Добірка наукової літератури з теми "Azote – déficit"
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Статті в журналах з теми "Azote – déficit":
Sadani, M., N. Ouazzani, and L. Mandi. "Impact de la sécheresse sur l'évolution de la qualité des eaux du lac Mansour Eddahbi (Ouarzazate, Maroc)." Revue des sciences de l'eau 17, no. 1 (April 12, 2005): 69–90. http://dx.doi.org/10.7202/705523ar.
Mande, Irène Kibal, Prosper Kanyankogote, Ruben Koy Kasongo, Paul Mafuka, Jeancy Ntuka Luta, Alasca Ekuya Lombolu, and Crispin Mulaji Kiela. "Impacts des caractéristiques physico-chimiques des sols sur la maladie de Konzo dans le territoire de Kahemba dans la province du Kwango en République Démocratique du Congo." Revue Africaine d’Environnement et d’Agriculture 6, no. 4 (January 9, 2024): 23–31. http://dx.doi.org/10.4314/rafea.v6i4.3.
JOUVEN, Magali, Laurence PUILLET, Christophe PERROT, Thomas POMEON, João-Pedro DOMINGUEZ, Thierry BONAUDO, and Muriel TICHIT. "Quels équilibres végétal/animal en France métropolitaine, aux échelles nationale et « petite région agricole » ?" INRA Productions Animales 31, no. 4 (January 24, 2019): 353–64. http://dx.doi.org/10.20870/productions-animales.2018.31.4.2374.
Faye, Bernard, and C. Mulato. "Facteurs de variation des paramètres protéo-énergétiques, enzymatiques et minéraux dans le plasma chez le dromadaire de Djibouti." Revue d’élevage et de médecine vétérinaire des pays tropicaux 44, no. 3 (March 1, 1991): 325–34. http://dx.doi.org/10.19182/remvt.9174.
DIRRENBERGER1, P. "Méthanisation (partie 1) : principe, paramètres et polluants émis – état de l’art." Techniques Sciences Méthodes, no. 9 (September 21, 2020): 15–30. http://dx.doi.org/10.36904/tsm/202009015.
HENRY, Y. "Alimentation du porc pour la production de viande maigre : évolutions récentes et perspectives." INRAE Productions Animales 6, no. 1 (February 27, 1993): 31–45. http://dx.doi.org/10.20870/productions-animales.1993.6.1.4185.
Debaeke, P., M. Cabelguenne, M. L. Casals, and J. Puech. "Élaboration du rendement du blé d'hiver en conditions de déficit hydrique. Il. Mise au point et test d'un modèle de simulation de la culture de blé d'hiver en conditions d'alimentation hydrique et azotée variées : Epiephase-Blé." Agronomie 16, no. 1 (1996): 25–46. http://dx.doi.org/10.1051/agro:19960102.
Diatta, Ambroise, Abdoulaye Dieng, Mamadou Tandiang Diaw, Thierry Daniel Tamsir Nesseim, and Saliou Ndiaye. "Production et valeur nutritive de fourrages de pois Mascate (Mucuna pruriens (L.) DC. var. utilis (Wall. ex Wight) Baker ex Burck) cv. Ghana cultivé dans le Centre et Nord bassin arachidier sénégalais." International Journal of Biological and Chemical Sciences 14, no. 4 (August 17, 2020): 1262–72. http://dx.doi.org/10.4314/ijbcs.v14i4.8.
Assih, Alèdi, and Amen Yawo Nenonene. "Etat de fertilité des sols des vergers d’anacardiers (Anacardium occidentale L.) et ses effets sur la productivité en noix d’anacarde au Togo." International Journal of Biological and Chemical Sciences 16, no. 4 (October 29, 2022): 1448–58. http://dx.doi.org/10.4314/ijbcs.v16i4.8.
Dasta, Joseph F., Mark Mlynarek, Barbara J. Zarowitz, Brendar R. Morand, and Chantal Guevremont. "Individualizing Nutrition in Patients with Acute Respiratory Failure Requiring Mechanical Ventilation." Drug Intelligence & Clinical Pharmacy 21, no. 11 (November 1987): 865–70. http://dx.doi.org/10.1177/106002808702101102.
Дисертації з теми "Azote – déficit":
Gonzalez, Dugo Maria-Victoria. "Effet du déficit hydrique sur l'état de nutrition azotée chez les graminées fourragères." Poitiers, 2006. http://www.theses.fr/2006POIT2257.
Crop Nitrogen Nutrition Status (NNS) relates the amount of nitrogen in plants in relation to needs for instantaneous growth. It is known that water deficit diminishes NNS through a series of processes belonging to plant nitrogen metabolism and soil nitrogen cycle. The NNS results from the balance between demand, defined by crop growth and the nitrogen that is available for plant uptake. The effect of water deficit on crop growth is well known. The effect on N uptake is caused by a) the soil water status that determines diffusive and convective flows of nitrogen, which are the responsible of transport of nitrogen to the roots and b) the plant water status that determines the needs of nitrogen for growth. Two experiments were made during summer 2003 and 2004 on tall fescue and Italian ryegrass, species with a contrasted growth system, which also enabled us to study the influence of root distribution in soil on the effect of water deficit on NNS. Measurements of the nitrogen nutrition index enabled us to follow the variations of NNS closely. Immediate responses of NNS to any change in system water status were measured, involving a variation in nitrogen flow to roots, mainly transpiration-dependant convective flow. To analyse a possible direct effect of plant and/or soil water status on N uptake, experiments in a split-root system and controlled environment were made. Results showed that independently of water effects on C fluxes, there was a direct effect, which was variable between grass species, and that might be related to a nitrogen accumulation in roots
Rouached, Aida. "Relations hydriques et métabolisme azoté chez deux légumineuses fourragères Sulla carnosa et Medicago truncatula en condition de déficit hydrique." Angers, 2014. http://www.theses.fr/2014ANGE0013.
Water deficit stress causes major economic and ecological problems, such as the significant reduction in plant production, especially in forage species. The effects of drought on biomass production is often associated to a disturbance of the nitrogen metabolism, this element is essential for plant growth and development. Based on physiological, biochemical and molecular approaches we have characterized the response of Sulla carnosa and Medicago truncatula to water deficit stress alone or combined with salt stress, in order to compare drought tolerance of these two species and to identify tolerance traits related to nitrogen metabolism. We studied the effects of water deficit on the expression of genes encoding enzymes involved in the regulation of nitrogen metabolism, such as glutamine synthetase (GS) and glutamate dehydrogenase (GDH). Activities of enzymes involved in the biosynthesis of compatible nitrogenous compounds such as proline (pyrroline 5-carboxylate synthetase P5CS and proline dehydrogenase PDH) were determined, as well as the expression of a nitrate transporter MtNRT1. 3. Our results showed a marked effect of water deficit stress on the biomass production of both species, with a more pronounced effect on the halophytic one ((Sulla carnosa) when compared to Medicago truncatula. An effect of water deficit is also observed on the activity of enzymes involved in ammonium assimilation (GS and GDH). In both species glutamate metabolism was directed towards the synthesis of adaptive metabolites such as proline. Upon rehydration, a partial plant growth re-establishment was observed. Regrowth capacity is a very important for forage plant, since in their natural habitats they are exposed to alternating rainy and dry periods. The additino of salt to water deficit stressed-plants mitigates the deleterious effects of this constraint on growth in the halophytic species S. Carnosa
Sérélé, Zogbo Charles. "Prédiction des rendements agricoles du maïs et du soya, et du déficit en azote du maïs à l'aide d'images aéroportées et d'un réseau de neurones à rétropropagation." Thèse, Université de Sherbrooke, 2002. http://savoirs.usherbrooke.ca/handle/11143/2726.
Hereil, Alexandre. "Génétique d'association et prédiction génomique de la tolérance au stress abiotique chez la tomate." Electronic Thesis or Diss., Avignon, 2024. http://www.theses.fr/2024AVIG0374.
Abiotic stresses, such as excessive salinity or nutrient deficiency, which often result in substantial yield losses, constitute significant challenges to global agriculture. These stresses are particularly detrimental in regions facing poverty, food insecurity and water scarcity. Improving the resilience of crops of high economic and nutritional value such as tomato (Solanum lycopersicum L.) to abiotic stresses could offer significant benefits, both economically and in terms of public health. The aim of this thesis is to identify the genetic components of abiotic stress tolerance in tomato and to explore the potential of genomic prediction to improve these traits. In the first chapter, we looked at the genetic architecture of nitrogen deficiency tolerance. We used a comprehensive methodology that integrates QTL mapping with multiparental population, genome-wide association study (GWAS) using a diversity panel, and RNA-seq to identify candidate genes related to nitrogen metabolism. The next two chapters are devoted to the study of salt stress tolerance. We first studied several traits associated with sodium accumulation in various plant organs and developmental stages in a GWAS panel, which enabled us to identify QTLs and a key candidate gene involved in sodium transport within the plant. In addition, we have also studied the impact of salt stress on the root metabolome, characterising metabolites differentially regulated by salt stress and identifying biomarkers of salinity tolerance. QTLs and candidate genes linked to these target metabolites have been identified. In the following two chapters, we engaged GWAS and genomic prediction in multi-environmental analyses using a diversity panel grown under a range of environmental conditions. We have identified interaction QTLs - whose allelic effects vary according to environmental conditions - and compared different GWAS methodologies. Then we have evaluated the effectiveness of various genomic prediction models for improving tolerance to abiotic stress. Our results revealed several candidate genes that require further experimental validation to elucidate their functional roles and potential applicability in breeding programmes. Preliminary results from genomic prediction models highlight the interest of using these approaches to predict tolerance to abiotic stresses, although further validation in breeding populations is required
Ghashghaie, Jaleh. "Photosynthèse et relations hydriques de la Fétuque élevée sous carence azotée : effet d'un cycle de dessèchement-réhydratation." Paris 11, 1986. http://www.theses.fr/1986PA112258.
Choné, Xavier. "Contribution à l'étude des terroirs de Bordeaux : étude des déficits hydriques modérés, de l'alimentation en azote et de leurs effets sur le potentiel aromatique des raisins de Vitis vinifera L. cv. Sauvignon blanc." Bordeaux 2, 2001. http://www.theses.fr/2001BOR20917.
Soil mapping of Entre-Deux-Mers area revealed various soil types. Vine water deficits have been studied with stem water potential measured with a pressure chamber. Stem water potential is a more discriminating indicator than predawn leaf water potential to assess moderate water deficits. Conversely to predawn leaf water potential, stem water potential can detect water deficit the days following summer rainfall. When water was whithholding, shoot growth speed decrease occured for stem water potential value of 0,65 MPa. This value can be considered as a threshold value of the occurence of moderate vine water deficit. Stem water potential and leaf transpiration rate are strongly linked during continuous soil dehydration. Aromatic potential of grape is upon the dependence on the precursor content (P-4MMP, P-4MMPOH, P-3MH), the glutathion content and the phenolic content. A marked nitrogen deficiency decreased the aromatic potential of the grape. Low nitrogen status is linked with high phenolic content and low glutathion and precursor content in the grape. Post veraison, moderate vine water deficit have positive effect on the aromatic potential of the grape
Hansmetzger, Sylvain. "Etude des modes de rotation continue d'une détonation dans une chambre annulaire de section constante ou croissante." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2018. http://www.theses.fr/2018ESMA0002/document.
Our study aims at improving the understanding of how a detonation may continuously rotate. It is focused on rotation modes in an annular chamber with constant or linearly increasing normal section. The functioning principle is based on the continuous injection of fresh reactive gases so as to regenerate a reactive layer ahead of the detonation front and maintain sufficient conditions for detonation propagation. The main incentive of the work is the development of propulsive devices that use detonation as the combustion mode (Rotating Detonation Engine, RDE). We have designed and built an experimental test bench of which the main part is an annular chamber with inner diameter 50 mm length 90 mm, and thickness 5 or 10 mm. The chamber can be equipped with cylindrical or conical kernels with lengths ranging between 12 mm and 90 mm and, for the conical kernels, with the apex half-angles ranging between 0± and 14.6±. The fuel is ethylene and the oxidizer is a mixture of oxygen and nitrogen, and they are injected separately in the chamber. We have considered several nitrogen concentrations so as to vary the reactive mixture detonability. The characterizations of the detonation regimes, velocities and pressures are based upon the analyses of signals from pressure transducers and of direct light visualizations from high-speed cameras. Our experimental results detail the ignition phase, the combustion modes and their stability. We have carried out experiments with several detonabilities, mass-flow rates and kernel geometries. Our main finding is that modifying the kernel geometry, specifically decreasing the kernel length and increasing its conicity (the apex half-angle) significantly improve detonation velocities and pressures, unlike the first two parameters that have much lesser influences, in our conditions. We have conducted a numerical analysis that suggests that dilution and heating of the fresh gases by detonation products explain the measured deficits of pressure and velocity. We have presented a calculation of thermodynamic efficiency which, contrary to former modeling includes a more realistic structure of rotating detonation.We have proposed a calculation of detonation-front height for the rotation modes and the chamber geometries in this work. Our study thus demonstrates the interest in further research work on inner geometry of rotating-detonation chambers and on phenomena that may be responsible for efficiency losses