DIFFERENTIAL SALT LOADING OF ON-SITE DRAINAGE WATER AND ASSOCIATED SALT BALANCE | ||||
| Journal of Soil Sciences and Agricultural Engineering | ||||
| Article 11, Volume 32, Issue 12, December 2007, Page 10783-10797 PDF (145.65 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jssae.2007.201624 | ||||
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| Author | ||||
| E.A. El-Naka | ||||
| Soil Science Department, Faculty of Agriculture, El-Zagazig University. | ||||
| Abstract | ||||
| Monitoring of salt loading in soils and water is important to avoid salt accumulation and their subsequent degradation. A field experiment was implemented in two sites in the EL-Zagazig Country, each with workable subsurface drainage network. Maize and wheat were grown in sequence under conventional management procedures. Emitted drainage effluents in the manholes were sampled for volume and chemical determination. The results indicate that EC, SAR, and ion concentrations increased as a function of time, sometimes bye a factor of 4, due to diminution of emitted water. In most cases, Na was the most dominantion due to feeble reactions with the exchange complex. Bivalent Ca, Mg, and SO4 were closely affiliated to exchange, precipitation, and dissolution reactions. A considerable amount of salt was flushed out of the two fields during the growing season of maize followed by wheat. The total net salt balance of the two sites is negative, indicating that the soils have lost some of their initial salt content in an adventitious leaching process during irrigation. It is recommended that an integrated management of irrigation and subsurface drainage systems should be considered within a systemic approach to provide for the viable and sustainable agricultural production. | ||||
| Keywords | ||||
| salt balance; salinity; sodicity; subsurface drainage | ||||
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