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Sultan Qaboos University (2017)

Water conservation, plant growth, and microbial counts of block crack capillary barrier having different sand to fine texture soil proportions

Al-Harrasiyah, Nadhira Salim Sulaiman

Titre : Water conservation, plant growth, and microbial counts of block crack capillary barrier having different sand to fine texture soil proportions

Auteur : Al-Harrasiyah, Nadhira Salim Sulaiman

Université de soutenance : Sultan Qaboos University

Grade : Master of Science (MS) in Soil and Water Management 2017

Résumé partiel
In Oman, like other arid-zone countries, there is a growing need for a thrifty and efficient usage of water resources for agriculture due to water scarcity. One of the approaches to achieve such a goal in saving water is to use capillary barriers (CB), CB occurs at the interface of two soil layers having distinct textural and hydraulic characteristic. In this study, a "nature-inspired capillary barrier design” called hereafter as Smart Capillary Barrier (SCB) was mimicked in a soil column. Specific objectives of this study were to investigate the effect of (i) changing sand to silt loam ratio of the SCB to enhance water storage capacity of the surrounding fine textured (silt loam) soil of the blocks and (ii) using different sand to silt loam proportions of the SCB on the growth of an okra [Abelmoschus esculentus (L.) Moench) and the soil microbial count under deficit irrigation conditions. Three proportions of sand to silt loam soil on a volume basis were used in this study including 25:75%, 50:50% and 75:25%. Soil column experiments were conducted using okra plant at the Agriculture Experimental Station (AES), Sultan Qaboos University, Oman, during the period from October 2016 to March 2017 in an open field. Furthermore, the efficiency of SCB in conserving water was validated by pot experiments that were conducted on June 2017.

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