 % respectively of the tubes that would needed for a SDI • Filtering of the water can become important • Further experiments with other plants is necessary

  17. Many thanks for your attention!