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Design and management of modified pivot irrigation system [electronic resources].

By:

Abdel-Rahman, M. E

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Language: English Summary language: Arabic Description: p.415-432Other title:

تصميم و إدارة نظام ري محورى مطور.‪‪‪ [Added title page title]

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Annals of agricultural science, 2005 v. 50 (2) [electronic resource].

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In: Annals of Agricultural Science 2005.v.50(2)Summary: The main objectives of this study are to modify pivot irrigation system to be more suitable to irrigate trees, and other crops under special conditions, to evaluate the modification system and to reduce the investment costs of the modified system. Center pivot modification depends on replacing the sprinkler heads (sprayers) by polyethylene hoses ending by nozzles. Field experiments were conducted at the Experimental Farm of Faculty of Agriculture, Ain Shams University, to modify sprinkler pivot to work as a moving surface irrigation system. Two different nozzle shapes were selected (trapezoid and triangle) with two different hoses length (25 and 200 cm). Pilot area was divided into two halves; the first was straight furrows, while the second was round furrows as well as concentrated with track of pivot wheels. Maize crop was planted under pivot system. Results showed that the modified pivot system was operated at low pressure head (1.95 bar), irrigation water was decreased by (16.8%) compared to sprinkler pivot system, the uniformity coefficient for triangle form was 91.6%, pulled hoses (200 cm) were better than the short hoses. On the other hand, water: use efficiency with modified pivot system was (2.5 kglm3), while it was (1.84 kglm3) with sprinkler pivot system and the modified pivot system reduced the hazard of chemigation. The investment cost of the modified system was reduced compared with sprinkler pivot system with little energy required for the modified pivot system. There's no significant difference between the two methods of furrow on grain yield of maize.

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The main objectives of this study are to modify pivot irrigation system to be more suitable to irrigate trees, and other crops under special conditions, to evaluate the modification system and to reduce the investment costs of the modified system. Center pivot modification depends on replacing the sprinkler heads (sprayers) by polyethylene hoses ending by nozzles. Field experiments were conducted at the Experimental Farm of Faculty of Agriculture, Ain Shams University, to modify sprinkler pivot to work as a moving surface irrigation system. Two different nozzle shapes were selected (trapezoid and triangle) with two different hoses length (25 and 200 cm). Pilot area was divided into two halves; the first was straight furrows, while the second was round furrows as well as concentrated with track of pivot wheels. Maize crop was planted under pivot system. Results showed that the modified pivot system was operated at low pressure head (1.95 bar), irrigation water was decreased by (16.8%) compared to sprinkler pivot system, the uniformity coefficient for triangle form was 91.6%, pulled hoses (200 cm) were better than the short hoses. On the other hand, water: use efficiency with modified pivot system was (2.5 kglm3), while it was (1.84 kglm3) with sprinkler pivot system and the modified pivot system reduced the hazard of chemigation. The investment cost of the modified system was reduced compared with sprinkler pivot system with little energy required for the modified pivot system. There's no significant difference between the two methods of furrow on grain yield of maize.

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