Prognostication of the quantity of reclamation water requirement for salt leaching of problematic soils via empirical simulation models in South of Iran

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Research Paper 01/10/2014
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Prognostication of the quantity of reclamation water requirement for salt leaching of problematic soils via empirical simulation models in South of Iran

Amirpouya Sarraf, Azita Behbahaninia
J. Bio. Env. Sci.5( 4), 60-64, October 2014.
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Abstract

Study area called “Mianab – Shushtar” is located in the middle part of the Khuzestan province, Iran. Soil survey and land evaluation conducted in the area should that from the total area of about 41855 ha, almost over 14100 ha (33.7%) faced with the problem of salinity/or salinity and sodicity, with different levels. In order to determine the possibility of their desalination and desodification, 6 experiments of salt leaching with a depth of 1.0 meter in 4 intervals of 0.25 m water application were done in the same area. Soil samples were taken before, during and after each dose of leaching water application .The collected samples sent to the laboratory to be analyzed. The source of applied water was from the Karun River, which can be considered as suitable, according to USSL (1954). Data obtained from soil and water analysis in the leaching experiments, were treated by making use of different softwares such as SPSS and Curve Expert. Results showed that reclamation of the soils of the study area seems to be possible and there is no need to use any chemical amendment in this sense. Also detail studies created a new empirical mathematical relationship for estimating the amount of reclamation water requirement, and prediction of the final soil salt salinity or final soil sodicity (ESP). As a result it was concluded that if some type of drainage system (open or subsurface) is installed with optimum distance and depth and also leaching practices with appropriate water depth is carried , there is a good possibility for physic-chemical reclamation of the soils in the study area. As there are rich source of natural calcium in the soils and in applied irrigation water, it seems that no special problem is expected.

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