Salinity Status of Soils of Irrigated Lands and Irrigation Water Quality at Raya Alamata District, Northern Ethiopia
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- Salt Affected Soil Classes, Irrigation Water Quality, Soil Properties
- Hailu, Birhane; Wogi, Lemma; Tamiru, Solomon
- Information about salinity/sodicity status of soils and irrigation water quality plays a vital role for proper management of irrigated fields. Studies on salinity/sodicity status and irrigation water quality were conducted during 2016 at RayaAlamata District at Two sites (Tumuga and Gerjale) with the objectives to characterize the salinity/sodicity status of soils of irrigated lands and irrigation water quality. Based on the field reconnaissance survey, sampling units for surface and profile soil samples as well as irrigation water were identified.Accordingly, irrigated surface and profiles soils, and irrigation water samples were collected using systematic sampling. Samples were analyzed for theirsalinity/sodicity indicators and irrigation water quality parameters. The magnitude of the exchangeable cations in all sites were in the order of Ca> Mg> Na > K.All sites were within the range of moderate to very high and very high with respect to PBS and CEC respectively. Soluble cations (Ca2+and Na+ ) and anions (SO42- and Cl- )were dominant.Residual sodium carbonate of the irrigation water indicated that, 85.71% and 87.50% were suitable and 14.29% and 12.50% were not suitable for irrigation purposeat Tumuga and Gerjale sites, respectively. Considering agricultural purposes, the electrical conductivity values for the surface soils indicated that only a small portion of the total irrigated area was classified as saline soil, whereas it was below the threshold level throughout the soil profiles to qualify for the salt affected soil classes in both sites of the study area. Continuous assessment and monitoring to avoid the possible occurrence of soil and irrigation water salinity/sodicity should be followed in both sites of the irrigated areas.
Full text: IJRAS_866_FINAL.pdf