الفهرس 
Definitions and adaptabilityOnly 14 pages are availabe for public view
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Abstract
Performance of different irrigation equipment (Design and performance of lateral lines in drip irrigation system) With a continuous increase of the problem of food shortage in the world and the limited water resources, tlle irrigation system is increasingly important enough and stable agiicultural production. The main reason for irrigating crops is to supply water from its natural sources, such as rainfall, dew, ground water, and melting snow. Irrigation is needed in areas where water from natural sources is adequate for crop production during only a part of the year or is sufficient for some years and not for others. The amount and timing of irrigation depend on several climatic conditions, soils, and crop factors. When a reliable and a suitable supply of water becomes available for agriculture, it can result in vast improvements in agricultural production and assure economic returns. Two primary objectives of irrigation in arid areas of the world are: 1) To supply the essential moisture for plant growth, which includes the transport of fundamental nutrients. 2) To leach or dilute salts in the soils. In addition to the previous objectives, it provides a number of side benefits, such as cooling the soil and the atmosphere to create a more favorable eiivironment for plant growth. There are a large number of considerations which must be taken into account in the selection of an irrigation system. These factors will vary in importance from location to location and crop to crop. They include the foll0willg:- a) Topography, soil depth, texture, structure, and climate; b) Crop characteristics; C) Size and type of water resource;, quality of water, depth and quality of ground water; d) The relative cost of irrigation equipment; e) Land preparation and labor; f) The cost of credit; g) The availability and sliill of farm labor.