Plant Soil Environ., 2008, 54(1):20-29 | DOI: 10.17221/2780-PSE

Effects of leaching on soil desalinization for wheat crop in an arid region

B. Mostafazadeh-Fard1, M. Heidarpour1, A. Aghakhani1, M. Feizi2
1 Department of Water Engineering, Isfahan University of Technology, Isfahan, Iran
2 Isfahan Agricultural and Natural Resources Research Center, Isfahan, Iran

Leaching is one of the most practical methods for improvement of saline soils and both the quality and the quantity of leaching water play an important role in desalinization of these soils. To determine the effects of different qualities and quantities of leaching water on salinity of drainage water during the growing season of wheat, pot experiments were conducted with a silty clay loam soil, a typical salt-affected soil in an arid region of central part of Iran. The experiment comprised the treatments of three irrigation water salinities (4, 9 and 12 dS/m) and four leaching levels (3, 20, 29 and 37%), using a factorial design with seven replications for each treatment. The results showed that at the beginning of the growing season the drainage water salinity was highest for all treatments. Then it started to decrease and depending on the quality and quantity of leaching water it became nearly constant or continued to decrease until the end of the growing season. The leaching of salts from the soil profile was more efficient during the first few irrigations and thereafter became less efficient. The increase of leaching level had a significant effect on the decrease of drainage water salinity. The comparison with steady-state mass balance of soil salt, sodium and chloride showed that the simple ratio of chloride in irrigation water to chloride in drainage water can be used to estimate the leaching fraction of saline soils with high accuracy.

Keywords: irrigation water quality; drainage water quality; leaching; wheat

Published: January 31, 2008  Show citation

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Mostafazadeh-Fard B, Heidarpour M, Aghakhani A, Feizi M. Effects of leaching on soil desalinization for wheat crop in an arid region. Plant Soil Environ. 2008;54(1):20-29. doi: 10.17221/2780-PSE.
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