-Introduction. Algerian oases are characterized by a diversification of local fruit species and cultivars. However, this diversity is subject to erosion. To preserve the genetic heritage, we undertook the first work on the inventory of fruit species crops in the region of Touggourt in south-eastern Algeria. Materials and methods. Our working methods were based on surveys carried out on farms in the Oued Righ region according to a questionnaire that met our objectives. For this, we divided the study region into three zones and in each zone we selected ten farms for the inventory of fruit species cultivated. Results and discussion. The results of our investigations allowed us to identify thirteen species, including four species with a wide distribution (pomegranate tree, apricot tree, fig tree and vine). The local genetic diversity of these species is little known. The varieties or cultivars inventoried have local names given by the farmers in the region according to certain morphological characteristics of the fruit. We surveyed five cultivars for the fig tree, two cultivars for the pomegranate tree, two cultivars for the vine, and two apricot tree cultivars. The study of the biodiversity of fruit trees in the Oued Righ region showed high richness of the species and cultivars; some are local and others are endemic to the region. Better knowledge of genetic diversity will begin with tests of behavior and characterization of the different genotypes encountered to dispel the ambiguities and to highlight the actual composition of populations or varieties of different species.Algeria / Sahara / oases / biodiversity / fruit crops / farm surveys / erosion La biodiversité des espèces fruitières dans la vallée de Oued Righ : cas de la région de Touggourt (Algérie).Résumé -Introduction. Les oasis algériennes se caractérisent par une diversification des espèces fruitières locales et de leurs cultivars. Cependant, cette diversité est sujette à l'érosion. Afin de préserver le patrimoine génétique, nous avons entrepris un premier travail d'inventaire des cultures fruitières dans la région de Touggourt au sud-est de l'Algérie. Matériel et méthodes. Nos méthodes de travail ont été basées sur des enquêtes menées dans les exploitations agricoles de la région d'Oued Righ à partir d'un questionnaire orienté vers nos objectifs. Pour cela, nous avons divisé la zone d'étude en trois zones et, dans chaque zone, nous avons sélectionné dix fermes qui ont donné lieu à un inventaire des espèces fruitières cultivées. Résultats et discussion. Les résultats de nos enquêtes nous ont permis d'identifier treize espèces, dont quatre avec une large distribution (grenadier, abricotier, figuier et vigne). La diversité génétique locale de ces espèces est peu connue. Les variétés ou cultivars inventoriés portent des noms locaux donnés par les agriculteurs de la région en fonction de certaines caractéristiques morphologiques du fruit. En ce sens, nous avons identifié cinq cultivars pour le figuier, deux cultivars pour le grenadier, deux cultiva...
hree field experiments (2008 to 2011) were conducted to evaluate the ability of winter wheat (Triticum durum Desf. var. Carioca) to utilize and acquire soil phosphorus and nitrogen under different sources of phosphate fertilizers (Fosfactyl, Single super phosphate and Mono-ammonium-phosphate) and rates of applications (30, 60, 90 and 120 kg Pha-1) with a fixed level of nitrogen fertilization. Results revealed a significant effect of P rates on phosphorus use efficiency (PUE) and nitrogen use efficiency (NUE); however, P sources fertilizer had non-significant effect in all three cropping seasons. PUE and NUE decreased markedly with increasing P supply that did not result in an improvement of P and N uptake. Grain protein content was significantly influenced by phosphorus fertilization in 2008-09. The best values were obtained by Single super phosphate and P rate 60 kg ha-1.
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