ST
Chargé de Cours
Activité scientifique
Profil chercheur
Enseignant-chercheur à l’Université de Yaoundé I. Grade : Chargé de Cours.
Publications scientifiques
Georges Martial Ndzana, Jeroen Meersmans, Li Huang, Tabi Fritz Oben, Etienne Mboua, Azinwi Tamfuh Primus et 6 autre(s)
Geoderma Regional
Georges Martial Ndzana, Jeroen Meersmans, B. Xue, Émile Temgoua, Etienne Bekoa, Bertrand Mungu Akam et 5 autre(s)
Moscow University Soil Science Bulletin
Abstract This study investigated and compared the morphological and physicochemical properties of a typical lithomorphic Vertisol and a Black soil, i.e., a topomorphic Vertisol around the Benoue river valley in Garoua, Northern Cameroon for optimal land management. Three pits were excavated along the vertical position of the Benoue River, and soil samples were collected and analyzed for various physicochemical properties. The results showed that soil profiles from both Vertisols were characterized by a clayey texture and a prismatic structure. The soil profiles presented the A horizon, B1t, B2t, B3t, and C horizon from the top to bottom. The Vertisols in the study area were slightly alkaline, with pH values ranging from 5.99 to 8.51. The available phosphorus (P2O5) content in the soil was generally low, indicating the need for phosphorus fertilizer application to enhance crop production. The organic carbon content in the soil was relatively high, ranging from 0.17 to 2.75%, and showed a difference between the lithomorphic and the topomorphic Vertisols. The total nitrogen content was moderate, and the soil was dominated by clay particles, followed by sand particles and silt particles. The high clay content in the soil suggests a potential soil structural constraint and the need for soil management practices that enhance soil aggregation and water infiltration. This study provides useful insights into soil management practices that enhance soil fertility, agricultural productivity, and environmental sustainability in Northern Cameroon. Future research should investigate other properties that may affect soil fertility and productivity.
Georges Martial Ndzana, Louise Marie Bondjè Bidjeck, Primus Azinwi Tamfuh, Alex Dortie Kolleh, Damien Henri Odigui Ahanda, Etienne Bekoa et 5 autre(s)
International Journal of Plant & Soil Science
Problem: Latosols of Liberia are marked by intense surface leaching, strong acidity, low soil organic matter (SOM) content, and low nutrients status, caused by low aggregate stability, which are limiting factors to crop production.
 Aim: to evaluate the effect of soil organic carbon (SOC) different forms of Fe and Al on the aggregate stability of latosols.
 Methodology: Composite surface (0-20 cm depth) samples of four latosols at different localities in Liberia (Lat1, Phebe; Lat2, Felela; Lat3, Salala; Lat4, Todee) were collected and analyzed for aggregate stability parameters and factors by standard laboratory methods.
 Results: the studied soils are sandy clayey, very acidic and poor in SOC. The cation exchange capacity (CEC) ranges from 10.28 to 14.80 mmol.kg−1. Dominant forms of Al and Fe are free Fe (Fed) and Al [1], followed by amorphous Fe (Feo) and Al (Alo) and chelated Fe (Fep) and Al (Alp). The highest levels of water dispersible clay (WDC) and clay dispersible index (CDI) in Lat1 and Lat2 implied that these two soils are less stable compared to Lat3 and Lat4. The Fe and Al in all forms seem to contribute to soil aggregate stability. The SOC, although very low, also contributes to soil aggregate stability. SOC correlated positively with WDC, CDI and ASC, indicating the impact of SOC both as an aggregating agent and as a dispersing agent, in contrast to previous studies.
 Conclusion: The study reveals that Fe, Al and SOC are cementing materials which impact the aggregate stability in Latosols.
Damien Henri Odigui Ahanda, Georges Martial Ndzana, Etienne Bekoa, Monique Abossolo-Angue Abane, Lucien Dieudonné Bitom
Journal of African Earth Sciences
Thierry Constant Engon, Monique Abessolo-Angue Abane, Philémon Zo’o Zame, Emile Ekomane, Etienne Bekoa, Kisito Mvogo et 1 autre(s)
Journal of African Earth Sciences
Georges Martial Ndzana, Alex Dortie Kolleh, Kashif Ali Kubar, Louis Marie Bondje Bidjeck, Etienne Bekoa, Primus Azinwi Tamfuh et 5 autre(s)
Journal of Geoscience and Environment Protection
The aim of this review is to investigate the application and latest developments of the Diffusive Gradients in-thin films (DGT) with a focus on the mobility and bioavailability of heavy metals in soil. Soil chemical extractions are extensively used to predict nutrients elements in the soil. However, these measurements have their weaknesses and shortcomings. Comparing DGT with conventional extraction methods, DGT is a sampling technique with significant advantages; including speciation capabilities, sensitivity, time-in- tegrated signal, low risk of contamination and time averaged concentrations. These findings have strengthened the usefulness of the DGT technique as a potential monitoring tool for soil with heavy metal contamination. Studies which have used the DGT technique to evaluate processes important to bioavailability have been booming in the last 13 years, especially its application in soils science. Some recent studies have shown a good relationship between the measurement of metals concentrations in soil and plant by DGT, and cohesive results have been obtained from these measurements when they are based on the DGT technique. DGT is a newly established procedure to assess the bioavailability of trace elements in sediments and soils, and its applications are still in the early stage of testing. Therefore, future application of DGT is likely to include the studies of HMs contamination in soil for risk assessment and transfer rates to the food chain, as some studies have indicated the potential of DGT in these areas.
Profil chercheur
Publications scientifiques
1 publication
1 publication
2 publications
1 publication
1 publication
Collaborations
