1. Irrigation of Fruit Trees – Established Orchard Sam Birrell, Netafim Agronomist International Pink Lady Alliance Workshop, Chile

2. 2 AGENDA Water Budgets Evapotranspiration Crop Co-efficient Crop Water Use Irrigation Scheduling When Do I Irrigate? Monitor

3. 3 Water Budgets Goodwin, Victorian DPI

4. Evapotranspiration (ETo)

5. Crop Co-efficient FAO

6. 6 Crop Co-efficient K cb = Crop Co-efficient ET o = Evapotranspiration EAS = Effective area of shade Crop Water Use Goodwin et al

7. 7 Crop Water Use  Crop Co-efficient  Crop Water Use K cb = Crop Co-efficient ET o = Evapotranspiration EAS = Effective area of shade 1.3 X 0.4 = 0.52 0.52 X 8(mm) = 4.16 (mm)

8. Irrigation Scheduling  Run Time: How Long?

9. When do I irrigate ? Drippers wet approximately 1/3 of the area ( W.A. ) Water contained in a 50 cm root zone ( R.Z. ) =RAW X R.Z. X W.A =.3 X 50 X.33 = 4.9 mm Moisture contained within the root zone or RAW of partial coverage irrigation system

10. When do I irrigate ? System application rate  System Application = emitter flow rate row spacing X emitter spacing If Row spacing = 6 M Emitter output = 2.3 L/H Emitter spacing = 0.5 M 2.3 System Application = 6 X 0.5 = 0.76 mm/H

11. When do I irrigate ? Run Time  Water used by the plant – = 4.9 mm  System application rate – = 0.76mm / H No. hours to irrigate = 4.9 / 0.76 = 6.5 hours

12. When do I irrigate ? EtEt X KcKc MonthSONDJFMA Monthly E t 7211214117018916513078 Crop Coefficient K c.21.5.6.57.55.5 Daily water use mm0.50.752.33.33.63.32.31.3 Period between irrigations = RAW / Daily water use = 4.9 / 3.3 = 1.4 days ( every day )

13. 13 Monitor  Moisture Probes

14. 14 Monitor

15. 15 Monitor

16. 16 Miscellaneous  Sub surface drip

17. THANK YOU