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University of Glasgow (2015)

Water quality problems in irrigated agriculture in Libya

Aboeltiyah Alzway, Aiad A. Akhreim

Titre : Water quality problems in irrigated agriculture in Libya

Auteur : Aboeltiyah Alzway, Aiad A. Akhreim

Université de soutenance : University of Glasgow

Grade : Doctor of Philosophy (PhD) 2015

Résumé partiel _ The Kufra region of south eastern Libya comprises an area about 850 km south to north, and some 500 km wide rising to 450 m above sea level. Rainfall is low and agriculture depends on irrigation. Most of the population of Kufra are private farmers who use flood irrigation from shallow wells (19-60 m), but there are co-operatives of farmers that have shared the cost of deeper wells (120 - 150 m) and sprinkler irrigation. The Kufra Agricultural Project (KAP) state farm is made up of 100 circles (farms) each having its own deep well (220 – 352 m) and rotary sprinkler.

The experimental work was conducted in three phases. An initial study was made of soil profiles and irrigation water on 4 private and 4 state farms. An inter laboratory study compared results in the KAP and Glasgow University (GU) laboratories. The third phase was a survey of top soils, irrigation water, crop yield and questionnaires for a much larger number of farms.

Chapter 3 describes the comparison between chemical analysis results of 33 soils in the KAP and GU laboratories. There was a good level of agreement between the two laboratories. The high correlation coefficients indicate a high level of precision in both laboratories. However there were systematic differences between the two laboratories, results for EC, Ca2+, Mg2+ and Cl- were 2% to 6% lower in the KAP laboratory. There were no significant differences in the results for Na+ and K+ between the laboratories. It is important that all analyses were carried out in one laboratory, so all subsequent samples were sent to the KAP laboratory.

Chapter 4 evaluates the quality of irrigation water from 86

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