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The Radioisotope Laboratory is a research laboratory directly attached to the Presidency of the University of Antananarivo. The laboratory carries out various high-level scientific research activities, training and expertise in two major fields: medicine and agronomy.

In the medical field, the disciplines we study are primarily biophysics and physiology . Our research activities are based on the use of isotopic techniques applicable in nuclear medicine and the use of stable isotopes: in vitro studies of labeled red blood cells in patients with polycythemia, exploration of clearances and compartments, in vitro confirmation of occult gastrointestinal bleeding using isotopic techniques, and other isotopic techniques such as those for hormones (T3, T4, TSH, insulin, proinsulin peptide (RIA or IRMA assay), tumor markers (CA 15-3, thyroglobulin, etc.)), in other medical fields (nutrition, cardiology, diabetology, etc.). These activities are conducted in partnership with the Faculty of Medicine and other financial partners such as the IAEA.

For the agronomy component, the disciplines studied are primarily soil science, environmental science, soil biology and ecology, agronomy, and forestry . Research activities mainly focus on three areas:

The "soils and climate change" axis : where we study the impacts of different land uses and agricultural practices on carbon sequestration in soil and plant biomass. We study the parameters that control this sequestration at different scales.
The "nutrient bioavailability" axis : where we study the processes of making soil nutrients available to the plant through the improvement of cultivation practices and the use of different soil-root-plant interactions.
The " soil biology" research area, which is transversal to the two previously mentioned areas, studies the role of different soil organisms (soil fauna, microregulators, and soil microorganisms) in making nutrients available to plants and in mitigating climate change through their actions on the carbon cycle. We conduct this research area in close collaboration with the IRD's Eco&sols Joint Research Unit.

To this end, we use various methodological tools such as modeling and mapping at different scales (regional, national, local and plot) and we participate in the development of methodological tools for decision-makers or civil society for better appropriation of the results from our research work (case of REDD+ or the 4 per thousand initiative).

We carry out our activities in close collaboration with various international research institutions (such as IRD, Cirad, INRA, JIRCAS, Bangor University, VLIR, etc.) and national institutions (such as ESSA, FOFIFA, FIFAMANOR, ANAE, etc.) and farmers' associations.

We conduct our research activities through collaborative research projects and annually host around ten doctoral students and twenty Master's students on the aforementioned topics.

We have a highly functional analytical platform for various soil and plant analyzes and a team of skilled technicians to carry out these analyses.

Actualites du L.R.I

Estimation de la capacité de rétention en phosphore du sol par la mesure de la teneur en eau du sol séché à l’air

1. Objectif Cette procédure décrit une méthode permettant de mesurer la teneur en eau du sol séché à l'air, ce qui est utile pour estimer la capacité de rétention en phosphore du sol. Afin de minimiser l'influence de l'humidité atmosphérique, la…lire la suite

Soutenance de thèse : Sariaka RAHARIJAONA

Sariaka RAHARIJAONA a soutenu publiquement sa thèse le 24 Octobre 2022 au Laboratoire des Radioisotopes, Andraisoro, Antananarivo, Madagascar; et en visioconférence avec Dr Pascal JOUQUET, Chargé de recherche à l'IRD-Cambodge, Dr Camille CHAUVIN de…lire la suite

Les produits académiques du projet Fy-Vary SATREPS sur Thèses malgaches en ligne

Le projet Fy-Vary va bientôt se terminer. Ce projet, financé par le JICA avec des partenariats entre le JIRCAS le MINAE, FOFIFA, l'ONN et l'Université d'Antananarivo à travers le Laboratoire des RadioIsotopes a permis de produire différents…lire la suite

Le LRI représenté lors de la célébration des Journées Internationales des Mangroves à Nosy Be 24-26 Juillet 2022

Le projet PEER USAID Cycle 8 : « Improving mangrove forest carbon and socio-economic data to improve management in Madagascar » est un projet de recherche multidisciplinaire, co-dirigé par le LRI et l’United States Services (USFS) avec d’autres…lire la suite

Estimation of rice response to P fertilizer application using soil P retention capacity

Rice response to P fertilizer application can be estimated by soil P retention capacity. This enables farmers to apply fertilizer efficiently as following the estimated rice response to P fertilizer based on soil P retention capacity. Read more... lire la suite

Estimation de la réponse du riz à l'application de l’engrais phosphaté, en utilisant la capacité de rétention en P du sol

La réponse du riz à l'application de l'engrais phosphaté peut être estimée par la capacité de rétention en phosphore (P) du sol. Cela permet aux agriculteurs d'appliquer les engrais d`une manière efficace, comme le montre l'estimation de la réponse…lire la suite

Optimum use of Farmyard Manure in paddy lowlands

Optimum use of Farmyard Manure (FYM) in paddy lowlands of central highlands

FYM is effective to improve the grain yield under P-deficient soils. In addition, under low P condition, we recommend the consecutive FYM application and/or the combined application with N fertilizer for further yield improvement. Since higher P…lire la suite

Utilisation optimisée de fumier de ferme (FYM) dans les rizières de hautes terres

FYM est efficace pour améliorer le rendement en riz dans les sols P déficients. Par ailleurs, sous faible condition phosphatée, nous recommandons l’application continue de FYM et/ou l’application combinée avec le fertilisant azoté pour une…lire la suite

Soutenance de thèse : Seheno RINASOA

Seheno RINASOA a soutenu publiquement sa thèse le 21 Décembre 2021 au Laboratoire des Radioisotopes, Andraisoro, Antananarivo, Madagascar; et en visioconférence avec Dr Tomohiro NISHIGAKI du JIRCAS-Japon et Prof. Erik SMOLDERS, KU Leuven-Belgique…lire la suite

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