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sur le développement des zones arides et semi-arides

Titre : Effects of Rainwater Harvesting Techniques on Establishment, Growth and Survival of some Multipurpose Tree Species Transplants on Dry land in South Darfur State, Sudan

Auteur : Adam ZaKria Abdalla Omer

Université de soutenance : University of Khartoum

Grade : Master of Science in Forestry (Silviculture) 2020

Résumé partiel
The study was conducted in Nyala Agriculture Research Station farm South Darfur state during July 2018 to August 2019.The study aimed to assess and test the effects of water harvesting techniques for establishment and survival of some tree transplants namely Acacia senegal, Ziziphus spina-christi and Grewia tenax ; to assess the influence of it on soil moisture content ; to screen appropriate techniques that ensure the best establishment of tree species and to investigate information and knowledge local practice on agricultural crops and tree cultivation . Four water harvesting techniques were tested namely control, semicircular bund, trapezoidal bund and V-shape catchment. The experiment was arranged in Design (RCBD) with 6 blocks as replications. The following stat was measured ; survival rates, heights, diameters and number of branches. Root measured at the end of the second season after excavating the transplants. Soil moisture contents within water harvesting techniques were measured from three depths, 0-20, 20-40 and 40-60 cm, three times during the trials period. Social surveys were conducted by questionnaires a total number of 300 respondents as sample size and using purposive sampling technique random track in the study area and 50 farmers for tract. The results of soil moisture content at three depths of soil for three species ware recorded only in 5% starting point and at depth 0-20cm(17.3 ,15.6,14.6 and13.9 %) , depth 20-40cm ware recorded(17,15.4,15 and 6.3 %) and depth 40-60cm in trapezoidal bund, V-shape, semicircular and in control respectively . Trapezoidal bund was the best for collecting and preserving water than V-shape catchment, semicircular compared to control. The survival rate results for all species in the second season were recorded for A. senegal (75, 66.7, 66.7 and 50%) then for Z. spina-christi (75, 66.7, 58.3 and 25%) and for G. tenax (66.7, 58.3, 58.3 and 41.7%) in trapezoidal bund, semicircular bund, V-shape catchment and control, respectively.

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