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    Emitter clogging and effects on drip irrigation systems performances
    (Academic Journals, 2010) Yavuz, Muharrem Yetis; Demirel, Kursad; Erken, Okan; Bahar, Erdem; Deveciler, Merve
    Emitter clogging is one of the most important factors that affect the performances on drip irrigation systems. Emitter clogging, which is formed in a short time due to irrigation systems' running under an inadequate pressure or owing to water quality, not only negatively influences uniformity of water distribution but also causes inadequate irrigation. In this survey, the clogging level determination of the emitters used in drip irrigation systems of some agricultural farms situated in Canakkale and their effects on irrigation performances were observed. The emitters were obtained from different farms in the investigated area, and were tested under the pressures of 50, 100, 150, 200, 250, 300 kPa in hydraulic laboratories. The clogging extend of emitters, flushing of clogging increased pressure and also performance values as coefficient of variation (Cv) under 100 kPa pressure, statistical uniformity (Us), emission uniformity (Eu) and Christiansen's uniformity coefficient (Cu) were established through the tests. Acquired performance values must be matched with emitter performances that have not been used in irrigation. As a result of the study it was determined that some emitters are plugged on laterals used for 2 or 3 years in consequence of the tests. It as also determined that emitter coefficient of variation varied in the ranges of 0.43 and 0.63, 0.43 and 0.69, 0.48 and 0.58, 0.56 and 0.73 for unused emitters, for one year, for two years and for three years used emitters. Coefficient of variation between emitter flows remained within the limit of 5% in all laterals, except for one of the laterals used for one year. Coefficient of variation of emitters along two of the laterals used two years and all of those used three years remained out of 5% limitation. Similar results to CVm (manufacturing variation coefficient) were determined for performance parameters in respect of statistical uniformity (Us), emission uniformity (Eu) and Christiansen's uniformity coefficient (Cu).
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    Irrigation water management for sprinkler irrigated corn using rooting data obtained by the minirhizotron technique
    (2012) Yavuz, Muharrem Yetis; Çakir, Recep; Kavdir, Yasemin; Deveciler, Merve; Bahar, Erdem
    The research, aiming to evaluate possibilities for irrigation scheduling of corn using root development data obtained by minirhizotron technique, was carried out during 2008 and 2010 on experimental fields belonging to Çanakkale Onsekiz Mart University. Line source sprinkler irrigation was applied for irrigation of the experimental plots and irrigation water amount determination was based on water deficits of the actual effective root depth obtained prior to the irrigation application using the minirhizotron technique. Results of the 2 year study show that the effective root depth of the crop is around 70-75 cm until the 3 rd or 4 th irrigation application. Using data for root development restricted overwatering and excessive water loss compared to 90 cm root depth traditionally assumed for corn irrigation in the region. The highest grain yields were obtained from the treatment under favorable moisture conditions and yield decreased with increasing distance from the sprinkler irrigation lateral. There a linear relationship between seasonal evapotranspiration rates and grain yield, and seasonal evapotranspiration deficit and relative yield reduction, during each of the experimental years. Average value of the yield response factor (ky) for the research period was 1.34. © 2012 Friends Science Publishers.
  • [ X ]
    Öğe
    Irrigation Water Management for Sprinkler Irrigated Corn using Rooting Data Obtained by the Minirhizotron Technique
    (Friends Science Publ, 2012) Yavuz, Muharrem Yetis; Cakir, Recep; Kavdir, Yasemin; Deveciler, Merve; Bahar, Erdem
    The research, aiming to evaluate possibilities for irrigation scheduling of corn using root development data obtained by minirhizotron technique, was carried out during 2008 and 2010 on experimental fields belonging to Canakkale Onsekiz Mart University. Line source sprinkler irrigation was applied for irrigation of the experimental plots and irrigation water amount determination was based on water deficits of the actual effective root depth obtained prior to the irrigation application using the minirhizotron technique. Results of the 2 year study show that the effective root depth of the crop is around 70-75 cm until the 3rd or 4th irrigation application. Using data for root development restricted overwatering and excessive water loss compared to 90 cm root depth traditionally assumed for corn irrigation in the region. The highest grain yields were obtained from the treatment under favorable moisture conditions and yield decreased with increasing distance from the sprinkler irrigation lateral. There a linear relationship between seasonal evapotranspiration rates and grain yield, and seasonal evapotranspiration deficit and relative yield reduction, during each of the experimental years. Average value of the yield response factor (ky) for the research period was 1.34. (C) 2012 Friends Science Publishers