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University of Reading (2000)

Modelling the development of soil salinity on small farms in Oman growing irrigated crops using saline groundwater

Al-Ajmi, Asadullah

Titre : Modelling the development of soil salinity on small farms in Oman growing irrigated crops using saline groundwater.

Auteur : Al-Ajmi, Asadullah.

Université de soutenance : University of Reading

Grade : Doctor of Philosophy (Ph.D.) : 2000

Résumé
During 1998-1999, field work was carried out in 38 small farms in the Batinah region, Oman, to model the development of soil salinity. Water was supplied by irrigation using groundwater of highly variable salinity depending on the location. The crops were either trees (date palm, mango and lime) irrigated individually in circular basins with diameters of 1.4-4 m or flood irrigated forage crops (lucerne and Rhodes grass). Soil water salinity in the top soil (0-30-cm depth) varied from less than 2 to more than 50 dS/m. An irrigation management model (IMAGE) was developed. This model made good predictions of soil water salinity, with 75% of locations being predicted to within 2.5 dS/m. Poor model prediction was associated with sites with large data uncertainties or with factors such as highly permeable soils causing large within-basin heterogeneity in infiltration and drainage. Sensitivity analyses were used to show that there is scope for controlling soil water salinity through optimizing irrigation scheduling and the size of irrigation basins relative to the size of the tree canopy

Mots clés : Date ; Mango ; Lime ; Alfalfa ; Rhodes ; Salinisation Soil science Agronomy Plant diseases Horticulture Agricultural engineering Soil science Agronomy Agricultural engineering

Annonce : EThOS (UK)

Présentation (CABI)

Page publiée le 4 juin 2009, mise à jour le 21 janvier 2018