irrigation systems


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Water savings potentials of irrigation systems : global simulation of processes and linkages.
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Global agricultural production is heavily sustained by irrigation , but irrigation system efficiencies are often surprisingly low. However, our knowledge of irrigation efficiencies is mostly confined to rough indicative estimates for countries or regions that do not account for

Efficiencies of Florida agricultural irrigation systems
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Irrigation efficiency is a measure of (1) the effectiveness of an irrigation system in delivering water to a crop, or (2) the effectiveness of irrigation in increasing crop yields. From definition (1), irrigation efficiency be expressed as the ratio of the volume of water used or

Spray evaporation losses from sprinkler irrigation systems
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Afin dam liorer la conservation de leau et de l nergie en irrigation , il est important de minimiser les pertes deau des systèmes. Leau est perdue lors de lentreposage, du transport et de lapplication au champ. Pour les systèmes d irrigation par aspersion, la perte

Irrigation systems , subsurface drip
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Subsurface drip irrigation (SDI) is generally defined as the application of water below the soil surface through emitters, with discharge rates in the same range as drip irrigation . While this definition is not specific regarding depth below the soil surface, most SDI laterals

Alternative irrigation systems for arid land restoration
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Southern California desert restorationists have studied traditional methods and developed innovative ways to efficiently water new plantings. best. Steel tanks rust and are more expensive. The plastic tanks cost about $1 per gallon of storage capacity. The tanks should

Hydraulic design of drip irrigation systems
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I-PAl WU, TERRY A. HOWELL, and EDWARD A. HILER HAWAII AGRICULTURAL EXPERIMENT STATION, UNIVERSITY OF HAWAII I-PAl WU is Professor and Agricultural Engineer, Agricultural Engineering Department, University of Hawaii. TERRY A. HOWELL is Agricultural Engineer

Livelihoods in the Asqalan and Sufi-Qarayateem Canal Irrigation Systems in the Kunduz River Basin
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The stated aims of the Social Management of Water in Afghanistan (SMWA) Projectthat GAA are undertaking, are to engender sustainable and technical water management capacities in the Kunduz River Basin of Northern Afghanistan. These aims are all governed

Design and management of irrigation systems
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Irrigation systems should be a relevant agent to give solutions to the increasing demand of food, and to the development, sustainability and productivity of the agricultural sector. The design, managing, and operation of irrigation systems are crucial factors to achieve an

Observations on water markets for irrigation systems
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Although originally asked to address the subject of water markets in East Asian rice cultivation, I would instead like to describe three water markets I have observed. I am not familiar with water markets in East Asia; moreover, I doubt such markets would be very

Institutional imperatives and coproduction strategies for large irrigation systems in India
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While the rationale for pricing of irrigation water is multifaceted and indisputable especially in the context of liberalisation (for a recent review, see Sampath), the argument that pricing and other market mechanisms as a panacea for all ills of irrigation systems is

Transmission of Pelargonium flower break virus (PFBV) in irrigation systems and by thrips
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MATERIALS AND METHODS PFBV infection in recirculating nutrient solutions. Cultivation channels (Batu Rinnen, length 250 cm, width 15 cm) covered with polyethylene-foil were placed on four separate tables, and the solution was pumped from three separate nutrient

Emitter clogging and effects on drip irrigation systems performances
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Emitter clogging is one of the most important factors that affect the performances on drip irrigation systems . Emitter clogging, which is formed in a short time due to irrigation systems running under an inadequate pressure or owing to water quality, not only negatively

Irrigation and income-poverty alleviation: a comparative analysis of irrigation systems in developing Asia
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This study forms part of the ADB-funded multi-country project on Pro-poor intervention strategies in irrigated agriculture in Asiaimplemented by the International Water Management Institute (IWMI) in collaboration with national partners in six Asian countries

Infrastructure and Water Distribution in the Asqalan and Sufi-Qarayateem Canal Irrigation Systems in the Kunduz River Basin
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The choice to survey the canal systems of Asqalan and Sufi-Qarayateem was made because both systems are in the vicinity of Kunduz city. Due to security concerns surveys were only conducted during day light. As the main irrigation season only started at the end of

Efficiencies of irrigation systems used in Florida nurseries
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Irrigation efficiency is a measure of (1) the effectiveness of an irrigation system in delivering water to plants or (2) the effectiveness of irrigation in increasing plant production. From definition (1), irrigation efficiency be expressed as the ratio of the volume of water used

Irrigation systems performance in Egypt
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Water is one of the most important inputs of the economic development. Size, type, and location of the economic activities depend on the nature, quantity, and quality and location of the available water resources. The less the water resources are and the more the demand

Field evaluation of various mathematical models for furrow and border irrigation systems
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In this study, three mathematical models in the SIRMOD package including the hydrodynamic (HD), zero inertia (ZI), and kinematic wave (KW) models were tested using the data from several field experiments for both border and furrow irrigation systems . Five data

Impact of irrigation management transfer on the performance of irrigation systems : A review of selected Asian experiences
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During the last two decades, transferring the responsibility for irrigation management from government agencies to farmer associations has been a dominant component of irrigation sector policy in several Asian countries. This paper synthesises the most significant

Management of Elodea in Australian irrigation systems
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The occurrence, adverse effects, and control of elodea (Elodea canadensis Rich.) in the irrigation systems of South East Australia are described. Eradication of new infestations by soil-residual herbicides has been attempted, but the dis-advantages of phytotoxic

Sassanian and early Islamic water-control and irrigation systems on the Deh Luran plain, Iran
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The data presented in this paper were derived as part of a comprehensive, ongoing archaeological program conducted on the Deh Luran Plain of southwestern Iran. Sponsored by Rice University and funded by the National Science Foundation, this program has been


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