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Assuit University (2015)

Irrigation strategies for saving water and maximizing the productivity with modern irrigation systems

Al-Rejal, Najib Abdullah Ahmed Abou

Titre : Irrigation strategies for saving water and maximizing the productivity with modern irrigation systems

Auteur : Al-Rejal, Najib Abdullah Ahmed Abou

Etablissement de soutenance : Assuit University

Grade : Doctor of Philosophy (PhD) in Agricultural Sciences 2015

Résumé
The present work was carried out at the Agricultural Experimental Station of soil and water Department‚ Faculty of Agricultural‚ Assiut University‚ situated at 27 0 11’N latitude‚ 310 10’E longitude The aims of this study were :1- To study the effects of irrigation systems surface drip irrigation, subsurface drip irrigation and modified surface irrigation on potato and maize production under the conditions of different deficit irrigation strategies. 2 : To determining the best water deficit level for potato and maize production to save irrigation water using the subsurface drip irrigation, surface drip irrigation system and modified surface irrigation system and 3 : To study the effects of deficit irrigation strategies on IWUE of potato and maize crops. To achieve such goals field experiments were carried out :- * The first experiment was carried on potato in the winter seasons of 2011/2012 with sub surface drip irrigation (SSDI) and surface drip irrigation (SDI) * -The second experiment was run using maize during the summer season of 2012 with sub surface drip irrigation (SSDI), surface drip irrigation (SDI), and modified surface irrigation system (MSI). * -The third experiment was carried out using potato in the winter season of 2012/2013 with sub surface drip irrigation (SSDI), surface drip irrigation (SDI), and modified surface irrigation system (MSI)..* The fourth experiment was run using maize during the summer season of 2012 with sub surface drip irrigation (SSDI), surface drip irrigation (SDI), and modified surface irrigation system (MSI). *The first and second experiments continues deficit irrigation levels (CDI) with four different deficit irrigation levels were applied. The levels were full irrigation (100%ETc), 85% of full irrigation (85%ETc), 70% of full irrigation (70%ETc) and 55% full irrigation (55%ETc) treatments.. *The third and fourth experiments were for application regulated deficit irrigation (RDI)which imposed with four different stages along growth season as four treatments (T1, T2, T3 and T4). For potato regulated deficit irrigation experiments, [(T1, T2, T3 and T4) at (26 -47, 48 - 70, 71 - 92 and 93 -113 days from planting)], respectively. For maize regulated deficit irrigation strategies experiments, [(T1,T2,T3 and T4) at (19-38, 39 -60, 61-80 and 81- 101 days from planting)], respectively. A randomized complete block design with four replications in strip was used. Irrigation water amount of I100 treatment was calculated from reference evapotranspiration (ET0). Irrigation water amount of 100%ETC treatment for all experiments was calculated determined using the CropWat computer program and the recorded climatic parameter of the Assiut metrological station. The water amounts of the other treatments were calculated by using the corresponding percentages of deficit (85%, 70% and 55%) based on the water amount of 100% treatment for CDI potato2011/2012 and CDI maize 2012 experiments .And were calculated by using the corresponding percentages of deficit (80%) based on the water amount of 100% treatment for RDI potato2012/2013 and RDI maize 2013 experiments. Soil moisture distribution was measured using the gravimetric methods. Also, Soil moisture tension was measured with the WatermarkR sensor.

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Page publiée le 6 janvier 2016, mise à jour le 5 février 2019