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Articles by H. Dehghanisanij
Total Records ( 1 ) for H. Dehghanisanij
  H. Dehghanisanij , T. Yamamoto , M. Inoue and M. Akbari
  The scarcity of fresh water in arid and semi-arid regions (ASAR) makes saline water a valuable alternative water source for irrigation of agriculture crops, if we can improve the management of saline water to avoid its deleterious effects. Variables affecting soil water content (θw) and soil solute salinity (ECw), including time after irrigation and crop growth stages; early (ES), mid (MS) and late (LS) stages, were investigated at different radius from the emitter (lateral pipe). The simultaneous distribution of water and solute under drip irrigation was measured using Time Domain Reflectometry (TDR) method. The results indicated that θw and ECw increased in the order ES < MS < LS. The maximum θw and minimum ECw coincided at 10 cm radius from emitter (r10) during ES, MS and LS. The same trend applied for 20 cm radius from emitter (r20) during ES and MS. The ECw increased significantly in the order r10 < r20 < r30 during all crop growth stages. Time elapsed since irrigation was terminated till θw increased to a maximum level at the r10, during ES, MS and LS was 4, 3 and 3 h, respectively. It is therefore suggested that irrigation should commence 3 h before noon to coincide the maximum θw (minimum ECw) with maximum crop evapotranspiration (ETc). Interaction between θw and ECw for a given radius and different crop growing stages showed that the influence of θw on ECw was restricted to a small radius of about 20 cm from the emitter, which decreased further to only 10 cm during LS. Beyond this range, increasing θw was not enough to significantly affect ECw. The information obtained from this research is essential for the design, operation and management of saline water use with drip irrigation system in sand dune fields.
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