Decreased wheat crop yields due to the presence of weeds, insufficiently effective herbicides, and the development of weed resistance to high-efficiency herbicides indicated the need to develop alternative ways to control weeds. Therefore, we sought a possible solution in examining the efficiency of different concentrations (1, 5, 10 and 20%) of aqueous extracts of Ambrosia artemisiifolia and Sorghum halepense in controlling certain weed species for wheat crops: Avena fatua, Bromus rigidus and Convolvulus arvensis. The efficacy of aqueous extracts through the content of total phenols and four polyphenolic acids (chlorogenic, p-coumaric, and sikimic) on the level of shikimic acid concentration in treated weeds was investigated. Statistical analysis of the data showed that the change all tested concentrations of aqueous extracts affect the change in the concentrations of sikimic acid , especially the 20% solution of A. artemisiifolia. Conducted research also showed that method of monitoring the content of shikimic acid is adequate for determining the herbicidal effect of plant aqueous extracts
Rabya A Ibrahim(1-2022)

نفذت تجربة حقلية في محطة أبحاث كلية الزراعة بجامعة طرابلس خلال الموسمين الزراعيين 2015/2016 و2016/2017. بهدف تقييم أداء عشرة طرز وراثية من القمح الطري، تم الحصول عليها من المصرف الوطني للمصادر الوراثية النباتية، طرابلس، ليبيا. وفقا لبعض الصفات الظاهرية والإنتاجية. تم تصميم التجربة وفقا لتصميم القطاعات الكاملة العشوائية (RCBD) وبثلاثة مكررات. أظهرت النتائج وجود فروق معنوية في معظم الصفات المدروسة، مما أدى إلى وجود قدر كبير من التباين بين الطرز الوراثية للقمح لكل صفة. حيث لوحظ تفوق الصنف المختار معنويا في معظم الصفات المدروسة تحت ظروف التجربة، وتميز الصنف مكاوي بارتفاع النبات وطول السلامية الأخيرة (80.34، 37.43 سم) علي التوالي، بينما تفوق الصنف بحوث 208 في صفتي طول السفا (7.67) ودليل الحصاد (35.71%). في حين تميز الصنف سيدي المصري بتفوقه بالإنتاج الحيوي وحاصل الحبوب (جم/م2) علي كافة الأصناف الأخرى وبمتوسط قدره (238.8، 74.8 جم/ م2) علي التوالي. أوضحت النتائج وجود علاقة ارتباط موجبة وذات دلالة معنوية بين إنتاجية الحبوب مع كل من طول ورقة العلم (r=0.76*)، عدد الحبوب بالسنبلة الرئيسة (r=0.698*)، وزن الحبوب بالسنبلة الرئيسة والنبات (r=0.66*, 0.85**) على التوالي، والإنتاج الحيوي (r=0.85**). كما تقترح هذه الدراسة إيلاء الاهتمام لهذه الصفات كمؤشر انتخاب لمحصول الحبوب في أي برامج لتربية القمح في المستقبل، بسبب ارتباطها الشديد بالعائد arabic 144 English 17
راضية عمر محمد سالم, حسين سعيد أحمد العجيلي(3-2019)

A B S T R A C T Records on 306 Libyan Barbary lambs descended from 232 ewes sired by 25 rams were included during the period from 2004 - 2009. Analyses were used by ASREML to estimate (CO)Variance, Additive and maternal heritability and Correlations; fitting an animal model including maternal genetic for live weight traits. The objective was to evaluate the performance and previously mentioned genetic parameters in some traits of Barbary sheep in Libya. Mean birth weight (BW), weaning weight (WW) and adjusted weaning weights (adjWW) were 3.11±0.06, 21.11±0.08 and 21.62±0.02 kg respectively. Mean greasy fleece weight (GFW), staple length (SL) and number of crimps/2cm. was 1.98±0.67 kg., 9.67±1.64 cm. and 11.02±1.56 respectively. The additive heritability estimates for (BW), (WW) and (adj WW) were 0.11, 0.21 and 0.27 respectively. The maternal heritability estimates for (BW), (WW) and (adj WW) were 0.05, 0.11 and 0.25 respectively. These results indicate that selecting for improved maternal and for direct effects in Barbary sheep would generate slow genetic progress in BW trait. Direct and maternal genetic and phenotypic correlations among the lamb weights varied between 0.08 and 0.966. The Repeatability estimates for (GFW), (SL) and crimps/2cm were 0.13, 0.03 and 0.03 respectively. The positive phenotypic correlation coefficient between the wool traits of the Libyan Barbary sheep ranged from 0.61 to 0.456. The negative correlation ranged from – 0.259 to – 0.036; It was the highest positive and significant correlation between number of fine and coarse crimps/2cm was 0.456, while the highest negative and significant correlation between number of crimps of fine fiber and coarse fiber ratio was 0.259. It concluded that Low estimates of additive and maternal heritability for live weights indicated the presence of less additive genetic variance and large environmental variance. Hence, improvement through selection may be limited in growth traits if the causes of environmental variation are not removed. Only year’s records can be trusted to predict performance in the wool traits when temporary environmental impacts are minimized. arabic 15 English 89
Ahtash. Abdulkarim , Abo-Zakhar, Aiad , Fathi Abousaq(1-2021)