1.2 Coordonnées des personnes-ressources et des institutions impliquées dans l'évaluation et la documentation de la Technologie

Nom du ou des institutions qui ont facilité la documentation/ l'évaluation de la Technologie (si pertinent)

Nom du ou des institutions qui ont facilité la documentation/ l'évaluation de la Technologie (si pertinent)

1.3 Conditions relatives à l'utilisation par WOCAT des données documentées

Le compilateur et la(les) personne(s) ressource(s) acceptent les conditions relatives à l'utilisation par WOCAT des données documentées:

Oui

1.5 Référence au(x) Questionnaires sur les Approches de GDT (documentées au moyen de WOCAT)

Sustainable use of water [Grèce]

Sustainable use of water

• Compilateur : Costas Kosmas
• 30 juin 2009 00:00

2.1 Courte description de la Technologie

Définition de la Technologie:

Drip irrigation, also known as trickle irrigation is a method which minimizes the use of water and fertilizer by allowing water to drip slowly to the roots of plants, either onto the soil surface or directly onto the root zone, through a network of valves, pipes, tubing, and emitters.

2.2 Description détaillée de la Technologie

Description:

Irrigation is very important for increasing crop yields in arid, semi-arid and dry sub-humid climates. The area of irrigated land has increased more than twice in the last decades in the study areas. In recent years, the considerable reduction of winter and autumn rainfall has caused a serious lack of water resources. The production of the various crops is substantially reduced if water is not provided during the summer period.
The high demands for water consumption or other economic activities have increased the price of water, forcing up the cost of agricultural production. In addition, in many cases, low quality (with high electrical conductivity) water is used for irrigation. The need for intensification of agriculture to meet the high cost of production, the use of poor quality of water, the lack of drainage systems are in many cases responsible for soil degradation resulting from water logging, salinization, alkalinization, and soil erosion.

Purpose of the Technology: Drip or trickle irrigation achieves the highest irrigation efficiency since about 90% of the applied water is available to the plants. This SWC technology is especially suitable for watering trees or other large plants keeping strips among trees dry. Application of water by drip irrigation can be considered more as more efficient method using low quality of irrigation water. Irrigation water of high salt content can be applied in higher quantities in spots leaching salts to deeper soil layers. Drip irrigation can be applied in any type of soil from coarse- and fine-textured and without any limitation to slope gradient requiring little labour during installation.

Establishment / maintenance activities and inputs: In the study area of Chania trickle irrigation system includes mainly three branches from the outlet of main water network transportation system to the application in the trees. The last branch consists of plastic tube 12 to 32 mm in diameter that lies either on or just below the soil surface and applies the water either through small holes in the line or through emitter nozzle.

Natural / human environment: In recent years the increasing awareness of farmers on issues relating to the sustainability of the environment and conservation of water by promoting SWC technologies has led to widespread of use of drip irrigation in the area of Crete and in many other parts of the Country. The categorization of the specific SWC technology according to the WOCAT questionnaire is defined as: CtWtA3.

2.3 Photos de la Technologie

2.5 Pays/ région/ lieux où la Technologie a été appliquée et qui sont couverts par cette évaluation

Pays:

Grèce

Région/ Etat/ Province:

Kidonia

Autres spécifications du lieu:

Chania Crete

Commentaires:

Total area covered by the SLM Technology is 480 km2.

Map

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2.7 Introduction de la Technologie

Spécifiez comment la Technologie a été introduite: :

• au cours d'expérimentations / de recherches

3.2 Type(s) actuel(s) d'utilisation des terres, là où la Technologie est appliquée

Terres cultivées

• Plantations d’arbres ou de buissons

Plantations d'arbres et d'arbustes - Précisez les cultures:

• olive

Précisez:

Longest growing period in days: 120Longest growing period from month to month: March to JuneSecond longest growing period in days: 150Second longest growing period from month to month: March to June

Commentaires:

Major land use problems (compiler’s opinion): availability of irrigation water, loss of water in the network, conflicts between districts and economic sectors of tourism and agriculure

Major land use problems (land users’ perception): availability of irrigation water, conflicts between districts and economic sectors of tourism and agriculure

Livestock is grazing on crop residues

3.4 Approvisionnement en eau

Approvisionnement en eau des terres sur lesquelles est appliquée la Technologie:

• mixte: pluvial-irrigué

3.5 Groupe de GDT auquel appartient la Technologie

• gestion de l'irrigation (incl. l'approvisionnement en eau, le drainage)

3.6 Mesures de GDT constituant la Technologie

pratiques agronomiques

• A3: Traitement de la couche superficielle du sol

structures physiques

• S11: Autres

Commentaires:

Main measures: agronomic measures

Secondary measures: structural measures

Type of vegetative measures: in blocks

3.7 Principaux types de dégradation des terres traités par la Technologie

dégradation hydrique

• Ha: aridification

Commentaires:

Main type of degradation addressed: Ha: aridification

Main causes of degradation: disturbance of water cycle (infiltration / runoff) (lack of water), education, access to knowledge and support services (lack of knowledge)

Secondary causes of degradation: over abstraction / excessive withdrawal of water (for irrigation, industry, etc.) (salinization)

3.8 Prévention, réduction de la dégradation ou réhabilitation des terres dégradées

Spécifiez l'objectif de la Technologie au regard de la dégradation des terres:

• prévenir la dégradation des terres

Commentaires:

Secondary goals: prevention of land degradation

4.1 Dessin technique de la Technologie

Spécifications techniques (associées au dessin technique):

In the study area of Chania trickle irrigation system includes mainly three branches from the outlet of main water network transportation system to the application in the trees. The last branch consists of plastic tube 12 to 32 mm in diameter that lies either on or just below the soil surface and applies the water either through small holes in the line or through emitter nozzles.

Location: Kasteli. Chania

Date: March 2007

Technical knowledge required for land users: moderate (system installation requirements)

Main technical functions: improvement of ground cover

Secondary technical functions: increase in organic matter, increase of biomass (quantity)

In blocks
Vegetative material: C : perennial crops
Number of plants per (ha): 250
Vertical interval between rows / strips / blocks (m): 5
Spacing between rows / strips / blocks (m): 5
Vertical interval within rows / strips / blocks (m): 5
Width within rows / strips / blocks (m): 4

Perennial crops species: olives

Slope (which determines the spacing indicated above): 15.00%

Gradient along the rows / strips: 15.00%

Structural measure: irrigation system
Spacing between structures (m): 8

Construction material (other): plastic, plastic tubes 12-32 mm in diameter

Other type of management: Water distribution among farmers, water is provided under the control of local authorities

Auteur:

C. Kosmas

4.3 Activités de mise en place/ d'établissement

4.4 Coûts et intrants nécessaires à la mise en place

Commentaires:

Duration of establishment phase: 0.1 month(s)
Life span of the irrigation network: 20 years

4.5 Activités d'entretien/ récurrentes

4.6 Coûts et intrants nécessaires aux activités d'entretien/ récurrentes (par an)

Commentaires:

Machinery/ tools: hand tools, System of applying fertilizers through the irrigation water, filters for keeping various solid materials

per hectare of land affected

4.7 Facteurs les plus importants affectant les coûts

Décrivez les facteurs les plus importants affectant les coûts :

the reguired materials (tubes, filters, etc)

5.1 Climat

5.2 Topographie

5.3 Sols

Si disponible, joignez une description complète du sol ou précisez les informations disponibles, par ex., type de sol, pH/ acidité du sol, capacité d'échange cationique, azote, salinité, etc.

Soil fertility is very high-medium
Soil drainage/infiltration is good
Soil water storage capacity is high-very high

5.4 Disponibilité et qualité de l'eau

Commentaires et précisions supplémentaires sur la qualité et la quantité d'eau:

Ground water table: 5-50 m, > 50 m

Water quality (untreated): good drinking water, for agricultural use only (irrigation)

5.5 Biodiversité

5.6 Caractéristiques des exploitants des terres appliquant la Technologie

Indiquez toute autre caractéristique pertinente des exploitants des terres:

Land users applying the Technology are mainly common / average land users

Difference in the involvement of women and men: Women in rural areas are involved in other type of work

Population density: 10-50 persons/km2

Annual population growth: 1% - 2%

5% of the land users are rich (cost for buying materials).
55% of the land users are average wealthy.

Off-farm income specification: working in tourist business

5.7 Superficie moyenne des terres utilisées par les exploitants des terres appliquant la Technologie

5.8 Propriété foncière, droits d’utilisation des terres et de l'eau

Propriété foncière:

• individu, avec titre de propriété

Droits d’utilisation des terres:

• loué
• individuel

Droits d’utilisation de l’eau:

• communautaire (organisé)
• individuel

5.9 Accès aux services et aux infrastructures

6.1 Impacts sur site que la Technologie a montrés

Impacts socio-économiques

Production

Disponibilité et qualité de l'eau

Revenus et coûts

Impacts socioculturels

Impacts écologiques

Sols

Biodiversité: végétale, animale

Autres impacts écologiques

6.2 Impacts hors site que la Technologie a montrés

6.3 Exposition et sensibilité de la Technologie aux changements progressifs et aux évènements extrêmes/catastrophes liés au climat (telles que perçues par les exploitants des terres)

Extrêmes climatiques (catastrophes)

Catastrophes hydrologiques

Commentaires:

Control of flooding by adjusting river bed

6.4 Analyse coûts-bénéfices

Quels sont les bénéfices comparativement aux coûts de mise en place (du point de vue des exploitants des terres)?

Quels sont les bénéfices comparativement aux coûts d'entretien récurrents (du point de vue des exploitants des terres)?

6.5 Adoption de la Technologie

Si disponible, quantifiez (nombre de ménages et/ou superficie couverte):

3850

De tous ceux qui ont adopté la Technologie, combien d'entre eux l'ont fait spontanément, à savoir sans recevoir aucune incitation matérielle, ou aucune rémunération? :

• 11-50%

Commentaires:

65% of land user families have adopted the Technology with external material support

2200 land user families have adopted the Technology with external material support

35% of land user families have adopted the Technology without any external material support

1650 land user families have adopted the Technology without any external material support

There is a moderate trend towards spontaneous adoption of the Technology

6.7 Points forts/ avantages/ possibilités de la Technologie

6.8 Faiblesses/ inconvénients/ risques de la Technologie et moyens de les surmonter

7.1 Méthodes/ sources d'information