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IN SITU SOLUTE TRANSPORT OF CL AND NA AND UNSATURATED HYDRAULIC CONDUCTIVITY OF SOIL UNDER SALINE IRRIGATION WATER+ | ||
| AL-TAQANI | ||
| Article 1, Volume 26, Issue 1, 2013, Pages 0-0 | ||
| Author | ||
| Ramzi M. Shihab | ||
| Abstract | ||
| Transport of Cl and Na solutes were predicted by convection-dispersion equation (CDE) and its relations with unsaturated hydraulic conductivity, K(Ɵ) under saline irrigation water. Three field plots were irrigated with seven intermittent pounding of saline water. During irrigation, samples of soil solution were collected at depths of 0.15, 0.30, and 0.45 m and EC , Cl and Na were being measured. The K(Ɵ) was measured using internal drainage method, utilizing neutron probe and tensiometers. Results showed that the shape and position of breakthrough curves (BTC) of Cl and Na were differed due to type of ion and soil water characteristics. The BTC of Cl and Na were displaced to the right and Na showed less relative concentration (C/Co) at a given pore volume (V) of water. The CDE provided a fairly good fit to the BTC for both ions. It gave dispersion coefficient (D) of 177.6 cm2 day-1 for Cl and 120-237.6 for Na. Also, Cl and Na curves appear more C/Co at 0.15 m depth in comparison with the other two depths. The fitted exponential curve of K(Ɵ) showed in general a decreased in magnitude with the use of saline water. The values ranged from 0.02419 to 0.00188 , and 0.01425 to 0.00120 cm h-1 for fresh and saline water, respectively. | ||
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