Saidi I.,Algeria National School of Agronomy |
Mouhouche F.,Algeria National School of Agronomy |
Abri H.,Blida University
Quality Assurance and Safety of Crops and Foods | Year: 2017
The aim of this study was to assess the use of pesticides (insecticides and fungicides) on tomatoes grown in greenhouses in two important agricultural regions near Algiers, Algeria (Boudouaou and Douaouda). Twenty samples were taken (ten from each region) to measure the residual concentration of nine pesticides (chlorpyrifos-ethyl, fenitrothion, metalaxyl, procymidon, triadimenol, diazinon, lambda-cyhalothrin, cyfluthrin, and indoxacarb). Samples were analysed by the multi-residue method, with solid-phase-extraction purification followed by quantification using gas chromatography-mass spectrometry. Five pesticides were detected in tomato samples from the Douaouda area, including chlorpyrifos-ethyl (0.028±0.001 mg/kg), fenitrothion (0.68±0.004 mg/kg), metalaxyl (0.048±0.015 mg/kg), procymidon (0.046±0.02 mg/kg) and triadimenol (0.035±0.003 mg/kg). In the Boudouaou area, only three pesticides were detected: chlorpyrifos-ethyl (0.43±0.011 mg/kg), triadimenol (0.21±0.002 mg/kg) and procymidon (0.03±0.0055 mg/kg). Synthetic pyrethroids were not found in either region. These results provide important information on pesticide contamination of tomatoes in two key agricultural areas in Algeria, and highlight the need to monitor and control residual pesticide levels to protect consumer health. © 2016 Wageningen Academic Publishers.
Boubakeur G.,Ziane Achour University of Djelfa |
Mohamed S.,Université Ibn Khaldoun |
Gahdab C.,Algeria National School of Agronomy
International Journal of Global Warming | Year: 2017
The delay of defoliation, the advance of blooming, in January, of some recently planted palm trees, the appearance of the housefly in winter, and the disappearance of the featuring cold and frost of Djelfa both prompted the need of a scientific explanation, based on the analyses of mean, minimum and maximum air temperatures records for a period of 40 years by the methods [coefficient of variation (CV), trend test, correlation and homogeneity test], which have shown that, although, the fluctuations of the mean temperature, especially in winter (CV = 27%), a global warming of 1°C was recorded, more due to Tmin (1.4°C) than to Tmax (0.92°C). Summer was the most warming season, then autumn and finally spring. However, a slight cooling was in December and February, intermediated by January's warming which would cause early break of the overwintering and the subsequent damages. Also, an almost recent abrupt change (of about 1°C to 3°C) was recorded except for winter, whose frost and cold disappearance would be partially caused by drought. © 2017 Inderscience Enterprises Ltd.
Srairi M.T.,Hassan II Agronomy and Veterinary Medicine Institute |
Benyoucef M.T.,Algeria National School of Agronomy |
Kraiem K.,Higher Institute of Agricultural Science
SpringerPlus | Year: 2013
The Maghreb countries (Algeria, Morocco and Tunisia) have experienced since the early 1950s a rapid demographic growth coupled to a significant rhythm of urbanization. This has led to a marked increase in the demand of dairy products. In order to secure the supply, specific policies have been implemented. They mainly consisted in the establishment of a dairy industry, based on the processing of either raw milk produced locally (in Morocco and Tunisia) or imported milk powder (in Algeria). These divergent options have had significant consequences on the whole organization of the dairy chains in these countries, from cattle rearing practices, to milk collection and processing. They have also implied differences in milk and its derivatives' prices and levels of consumption. The paper draws a comparative analysis of milk chains within the three countries: a supply mainly based on imports in Algeria, whereas in Morocco and Tunisia, the demand is satisfied by a chain relying on locally produced cattle milk. The paper also emphasizes on the future challenges that will have to be addressed: a rising volatility of milk and other strategic inputs' prices (feed, machinery, cattle, etc.) in global markets, an improvement in consumers' awareness about milk quality, a further pressure on natural resources (mainly soils and water) to get more raw milk, in countries already suffering an acute water stress. The article also establishes recommendations about specific issues related to the development of the dairy chains in the context of North Africa. These are mainly linked to the fragmented offer induced by numerous smallholder farms, which implies obvious difficulties to assess the hygienic and the chemical quality of milk batches delivered daily. Moreover, this fragmented offer also means that specific support programs will have to be designed, as the vast majority of farms are not dairy specialized, expecting both milk and calf crop from their herds. © 2013 Kumar et al.
Acheuk F.,University of Boumerdès |
Cusson M.,Natural Resources Canada |
Doumandji-Mitiche B.,Algeria National School of Agronomy
Journal of Insect Physiology | Year: 2012
The effects of a methanolic extract of the plant Haplophyllum tuberculatum (ME-Ht) and of teflubenzuron (TFB) were compared on several reproductive variables and ecdysteroid titers in the females of Locusta migratoria. The test products were administered orally to newly emerged females at doses of 1500 (ME-Ht) and 10. μg/female (TFB). The methanolic extract and TFB had comparable effects on several of the variables examined. Both significantly delayed the first oviposition and reduced fecundity and fertility. ME-Ht and TFB also displayed similar effects on ovarian growth, vitellogenesis and ecdysteroid titers. Both treatments induced a drop in hemolymph protein levels as well as a reduction in vitellogenin uptake by oocytes. This delay in oogenesis was accompanied by a resorption of terminal oocytes. However, whereas TFB completely blocked egg hatch, ME-Ht only had a modest inhibitory effect on this variable. Hemolymph and ovarian ecdysteroid titers, as measured by radioimmunoassay, were similar and low in both control and treated females, except for a peak observed only in control females at the end of vitellogenesis. We discuss the functional significance of the observed effects in the context of the putative modes of action of the methanolic plant extract and TFB. © 2011 Elsevier Ltd.
Makhzoum A.,University of Western Ontario |
Benyammi R.,Algeria National School of Agronomy |
Moustafa K.,Institute Mondor Of La Recherche Biomedicale |
Tremouillaux-Guiller J.,University of Tours
BioDrugs | Year: 2014
Plant molecular pharming is a promising system to produce important recombinant proteins such as therapeutic antibodies, pharmaceuticals, enzymes, growth factors, and vaccines. The system provides an interesting alternative method to the direct extraction of proteins from inappropriate source material while offering the possibility to overcome problems related to product safety and source availability. Multiple factors including plant hosts, genes of interest, expression vector cassettes, and extraction and purification techniques play important roles in the plant molecular pharming. Plant species, as a biosynthesis platform, are a crucial factor in achieving high yields of recombinant protein in plant. The choice of recombinant gene and its expression strategy is also of great importance in ensuring a high amount of the recombinant proteins. Many studies have been conducted to improve expression, accumulation, and purification of the recombinant protein from molecular pharming systems. Re-engineered vectors and expression cassettes are also pivotal tools in enhancing gene expression at the transcription and translation level, and increasing protein accumulation, stability, retention and targeting of specific organelles. In this review, we report recent advances and strategies of plant molecular pharming while focusing on the choice of plant hosts and the role of some molecular pharming elements and approaches: promoters, codon optimization, signal sequences, and peptides used for upstream design, purification and downstream processing. © 2013 Springer International Publishing.
Acheheb H.,Algeria National School of Agronomy |
Aliouane R.,Algeria National School of Agronomy |
Ferradji A.,Algeria National School of Agronomy
Asian Journal of Agricultural Research | Year: 2012
This study was carried out to determine the effects of pressure, temperature, pressing time and moisture content on the yield of oil mechanically expressed from Pistacia atlantica Desf. seeds using a hydraulic press conceived at our laboratory and made in Algeria. The ground sample is compressed at various pressures (50-90 and 120 bars) and temperatures (25-40 and 60°C). The effect of thickness cake, pressing time and moisture content was determined at 120 bars and 25°C. The oil expressed was collected and the oil yield was estimated as a percentage of the raw sample before expression. Statistical analysis of effect of these parameters on yield oil was carried out by student's t-test. Effect combined of pressure and temperature was evaluated using Response Surface Methodology. Chemical proprieties of Pistacia atlantica Desf. seeds were determined. Physicochemical analysis of the oil was also carried out to determine its quality potential. The optimum parameter values for maximum oil yield (44, 17%) from seeds were the following: moisture content during pressing = 3.95%, pressing time = 60 min, pressing pressure = 120 bars and temperature during pressing = 40°C.© 2012 Knowledgia Review, Malaysia.
Daoudi A.,Algeria National School of Agronomy |
New Medit | Year: 2016
In some regions, the combined effects of ambitious public policies, with special reference to the creation of infrastructure, and innovative local dynamics have deeply changed the landscape of the Saharan oasis. This is the case of the municipality of El Ghrous in the region of Biskra, where for twenty years, palm tree monoculture and tunnel greenhouses have dramatically expanded on the margins of traditional oasis. In this article, we analyze the factors that promote and those which threaten this agricultural expansion. Four key factors of this development are analysed: public policies, local market development, dissemination of innovation and the water governance system. We show that the adaptability of this agriculture is mainly the result of a complex set of actors, at bilateral and collective level, who manage to reconfigure and adapt the institutional framework of water governance. Finally, we show that in the long term, this set of actors is also a source of vulnerabilities and inequities.
Ouled Belkhir C.,Algeria National School of Agronomy |
Remini B.,Blida University
Journal of Water and Land Development | Year: 2016
The M'zab valley is a hyper arid region of average rainfall not exceeding 100 mm per year. However, the rare floods that occur in M'zab River drain large volumes of surface water. Thanks to the genius of the local population, traditional dams were made for artificial recharge of groundwater. Grace of traditional wells drilled in the valley, farmers irrigate their palm groves and gardens. However, since more than half a century, the contribution of deep drilling for the exploitation of the aquifer of the Continental Intercalary posed environmental problems. On the basis of investigations and surveys of the local population during the years 2010, 2011, 2012 and 2013, it appears that these modern techniques in water catchment caused harmful consequences to the region like the rising of water consumption, pollution of groundwater and soil salinity. Solutions and recommendations are outlined in this article. © 2016 Polish Academy of Sciences (PAN) in Warsaw; © 2016 Institute of Technology and Life Sciences (ITP) in Falenty.
Benslimane H.,Algeria National School of Agronomy
EPPO Bulletin | Year: 2015
La tache helminthosporienne, maladie du blé, communément désignée par l'appellation anglo-saxonne « tan spot » est mondialement rencontrée dans les champs de blé, et peut causer d'importantes pertes. Elle est provoquée par un ascomycète Pyrenophora tritici-repentis, dont les différents isolats semblent très variables sur le plan génétique. Cette maladie est caractérisée par des symptômes typiques, une tache nécrotique entourée d'une chlorose. Huit races de son agent causal sont actuellement reconnues, sur la base des symptômes induits (Chlorose/Nécrose) sur une gamme d'hôtes différentielle. Ces symptômes sont le résultat d'une interaction spécifique entre la plante-hôte et au moins trois toxines spécifiques à l'hôte, Ptr ToxA, Ptr ToxB et Ptr ToxC. L'analyse de cette interaction a démontré que celle-ci apparait comme l'image inversée du modèle du gène pour gène décrit par de Flore. Le présent article est une première revue bibliographique en langue française cernant les grands aspects de cette maladie, son épidémiologie et la diversité de son agent causal. © 2015 OEPP/EPPO.
Adjlane N.,University of Boumerdès |
Doumandji S.-E.,Algeria National School of Agronomy |
Haddad N.,National Center for Agriculture Research and Extension
Cahiers Agricultures | Year: 2012
Honeybees, in addition to their production of honey, pollinate the flowers of fruit trees and other crops. Any threat to them, whether from pesticides, herbicides or diseases, therefore pose serious consequences not only for beekeeping, but also for agriculture in general. For several years, many beekeepers in Algeria have reported deaths in their apiaries. At present, we lack hard data on the causes of such mortality. In order to provide some answers to this problem, we conducted a field study with beekeepers in mid-northern Algeria. This study is complemented by information from the beekeeping cooperative, the technical institute of livestock and veterinary services department at the Ministry of Agriculture, and the regional laboratories of veterinary medicine. Analysis of the results shows bee diseases mainly represented by the Varroa and bee poisoning by insecticides, as well as ecosystem degradation (loss of honey flora) and climate change. All these factors threaten the local bee and have a negative influence on the production of honey.