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Renouvellement du carbone profond des sols cultivés : une estimation par compilation de données isotopiques

Description du sujet. L'article présente une estimation du renouvellement à moyen terme (dizaines d'années) du carbone profond des sols cultivés. Objectifs. Le stockage de carbone sous forme organique dans les sols est un moyen de limiter l'augmentation du CO2 global et le réchauffement climatique. L'objectif est de proposer une première quantification du renouvellement des ...

Effet du biochar sur la biodisponibilité du phosphore dans un sol limoneux acide

Description du sujet. Cet article traite de l'impact du biochar sur la biodisponibilité en phosphore (P) dans les sols en vue d'améliorer la gestion et l'autonomie de la fertilisation en P des cultures. Objectifs. L'objectif général était d'explorer le potentiel du biochar à augmenter la biodisponibilité du P dans le sol. Les objectifs spécifiques étaient de préciser l'influence de ...

La gestion de la matière organique du sol, un enjeu important pour limiter la lixiviation du nitrate vers les eaux souterraines

Description du sujet. La concentration en nitrate dans la moitié des masses d'eau souterraine de la région wallonne (Belgique) a justifié le classement de celles-ci en zone vulnérable, en application de la Directive Nitrates (DN). Cette zone vulnérable présente une diversité de contextes agro-pédologiques. Ainsi, le contenu en azote des sols agricoles peut localement varier d'un ...

Analyse Discriminante Des Difficultes D’apprentissage En Milieu Universitaire : Cas Des Etudiants De La Filiere Des Sciences Economiques Et De Gestion De l’UM5R

In a context of massification, students of open access programs in higher education encounter more learning difficulties than their counterparts of the regulated system. In the educational literature, these learning difficulties are mainly explained by deficiencies attributable to the students; their perception is seldom taken into account. This led us to explore such difficulties ...

Traitement Des Phosphates Naturels De Tahoua (Niger) Par Quelques Acides Conventionnels

Within the framework of upgrading natural phosphate of Tahoua, a study was carried out on the dissolution of ore by inorganic acid (sulfuric acid, nitric acid) and organic acid (citric acid) solutions according to pH and attack time. The obtained results show a sudden drop of dissolution rate at pH above 2 and a dissolution almost zero beyond pH 4. The kinetic study shows fast ...

Les Représentations De La Beauté Féminine: Une Lecture Des Fondements Socioculturels Du Teint Clair Chez Les Bété De Côte d’Ivoire

This study proposes an analysis of the representation of the female beauty whose clear complexion is one of the illustrations in the bété. In Côte d’Ivoire, the bété shows that there was a development of the beauty through the worship of the bagnon. However, in the representation of the male beauty through the bagnon, there is no fixed color complexion. It is not the same for the ...

Conflits Armes Et Representativite Ethnique Au Nord-Kivu En Republique Democratique Du Congo

The goal pursued in the present reflection is to analyze and explain the relationship of cause and effect between the persistence of armed conflicts and the issue of ethnic representation in political institutions in North-Kivu in Democratic Republic of Congo. Since the 1990s, is observed a systematic use of ethnicity in the calculations of political, economic and social actors ...

Les Intoxications Accidentelles Par Les Pesticides Au Maroc Entre 2008-2014: Evolution Et Facteurs De Risque

The aim of this study was to determine the epidemiological profile of accidental poisoning by pesticides. A retrospective study of poisoning cases, declared between January 2008 to December 2014 at the Moroccan Anti poisoning and Pharmacovigilance Center (MAPPC), was conducted. During the study period, 4 110 acute accidental poisoning by pesticides cases were collected. The average ...

La Réaction Des Cours Boursiers Suite À Une Nouvelle Annonce Des Entreprises: Cas De La Bourse Régionale Des Valeurs Mobilières (BRVM)

The purpose of this article is to highlight the reaction of share prices following the publication of dividends on the regional stock exchange (RSESS). To achieve the objective of our study, daily profitability series data were used over the period from January 1998 to December 2007. The methodology of the event studies was used and there are various ways to incorporate the "Event ...

Impact De L’exploitation Artisanale De La Sabliere De Toutsang Sur La Structure Des Communautes De Macroinvertebres Du Cours D’eau Doulahang A Dschang (Ouest Cameroun)

The impact of wastewaters from the Toutsang sandpit (Dschang), both on water parameters and on benthic macro-invertebrate community structure of the Doulahang stream was studied from March 2015 to February 2016 on a monthly basis in three sampling stations named TS1, TS2 and TS3. The physico-chemical analysis were carried out according to standard protocols while the benthic ...

Les Pathologies Chirurgicales Néonatales À l'Hôpital National De Lamordé De Niamey: Aspects Diagnostiques, Thérapeutiques Et Pronostiques

Purpose: The purpose of this study is to describe the characteristics of the newborn and its surgical pathologies managed in the service of pediatric surgery of the National Hospital of Lamordé. Patients and Methods: It is a retrospective and descriptive study within a period of 10 years (from January 1st 2007 till December 31st 2016). The epidemiological, diagnostic, therapeutic, ...