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A NEW APPROACH FOR SOIL SALINITY CONTROL BY STOPPING THE ASCENDING MOVEMENT OF WATER IN THE SOIL

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  032238,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.13811) @2003
Authors:   ALIREZA GUITI
Keywords:   Soil, water, salinity, evaporation, capillary rise, electrical conductivity, leaching, soluble salts, asphalt, ground water, isogum, rubber

Salts are present in irrigation waters in relatively small but significant amounts. They are carried by the water to wherever it is used. In the cases of irrigation, salts are applied with the water and remain behind in the soil as water evaporates or is used by the crop.

The capillary rise is one of the most important parameters of soil salinization.

We have proposed and experienced a method where the basic principle is to interpose a perforated impermeable layer with plenty of holes, sandwich between two layers of fine gravel, in a suitable depth of soil. With the help of such a layer, the capillary rise will be stopped, while down-movement of water continues. So, the salt accumulation in the surface soil will be avoided.

The field and pot experiments showed the effectiveness of the proposed method. Considerable water economy and soil salinity control could be reached. Different impermeable layers should be tested to clear the sustainability of this method and its economic aspects.

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