List of Articles Salt leaching

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  1 - A Practical Desalinization Model for Large Scale Application
  S. Asadi kapourchal M. Homaee E. Pazira
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  2 - A practical model for reclamation of saline and sodic soils
  Maryam Mohamadzadeh Mehdi Homaee Ebrahim Pazira
  Proper management of saline and sodic soils is essential for optimal conservation of soil and water resources. Accumulation of soluble salts within the root zone is one of the major problems in arid and semi-arid regions. To overcome this problem, leaching of accumulate More

  Proper management of saline and sodic soils is essential for optimal conservation of soil and water resources. Accumulation of soluble salts within the root zone is one of the major problems in arid and semi-arid regions. To overcome this problem, leaching of accumulated salts from such soils is necessary. The most important task in leaching practices is assessment of water quantity required for leaching of saline and saline-sodic soils. Therefore, reliable estimation of the required leaching water quantity is vital for reducing soil salinity to a desirable level. The objectives of this study were to introduce an empirical model to account for reclamation water and to compare the obtained results with some available models. Consequently, a large scale field experiment was conducted in jofeir region at south part of west Khuzestan plains, covering an area of 21285 ha with S3A2 salinity-sodicity classes. The intermittent pounding experiment was conducted with six double ring infiltrometers in a circular array. All experiments were accomplished by applying 100 cm of water in four-25 cm intervals. The leaching water was supplied from Karun rive. Four mathematical models were applied to the collected experimental data to derive a suitable empirical model. The results indicated that the proposed power model with maximum correlation coefficient of 0.83 and minimum standard error of 0.44 can provide reasonable estimates for leaching process compares to the previously proposed models. The results indicated that the empirical relations given by Rajabzadeh (2009), Hoffman (1980) and Laffelar and Sharma (1977) can not resemble the field conditions. However, the empirical relationships introduced by Pazira and Kawachi (1981) and Revee (1957) overestimate the depth of reclamation water. The empirical models of Pazira and Keshavarz (1989), Asadi et al., (2013) and Dieleman (1963) underestimated the depth of required reclamation water compares to the newly proposed model. Manuscript profile
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  3 - Modeling leaching requirement for desalinization of saline soils
  Safoora Asadi Kapourchal Mehdi Homaee Ebrahim Pazira
  Reclamation of saline soils is an important practice from soil and water resources conservation point of view. In saline soils, crop production is adversely affected by soluble salts within the root zone as well as by shallow saline water table. The first step More

  Reclamation of saline soils is an important practice from soil and water resources conservation point of view. In saline soils, crop production is adversely affected by soluble salts within the root zone as well as by shallow saline water table. The first step for reclamation of such soils is reducing the soil salinity to optimum level by capital leaching. Reclamation of saline soils depends on quantity and quality of applied water, as well as soil drainage conditions. The objective of this study was to develop a model to estimate water requirement for reclamation of saline soils based on some obtainable soil physical characteristics. Consequently, a large area of 3,216 ha with S4A3 salinity/sodicity class in Khuzestan, Iran, was selected to obtain the required data. This experiment was conducted with two treatments and two replicates. In the first treatment, the experiment was conducted by applying just 100 cm water depth in four-25 cm intervals. In the second treatment, 5,000 kg/ha Sulfuric Acid was applied prior to salt leaching together with leaching water. The intermittent ponding method was conducted with double rings in a circular array. Soil samples were taken from 0-25, 25-50, 50-75, 75-100, 100-125 and 125-150 cm soil depths before, during and after each leaching water application interval. The required physical and chemical analyses were performed on the collected data. Several mathematical models were applied to the obtained data to verify their performances. The results indicated that the logarithmic model can estimate the capital leaching requirement much than other models. This empirical model with minimum weighted mean of capital leaching water (38 cm) represents the best performance from water saving point of view compares to other models. Manuscript profile