Chemical Properties of Travertine from Different Sources in Rwanda with Regards to Their Calcium Oxide and Magnesium Oxide Contents

This study was conducted in the districts of Rusizi, Korongi and Musanze districts, Rwanda in areas where travertine is found. The objective of the study was to characterize the chemical compositions of travertine for use in amending soil acidity for crop production. Thirty two samples of travertine from different deposits at Mashyuza (Rusizi), Gishita (Karongi) and Mpenge and Rwaza (Musanze) were analysed to establish their CaO and MgO contents. Percentages by weight of CaO and MgO in samples were determined using X-ray fluorescence. Results revealed that travertine from Mashyuza and Rwaza has the highest CaO wt% content followed by Gishyita. Mpenge deposits had the lowest content CaO% . There was no significant difference among sites for MgO contin travertine. The tratio of CaO:MgO in Mpenge, Mashyuza and Gishita was within a range required to prevent deficiency of Ca and Mg in acid soils where maize and beans are grown.
Cette étude a été menée dans les districts de Rusizi, Korongi et Musanze, au Rwanda dans les zones où on a trouvé le travertin. L’objectif de cette étude était de caractériser les compositions chimiques du travertin dans son utilisation pour modifier l’acidité du sol dans le cadre de la production agricole. Trente-deux échantillons de travertin de différents dépôts à Mashyuza (Rusizi), Gishita (Karongi) et Mpenge et Rwaza (Musanze) ont été analysés pour déterminer leur teneur en CaO et MgO. Les pourcentages en poids de CaO et de MgO dans les échantillons ont été déterminés à l’aide de la fluorescence des rayons X. Les résultats ont révélé que le travertin de Mashyuza et Rwaza avaient la plus haute teneur en CaO, suivi de Gishyita. Les dépôts de Mpenge avaient la plus faible teneur en CaO. Il n’y avait pas de différence significative entre les sites pour le MgO contenu dans le travertin. La concentration en CaO:MgO à Mpenge, Mashyuza et Gishita se situait dans un intervalle requis pour prévenir une carence en Ca et Mg dans les sols acides où les haricots et le maïs sont cultivés.
Extended abstract under Enhancing Natural Resource Management
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East Africa
RUFORUM Conferences and Workshops
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The 2012 RUFORUM Biennial Conference is the third in the series. The main objective of the Biennial conferences is to provide a platform for agricultural research for development stakeholders in Africa and beyond to actively exchange findings and experiences, while at the same time learning lessons towards improving performance of the agricultural sector and ultimately people’s livelihoods. The biennial conference is RUFORUM’s most comprehensive meeting for the diversity of stakeholders in agriculture. It is especially dedicated to graduate students and their supervisors, grantees in RUFORUM member universities and alumni. It is a platform for peer review, quality control, mentorship, networking and shared learning. The third Biennial Conference was attended by 657 participants. This record contains an extended abstract accepted under the theme Enhancing Natural Resource Management