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Università degli Studi di Firenze Management of water scarcity through micro irrigation Dipartimento di Ingegneria Agraria e Forestale Graziano Ghinassi.

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Presentation on theme: "Università degli Studi di Firenze Management of water scarcity through micro irrigation Dipartimento di Ingegneria Agraria e Forestale Graziano Ghinassi."— Presentation transcript:

1 Università degli Studi di Firenze Management of water scarcity through micro irrigation Dipartimento di Ingegneria Agraria e Forestale Graziano Ghinassi – ITAL-ICID 5th Asian Regional Conference - Special session on Micro irrigation New Delhi, December 8th, 2009

2 Goals of modern on-farm irrigation Attention to water and energy (efficient use of the resources) Low (minimal) impact on environment Economic sustainability of farmers activity

3 Irrigation system should be: -selected according to performance and economic criteria (equipment quality, market price, …) -well designed and assembled -managed properly (i.e., working pressure, lateral length, …) Micro irrigation has the potential to achieve these goals

4 Farmers and micro irrigation Common idea: micro=water and energy saving per se Inaccurate design Modifications to the original design Poor system maintenance Unfamiliar performance Exceeding equipment technical lifetime Complex scheduling

5 Farmers and micro irrigation Farmers self-evaluation about on-farm system and practice management degree (S.E.Agr.I.T. research project): LOW: 7%; FAIR: 79%; GOOD: 14%. General excess of irrigation water (up to 160%)

6 Ve.Pro.L.G.s 2008 Test and design of drip lines and system units

7 Ve.Pro.L.G.s 2008 Test and design of drip lines and system units

8 Ve.Pro.L.G.s 2008 is a user-friendly application software created by the National Irrigation Laboratory of the University of Pisa (Italy) and supported by ARSIA Regione Toscana. Equipped with the characteristics of about 70 drip line models, measured according to standardized laboratory test. SOFTWARE DATABASE

9 Use: test existing drip systems, compare options for rehabilitation or new design, based on set performance and cost (water and energy) Input: data describing specific situations (type and position of manifold, drip lines length, field slopes, seasonal irrigation water supply, pressure at the inlet, etc..), costs (dripline, energy, …) and constraints (dripline lifetime, …) Output: driplines matching farmer requirements

10 Test on annual crops

11 Test on existing drip line - Annual crop Test on drip line Design EU

12 Test on existing drip sector - Annual crop Lay flat Test on drip sector Design EU

13 Test and improvement on perennial crops

14 Field characteristics - Vineyard Field shape Field area Field slopes In-row plant spacing Seasonal irrigation supply

15 Manifold Manifold characteristics - Vineyard Manifold type Manifold feed Monolateral Bilateral Double Central LeftRight Driplines spacing

16 Test on existing drip line - Vineyard Actual working pressure Discharge evaluation Test on dripline

17 Test on existing drip line - Vineyard Discharge along the lateral InletEnd Design EU

18 Test on existing drip line - Vineyard Pressure along the lateral InletEnd Design EU

19 Test on existing drip line - Vineyard Pressure along the lateral InletEnd Design EU

20 New option on existing drip line - Vineyard Search for optimal pressure and EU

21 New option on existing drip line - Vineyard Search for optimal pressure and EU Optimization of pressure at the inlet and EU

22 New option on existing drip line - Vineyard Pressure along the lateral InletEnd

23 New option on existing drip line - Vineyard Pressure along the lateral InletEnd Optimal pressure at the inlet

24 New option on existing drip line - Vineyard Pressure along the lateral InletEnd Optimal pressure at the inlet

25 Test on new option on existing drip line - Vineyard Discharge along the lateral InletEnd

26 Case study

27 Annual crops (average values) Central Italy

28 Measured EU in some drip systems System n.

29 Water saving allowed by careful system maintenance (estimated by Ve.Pro.L.G./s 2008)

30 Water saving allowed by careful system maintenance and Ve.Pro.L.G./s 2008 supported design

31 Apple orchard Central Italy

32 Actual operating conditions -Lateral: LDPE PN6 Ø 20 mm m spacing self-compensating emitters -4 l/h nominal discharge -200 kPa max inlet pressure -100 to 130 m length -4% field slope -Measured EU: 58% -Potential EU (estimated by Ve.Pro.L.G.s)=93.3%

33 Search for EU best options

34

35 Search for EU under given pressure (50 kPa)

36

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38 Conclusions Farmers wish for correct resources management The way drip systems operate is unsuitable to proper irrigation practice in many cases Users can play an important role in improving system performance Ve.Pro.L.G.s 2008 software is an effective tool

39 Free download

40 Thank you!


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