MODIFICATION OF WATER APPLICATION UNIFORMITY AMONG CLOSED CIRCUIT TRICKLE IRRIGATION SYSTEMS

Document Type : Original Article

Authors

1 Department of Water Relations and Field Irrigation, National Research Center, Dokki, Giza, Egypt.

2 Department of Soil, Plant and Agricultural Systems, University of Southern Illinois, USA.

3 Department of Agricultural Engineering, Faculty of Agriculture, Ain Shams University, Cairo, Egypt.

Abstract

The aim of this research was determine the maximum application uniformity of closed circuit trickle irrigation systems designs. Laboratory tests carried out for Two types of closed circuits: a) One manifold for lateral lines or Closed circuits with One Manifold of Trikle Irrigation System (COMTIS); b) Closed circuits with Two Manifolds of Trikle Irrigation System (CTMTIS), and c) Traditional Trikle Irrigation System (TTIS) as a control. Three lengths of lateral lines were used, 40, 60, and 80 meters. PE tubes lateral lines: 16 mm diameter; 30 cm emitters distance, and GR built-in emitters 4 lph when operating pressure 1 bar. Experiments were conducted at the Agric. Eng. Res. Inst., ARC, MALR, Egypt. With COMTIS the emitter flow rate was 4.07, 3.51, and 3.59 lph compared to  4.18, 3.72, and 3.71 lph with CTMTIS and 3.21, 2.6, and 2.16 lph with TTIS (lateral lengths 40, 60, and 80 meter respectively). Uniformity varied widely within individual lateral lengths and between circuit types. Under CTMTIS uniformity values were 97.74, 95.14, and 92.03 %; with COMTIS they were 95.73, 89.45, and 83.25 %; and with TTIS they  were 88.27, 84.73, and 80.53 % (for lateral lengths 40, 60, 80 meter respectively). The greatest uniformity was observed under CTMTIS and COMTIS when using the shortest lateral length 40 meter, then lateral length 60 meter, while the lowest value was observed when using lateral length 80 meter this result depends on the physical and hydraulic characteristics of the emitter and lateral line. CTMTIS was more uniform than either COMTIS or TTIS. Friction losses were decreased with CTMTIS in the emitter laterals at lengths 40 meter compared to TTIS and COMTIS. Therefore, differences may be related to increased friction losses when using TDIS and COMDIS.

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References

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