كليدواژه :
يكنواختي پخش , قطره چكان , آب شور , گرفتگي
چكيده لاتين :
Emitter clogging is a serious problem in trickle irrigation systems, which can increase Operating costs, water application rate, water distribution uniformity and farmerʹs confidence in the system can be affected. Also in different regions of country such as Kerman province large amount of groudwater is saline and brackish and recently, due to extra extraction, the water quality is decreasing speedly.The experiment was conducted in Kerman province for 9 months between 2003-4 years on a land 8 x 25 m which consisted of 5 rows of 20 m. Each row had 50 emitters and water electrical conductivity (EC) was 8 dS/m. In this study, the relative resistance of different type of emitters (Inline, Microflapper, Online, Turbo, and tape) to clogging was evaluated when using saline irrigation water. Emitter mean discharge, emission uniformity (EU), Christiansen coefficient of uniformity (CU), and manufacturerʹs coefficient of variation of emitters (Cv) were calculated during the experiment. According to findings: The clogging was 2% for Inline and Microflapper emitters but Online, Turbo and Tape emitters had 10%, 18% and 68% clogging respectively. The clogging of emitters and their discharge dispersion caused a decrease in emitter mean discharge, EU, CU and an increase in Cv during the experiment. The relative comparison of emitters showed that Online, Turbo and Tape emitters were significantly affected by saline water, so, they can not be suggested for irrigating with salin water. Therefore, Microflapper and Inline emitters along with good management were suggested when facing on saline irrigation water.
