الفهرس | Only 14 pages are availabe for public view |
Abstract Up to day, drip irrigation systems have reached to a high level of technology. But, these systems are not able to show their potential benefits, due to various reasons. Emitter clogging can affect on distribution uniformity and the system performance, which has direct relationship with water quality. In this study three types of emitters (pressure compensating, long path and turbo key) with nominal discharges 4, 6 and 8 L.hr-1 respectively which were tested under three types of water (Nile, drainage and fertilized water) with operating pressure (75, 100, 125, 150 kPa) at spacing of 50cm and six laterals of 16mm diameter at spacing 75 cm and 10m length for each lateral line. Drip irrigation system was constructed in Agri. Eng. Dept; faculty of agriculture Menoufia University. The research aims to evaluate three types of emitters have changing type and quality of water and operating pressure based on hydraulic parameters , emitter clogging percent%, accumulative clogging percent% and rate of accumulative clogging/hr. All the last items were conducted to select the best emitter performance for each water type by the effect of operating period. The results showed that turbo key emitter is the best at all studied items for example after 181 hr of operating period; (1) Nile water at 100 kPa, clogging percent is (8.12, 16.72, and 30.00%) for turbo key, long path and pressure compensating respectively. (2) Drainage water at 100 kPa, clogging percent is (12.24, 21.33 and 70.75%) for turbo key, long path and pressure compensating respectively. (3) Fertilized water at 100 kPa, clogging percent is (11.38, 19.12 and 34.50%) for turbo key, long path and pressure compensating respectively. Increasing the operating pressure led to remove deposits outside the emitter and the clogging percent decreased, as occurred with turbo key emitter. Both of water quality and emitter type play an effective role in maintaining drip irrigation system efficiency for a long time. |