http://ir.bdu.edu.et/handle/123456789/14025 Sat, 13 Jan 2001 05:49:26 GMT 2001-01-13T05:49:26Z http://ir.bdu.edu.et/handle/123456789/15358 Identification of Suitable Lands for Surface Irrigation Using GIS-Based Multicriteria Evaluation Techniques in Andassa Watershed, Abay Basin, Ethiopia Workie Almaw Irrigation Agriculture plays an important role to maintain sustainable food security by improving agricultural production. Uneven distribution and rainfall shortage resulted in unsustainable food production leading to food insecurity in Ethiopia. The establishment of irrigation development strategies may have tremendous role to reduce the risk of uneven distribution of rainfall. This study aims to identify suitable lands for surface irrigation development in Andasa watershed Abay basin, Ethiopia based on GIS based multicriteria evaluation technique. Bio-physical factors (land use land cover, soil, slope, and river proximity), that significantly affect surface irrigation suitability were considered. Each of these was processed and analyzed for its potential contribution to surface irrigation suitability on a pixel-by-pixel basis. The factors were weighted using a pair-wise comparison matrix and weights were combined using the weighted overlay analysis. The analysis result indicated that 5.4, 44.4, 49.3, and 0.5% were highly, moderately, marginally, and not suitable for surface irrigation, respectively. Majority of the study area (50.2%) is suitable for surface irrigation. slope and River proximity were the major limiting factor and the cause for the majority of the study area was highly suitable to moderately suitable class. Similar studies in the future should consider soil chemical properties since this study didn’t consider soil chemical properties as a factor in the overlay analysis. Fri, 01 Jul 2022 00:00:00 GMT http://ir.bdu.edu.et/handle/123456789/15358 2022-07-01T00:00:00Z http://ir.bdu.edu.et/handle/123456789/15087 Effects of soil water conservation practices and slope gradient on selected soil physic chemical properties in Hawker watershed, Northwest Ethiopia Meseret Ambachew Evidence on effects of soil physic chemical properties under different soil water conservation practices and slope gradient is important for sustainable land resource management. However, the effects of soil water conservation practices and slope gradient on soil fertility has not been assessed as such.in the study area. This study was conducted in Hawker water shed northwest Ethiopia to investigate the effects of soil physic chemical properties under different soil water conservation practices and slope gradient. Two soil water conservation namely stone bound and beach terrace and three slope gradient (top, middle and bottom slope position) to determine soil physic chemical properties. A total of 36 composite soil samples were collected at two conservation structure and three slope positions. You empirical data obtained from the soil result revealed that soil and water conservation and slope gradient effect on selected soil physic chemical properties in the study water shed site. Soil texture (sand, silt and clay),bulk density ,moisture content ,soil pH ,organic carbon, total nitrogen, available phosphorus, action exchange capacity and electrical conductivity were significantly (p<0.05) affected by both soil water conservation practices and slope gradients. Thus soil water conservation and slope gradient had shown great effect on soil properties. The highest clay (37.67-24.78%), moisture content (8.15-7.12%), soil pH (5.32-4.24), organic carbon (1.62-0.96%),total nitrogen (0.24-0.08%),available phosphorus(3.02 2.58ppm), action exchange capacity (17.48-12.34cmolcg-1) and electrical conductivity(0.13 0.06ds/m)whereas the lowest sand and bulk density were observed under the treated stone bound. Conversely, the lowest observed under untreated bench trace from soil and water conservation practices. In case of slope gradient, the highest clay, moisture content, pH (5.33-4.10), organic carbon(1.72-1%), total nitrogen(0.27-0.12%), available phosphorus(2.99-2.65ppm), action exchange capacity (16.78-12.15cmolcg-1) and electrical conductivity(0.12-0.06ds/m) in addition to the lowest sand and bulk density were recorded in the bottom slope however the lowest under on the top slope position. In the study water shed UN conserved structure and bottom slope position have a negative effect on soil physic chemical properties. Therefore, implementing appropriate soil water conservation practices to manage physic chemical properties of soil sis important in the watershed Tue, 01 Feb 2022 00:00:00 GMT http://ir.bdu.edu.et/handle/123456789/15087 2022-02-01T00:00:00Z