SIMULATION OF SOIL SALINITY DISTRIBUTION UNDER DRIP IRRIGATION WITH DIFFERENT WATER SALINITY
DIYALA JOURNAL OF ENGINEERING SCIENCES,
Volume 10, Issue 4, Pages 87-100
AbstractUsing saline water has been widely used in irrigation to address the scarcity of fresh water and it's inadequacy for different uses. Hydrus-2D was used to simulate the movement of salts under a surface drip source with four irrigation systems, included, water salinity percentages (50%, 100%) with actual drip discharge (3.94 l/hr and 7.88 l/hr) in the root zone of potato crop. it is initially assessed on the basis of a field study conducted, in Saqlawiyah, during spring season of 2010. A simulation domain was designed, according to spacing between drips, with group of observation points; to monitor salinity distribution, 1 day after irrigation at the end of each growing stages of potato crop. The results showed, a fairly good agreement between measured electrical conductivity for soil samples and those simulated with Hydrus-2D, at all stages of potato growth. A decrease in soil salinity was shown with irrigation systems using, actual drip discharge of 3.94 l/hr. Salinity gradually increased with potato growth development, and increasing salt water utilization rates in irrigation. Hydrus-2D can be considered as an effective tool for predicting of content of salinity distribution in the root zone, under surface drip irrigation. .
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