The objective of this paper was to compare two approaches to land suitability evaluations, Fuzzy MCDA and Boolean, to model the opportunities for sorghum production in the north-western region of Jeffara Plain, Libya. In this paper a number of soil and landscape and climate criteria were identified and their weights specified as a result of discussions with local experts. The Fuzzy MCDA approach was found to be better than the Boolean approach. Boolean logic indicted that the study area has only four suitability classes (highly suitable, moderately suitable, marginally suitable and currently not suitable). In contrast, the results obtained by adopting the Fuzzy MCDA approach showed that the area of study has a greater degree of subdivision in land suitability classes for sorghum. The richer overall picture provides an alternative type of land suitability evaluation to Boolean approaches and allows subtle variations in land suitability to be explored. Index Terms—Fuzzy, MCDA, boolean, uncertainty.
Mukhtar Mahmud Elaalem(8-2012)

تم القيام بهذا البحث سنة (2006 ف) في معامل كلية الزراعة بجامعة الفاتح وذلك لدراسة مدى تأثير مسحوق نبات التين الشوكي (L) Mill Opuntia ficus-indica وقواعد أوراق النخيل المثمر (الكرناف) (L) Phoenix dactylifera في قدرة التربة الرملية على الاحتفاظ بالماء ، وذلك من حيث تأثيرها على سعة الاحتفاظ بالماء ( Water Holding Capacity) ومعامل التوصيل الهيدروليكي التشبعي Hydraulic Conductivity ) ) ، والمحتوي الرطوبي عند قيم شد مختلفة تم إضافة كل من مسحوق نبات التين الشوكي ، قواعد أوراق النخيل ( الكرناف ) و خليطهما إلى التربة الرملية بنسبة وزنيه 0 ، 2.5 ، 5 ، 7.5 % ، ولمقارنة النتائج تم إضافة محسن تجاري ( compost ) للتربة بالنسب المذكورة ، حيث بينت النتائج أن المواد المضافة أدت إلى زيادة سعة التربة بالاحتفاظ بالماء في جميع المعاملات فكانت الأفضلية لمعاملة خليط التين الشوكي والكرناف حيث سجلت 218.7 جم / كجم تربة في عينة الشاهد إلى 442.6 جم / كجم تربة عند نسبة 7.5 % في بداية التجربة و 423.8 جم / كجم تربة عند نهاية التجربة. كما بينت النتائج أن المواد المضافة أدت إلى انخفاض معامل التوصيل الهيدروليكي التشبعي للتربة الرملية في جميع المعاملات وكانت معاملة التين الشوكي أكثر انخفاضا، فقد تغير معامل التوصيل الهيدروليكي من 5 متر/ يوم عند نسبة إضافة 0% إلى 0.7 متر/ يوم عند نسبة إضافة 7.5%. في حين سجلت إضافة المحسنات زيادة في المحتوى الرطوبي لكل المعاملات عند قيم الشد 0.3، 1، 3، 15 بار. Abstract This experiment was conducted in 2006 at laboratories of the faculty of Agriculture, Alfateh university to investigate the impact of Indian fig "Opuntia ficus-indica" in powder form and date palm tree "Phoenix dactylifera leaf bases (Kurnaf) on water holding capacity, haydraulic conductivity, and water content at different tensions. Added materilas were mixed with sandy soil at 0, 2.5, 5 and 7.5% as treatments. To compare results, a commercial compost was added to the soil at the same percetages. Results showed that all treatments improved water holding capacity at all treatments, however, a mix of indian fig and palm tree base treatment was the highest at 7.5%, determined at 442.61 g/kg at the beginning of the experiment and 423.80 g/kg at its end, compared with the control which was 218.74 g/kg soiResults also showed added materials led to decrease in saturated hydraulic conductivity in all treatments, however, indian fig was the most effective, determined at 0.76 m/day at 7.5%, compared with 5.0 m/day for control. Last, all treatments showed increase in water contents at 0.3, 1, 3, and 15 bar tension.
المنتصر بالله مختار محمد القريقني (2010)

Abstract—Water erosion is the most important problems of the soil in the Jabel Nefusa area located in north west of Libya, therefore erosion station had been established in the Faculty of Veterinary and dryfarming research Station, University of the Al-japel Al-gharbi in Zentan. The length of the station is 72.6 feet, 6 feet width and the percentage of it's slope is 3%. The station were established to measure the mount of soil eroded and amount of surface water produced during the seasons 95/96 and 96/97 from each rain storms. The Monitoring shows that there was a difference between the two seasons in the number of rainstorms which made differences in the amount of surface runoff water and the amount of soil eroded between the two seasons. Although the slope is low (3%), the soil texture is sandy and the land ploughed twice during each season surface runoff and soil eroded were occured. The average amount of eroded soil was 3792 grams (gr) per season and the average amount of surface runoff water was 410 litter (L) per season. The amount of surface runoff water would be much greater from Jebel Nefusa upland with steep slopes and collecting of them will save a valuable amount of water which lost as a runoff while this area is in desperate of this water . The regression analysis of variance show strong correlation between rainfall depth and the other two depended variable (the amount of surface runoff water and the amount of eroded soil. It shows also strong correlation between amount of surface runoff water and amount of eroded soil. Key words: Rain, Surface runoff water, Soil, Water erosion, Soil erosion. arabic 13 English 61
ِAbdulfatah Faraj Abdullaha Aboufayed(1-2013)