Evaluation of factors affecting emitter clogging of microirrigation in southeast Iran
2002
Sanij, H.D. (Tottori Univ. (Japan)) | Taherpour, M. | Yamamoto, T.
In microirrigation systems the emitter clogging can adversely affect the uniformity in irrigation water application, thereby increasing irrigation requirement, and decreasing the irrigation water use efficiency. We investigated the impact of selected water quality attributes (chemical) and the duration of the irrigation system in use (long and short period) on (i) emitter clogging and (ii) uniformity of water distribution in microirrigation systems. Field experiments were conducted in eleven farms, equipped with microirrigation system, in Rafsanjan and Jahrom sub-provinces in Southeast Iran. In Rafsanjan, the emitter clogging was induced primarily by calcium carbonate content in irrigation water and to a lesser extent by calcium sulfate. On the other hand, an opposite trends was observed in the Jahrom irrigation system. In general, clogging in Jahrom irrigation systems was higher than in Rafsanjan. The pH of the irrigation water used in Rafsanjan irrigation systems was higher than that in Jahrom. The field performance index ""coefficient of emitter discharge variation (W subq1)h seems to be more sensitive and reliable, for assessing clogging severity, than uniformity coefficient (U subc) or emission uniformity coefficient (E subu). Emission uniformity coefficient in the irrigation systems in operation for short period was higher, E subu>80%, than those in operation for long period, E subu<66%.
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