http://dspace.univ-setif.dz:8888/jspui/handle/123456789/241 2026-05-12T01:47:59Z 2026-05-12T01:47:59Z Guechi, A. Rouag, N. http://dspace.univ-setif.dz:8888/jspui/handle/123456789/350 2015-03-23T12:22:39Z 2010-01-01T00:00:00Z

Titre: Leaf spot of olive tree caused by cycloconium oleaginumin setif region-algeria Auteur(s): Guechi, A.; Rouag, N. Résumé: Results indicate that the infection of olive trees by the olive and leaf spot in Setif region increases consideably during March, April, October and November. The ratio of the infected leaves was higher at the northern part of the trees (61%) as compared to other directions (46-49%), and was more lower than the higher - parts of trees. The lowest three couples of leaves were much more infected (56%) than the leaves abovethem (26%).The production of conidia from spot on the fallen leaves continued when the leaves were placed in humid conditions, in petri dishes, for 14 days in Aapril or 8 days in May. The sexual phase of the fungus could not be derected on the infected and fallen leaves.

2010-01-01T00:00:00Z Hafsi, M. Akhter, J. Monneveux, P. http://dspace.univ-setif.dz:8888/jspui/handle/123456789/348 2015-03-23T12:22:06Z 2010-01-01T00:00:00Z

Titre: Leaf senescence and carbon isotope discrimination in durum wheat(triticum durum desf.) under severe drought conditions Auteur(s): Hafsi, M.; Akhter, J.; Monneveux, P. Résumé: The relationships between leaf senescence, carbon isotope discrimination and yield performance were examined in durum wheat (Triticum durum Desf.), in the high plains of Setif, eastern Algeria. Ten CIMMYT high-yielding cultivars were grown during two cropping seasons characterized by low rainfall (217 and 162 mm, respectively), freezing temperatures at heading stage and terminal heat stress. Senescence was assessed using numerical image analysis (NIA). Carbon isotope discrimination was analyzed in flag leaves at anthesis and grain at maturity. Senescence was significantly negatively correlated to grain yield in season 1, but not in season 2. There was no relationship between Δ and grain yield in both seasons. The absence of association between Δ and grain yield is likely to be due a strong contribution of pre-anthesis assimilates to yield together with a sink limitation of yield.

2010-01-01T00:00:00Z FENNI, M. MACHANE, Y. http://dspace.univ-setif.dz:8888/jspui/handle/123456789/346 2015-03-22T13:30:55Z 2010-01-01T00:00:00Z

Titre: Changement climatique et agriculture de conservation Auteur(s): FENNI, M.; MACHANE, Y. Résumé: Algerian agriculture will face many challenges over the coming decades. The degradation of natural resources will exert an enormous pressure on the food security of the population growth. These conditions could be aggravated by climate change. Added to this, heat stress will reduce yields significantly, especially in areas where crops are already near their maximum heat tolerance. Rainfall patterns and the hydrological cycle will be affected. The drought-prone regions may experience longer dry periods and more stringent which will cause a decrease in soil moisture and increased erosion. New approaches to the sustainable management of natural resources used in agriculture are necessary; they could reduce emissions of greenhouse gases, reduce production costs and improve yields. Conservation of agriculture is one of these approaches; it seeks sustainable farming systems by combining minimum tillage, using crop rotation, and maintaining a permanent soil cover. Conservation farming helps to preserve the environment and reducing inter-seasonal variability of yields in low rainfall areas, mainly by limiting the decline in yields during dry years. Direct seeding is an important component of conservation agriculture; this technique reduces the disturbance of the soil, improves the efficiency of water use, enriches the soil with organic matter and reduces erosion. The accumulation of organic matter reduces the use of chemical fertilizer, improve soil biological properties and sequester carbon. Today, no-till farming is used on about 70 million ha, or about 5% of cropland in the world.

2010-01-01T00:00:00Z Dekhili, M. http://dspace.univ-setif.dz:8888/jspui/handle/123456789/344 2015-03-22T13:33:01Z 2010-01-01T00:00:00Z

Titre: Fertilité des élevages ovins type « Hodna » menés en extensif dans la région de Sétif Auteur(s): Dekhili, M. Résumé: The main purpose of this investigation was to test the effect of five main effects, which are season of mating, ewe age, flock, sex and type of birth of the lamb. Five traits of the reproductive performances of the ewe were analyzed. The experimental materiel was composed of 18 flocks from coming from Setif area. The effect of each main effect varied from trait to trait, although the most important variation came from the flock’s effect, which is mainly explained by a biological reaction of the ewes according to location. The least means square observed for each trait were low according to the results obtained by many authors. This situation, could be improved if a better attention is reserved to sheep in this area and in Algeria as well.

2010-01-01T00:00:00Z