Low quality water for irrigation is necessity to dispose safely but we can impose a major environmental constraint to crop production. Both water quality and irrigation system are the main factors that effect on the yield production and quality. Field experiment was carried out in Research and Production Station, National Research Centre, El-Nobaria district, El-Beheara Governorate, Egypt, during 2015/2016 growing season to study the effect of different types of emitter[Non pressure compensating 1emitter (NPC1), Non pressure compensating 2 emitter (NPC2), and Non pressure compensating 3 emitter (NPC3)]under different irrigation water salinity(345, 2000, 4000 ppm) and different operation pressure heads (0.8, 1.0, 1.2, 1.4 bar) on the plant growth characters, yield and water use efficiency (WUE) of turnip crop(Brassica rapa L)under surface drip irrigation system. The experimental soil is sandy loam in texture.
The obtained results revealed that the highest values of the estimated plant characters were attending at 345 ppm water salinity under all examined emitters. Emitter NPC1 gained the highest yield value (22.28 ton/fed) and NPC3 got the lowest one (19.23 ton/fed), while NPC2 emitter has a superior effect on yield and recorded the highest values which ranged from 27.5; 19.1 ton/fed at 354; 4000 ppm and 12.99, 8.22 kg/m3, respectively, while Emitter NPC1 gained the highest yield value (22.28 ton/fed) and NPC3 got the lowest one (19.23 ton/fed) with difference 16 %, while NPC2 recorded the highest water use efficiency, WUE (10.8 kg/m3). WUE for examined emitters NPC2 had a positive effect and recorded increase about 14.5% (NPC1) and 17.4 % (NPC3). The rate of reduction in yield and WUE relative to salinity were 20 and 35 % for irrigation water salinity 2000 and 4000 ppm relative to control one (345 ppm).
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