Littérature scientifique sur le sujet « Pertes d'azote »
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Articles de revues sur le sujet "Pertes d'azote"
Picard, Didier. « Réduire les pertes d'azote dans l'élevage ». Cahiers Agricultures 25, no 1 (janvier 2016) : 17001. http://dx.doi.org/10.1051/cagri/2016006.
Texte intégralVelasco, N., C. L. Long, D. A. Otto, N. Davis, J. W. Geiger et W. S. Blakemore. « Comparaison de trois méthodes pour estimer les pertes totales d'azote chez les patients hospitalisés ». Nutrition Clinique et Métabolisme 4, no 4 (janvier 1990) : 230. http://dx.doi.org/10.1016/s0985-0562(05)80337-1.
Texte intégralAbissy, M., et L. Mandi. « Utilisation des plantes aquatiques enracinées pour le traitement des eaux usées urbaines : cas du roseau ». Revue des sciences de l'eau 12, no 2 (12 avril 2005) : 285–315. http://dx.doi.org/10.7202/705353ar.
Texte intégralAudu, R., A. B. Amin, M. S. Sadiq, A. Tijjani, L. Babangida et I. Abdullahi. « Chemical Composition of African Black Plum (Vitex Doniana) Leaf Ensiled with Urea and Broiler Litter ». Nigerian Journal of Animal Production 49, no 4 (10 février 2023) : 145–53. http://dx.doi.org/10.51791/njap.v49i4.3711.
Texte intégralDOURMAD, Jean-Yves, Anne BOUDON et Agnès NARCY. « Le phosphore dans les systèmes d'élevage ». INRAE Productions Animales 33, no 1 (12 mars 2020). http://dx.doi.org/10.20870/productions-animales.2020.33.1.3126.
Texte intégralThèses sur le sujet "Pertes d'azote"
Boisserie, Hélène. « Etude des pertes d'azote par volatilisation dans les rizières de Camargue ». Montpellier 2, 1990. http://www.theses.fr/1990MON20159.
Texte intégralKengni, Lucas. « Mesure in-situ des pertes d'eau et d'azote sous culture de maïs irriguée : application à la plaine de la Bièvre (Isère) ». Grenoble 1, 1993. http://www.theses.fr/1993GRE10067.
Texte intégralKebalo, Lelenda. « Produits résiduaires organiques issus de déchets périurbains : évaluation des potentialités et impacts agro-environnementaux en maraîchage périurbain ». Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASB003.
Texte intégralIn densely populated areas, significant amounts of organic waste are generated, presenting an opportunity for peri-urban agriculture, particularly in the context of developing market gardening (MG) driven by evolving policies and the growing demand for locally sourced food. Despite this potential, the benefits and environmental impacts related to the use of bio-based fertilizers (BBFs) derived from these waste materials in MG and related crop successions remain poorly understood. Therefore, this study adopted a multifaceted approach involving farmer interviews, field and greenhouse experiments, and long-term simulation of BBF use to comprehensively explore these aspects.Findings revealed that the Saclay plateau (SP), a peri-urban study area near Paris, is experiencing an increase in market gardening activities. The most commonly used BBFs in MG currently include green waste compost and animal manure. Additionally, there is a growing interest in biowaste compost. Under specific safety conditions, there is potential consideration for the use of human urine and food biowaste digestate. According to estimates, the BBFs already present on the SP can significantly meet the soil amendment demands for MG. However, concerning BBFs with fertilizing value, the potentially available biowaste digestate and human urine could be of great interest as they are also capable of largely fulfilling the MG requirement.Experimental investigations demonstrated that the combined use of BBFs with amendment and fertilizing value resulted in lettuce or tomato yields comparable to synthetic fertilizers (SFs) and did not pose any risks associated with heavy metal uptake or pathogen contamination. Soil assessments highlighted the ability of BBFs to maintain soil pH and potentially increase soil organic carbon and nutrient stocks over the long term.Using the calibrated STICS crop model for lettuce, simulations involving BBF use within a lettuce-wheat rotation (a common practice around SP) over a 30-year period indicated significant increases in wheat and lettuce yields, although the mineral nitrogen (N) rate was set to be limited and consistent over time. The application of green waste and food waste composts at 4 t C ha-1 or manure at 2.3 t C ha-1 every 2 years, combined with the incorporation of wheat and cover crop residues, increased soil organic carbon stocks from 36 t C ha-1 (initial stock) to values ranging from 45 to 55 t C ha-1, depending on the type of BBFs used. The increase was more pronounced for green waste compost applications.Nevertheless, the study drew attention to the significant risk of nitrate leaching associated with the application of BBFs, particularly when nitrogen mineralization occurred during winter at the initial stages of wheat growth. Furthermore, the use of BBFs appeared to contribute to an increase in nitrous oxide (N2O) emissions.This thesis work highlighted the considerable potential of BBFs in peri-urban market gardening. However, it also emphasized the critical necessity for ongoing research, strict safety protocols, and specific application methods to effectively harness the benefits of these BBFs in MG practices. Moreover, assessing the long-term agro-environmental impacts using BBFs at optimal rates could help estimate the reduction in SF use over time while maintaining economical yields, and also explore the more realistic potential of nitrate leaching, N2O emission, and ammonia volatilization
Ferrant, Sylvain. « Modélisation agro-hydrologique des transferts de nitrates à l'échelle des bassins versants agricoles gascons ». Toulouse 3, 2009. http://thesesups.ups-tlse.fr/779/.
Texte intégralThe present work aimed to assess nitrogen trasfer and transformation in stream of agricultural catchment of Gascogne region, in order to evaluate agricultural practices change to decrease nitrate river contamination. A continuous in situ sampling protocol was used at the outlet of the small agricultural catchment in Auradé (3. 3 km2 in Gers district, South-West of France) to measure the fine temporal variation of nitrate concentration. Infra-daily high variations of concentrations have been observed during flood events, the high concentrations explain a significative part of annual nitrogen loads during these hydrological events. The spatially, physically based modelling approach of the Auradé catchment has then been used to evaluate water and nitrogen balance at the small catchment scale. Two catchment models have been chosen : TNT2, whitch is fully distributed and developped for small catchment with shallow groundwater, and SWAT, semi-distributed and developped for larger catchment. The use of both models permits to : - show that both of them failed to simulate accurately the daily nitrogen losses intensity in river observed during flood events, even if modelling approach of SWAT is more adapted to simulate processes involved - simulate a same global water and nitrogen balance with opposing simulated processes - show the main influence of mineralisation and denitrification dynamic simulated to conclued on ability of models to represent reality. TNT2 has been evaluated to be more adapted to simulate agricultural changes designed or already implemented in Auradé catchment. Results of this virtual experimentation show that agricultural changes already implemented would have decresed for 16% the annual nitrogen losses, and that if catch crop had been implemented, nitrogen losses would have decrease of 18% more. SWAT has after been calibrated at the larger scale of the Save catchment of 1110km2 whitch include Auradé catchment. The global parametrisation has been modified for the agro-pedological context of Auradé catchment, context area whitch represent 25% of the total Save catchment area. Major hydrological parameters calibrated on Auradé catchment has been used for calibrating this area. The increase of discharge prediction quality is significative and show the contribution of these areas to daily discharge at the Save catchment outletduring some rainy events. Predictions of water and nitrogen concentration may be improved in taking land cover spatialisation into account
Gutknecht, Élodie. « Interactions côte-large dans le système de l'upwelling du Benguela par modélisation couplée physique/biogéochimique ». Toulouse 3, 2011. http://thesesups.ups-tlse.fr/2713/.
Texte intégralThe main objective of this PhD thesis is the study of the shelf/offshore interactions in the Benguela upwelling system, off South African and Namibian coasts, using a numerical model as well as satellite and in-situ data. A Biogeochemical model adapted for the Benguela Upwelling System (BioBUS), taking into account the main processes linked with eastern boundary upwelling systems and associated oxygen minimum zones, has been developed and coupled with the ROMS hydrodynamical model, in order to implement a realistic configuration in the Namibian upwelling system (Northern Benguela), the studied area of this PhD thesis. This PhD thesis contributes to the improvement of the physical/biogeochemical couplings as well as the understanding of the Eastern Boundary Upwelling Systems (EBUS) and their local and regional impact. Nitrogen inputs from the upwelling area to the South Atlantic oligotrophic gyre were estimated (0. 38 molN. M-2. Yr-1) and are of the same order as other possible N sources (such as atmospheric deposition, biological fixation,. . . ) sustaining primary production in the subtropical gyre (from 0. 01 to 0. 24 molN. M-2. Yr-1). Nitrogen losses by denitrification and anammox processes linked with the oxygen minimum zone (2. 2 108 molN. Yr-1) have the same order of magnitude than N2O outgasing to the atmosphere (5. 5 108 molN. Yr-1), however they are underestimated when compared with in-situ estimations. Air-sea N2O fluxes are clearly significant in this area for the atmospheric N2O budget. Indeed, even if this area represents 1. 2% of the EBUS, its estimated N2O emission contributes to 4% of the EBUS emissions. Furthermore, this PhD thesis shows the important role of mesoscale processes in the nitrogen total transport off the Namibian continental shelf