Browsing by Author "Sous la direction de : Dr. Rucakumugufi Daniel (Directeur)"

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    Essai d’amélioration de la teneur en phosphore des composts produits par co-compostage des pailles de riz et d’adjuvants organiques avec les phosphates naturels de Matongo
    (UB, FS, 2025-01) Igiraneza, Fulgence; Sous la direction de : Dr. Rucakumugufi Daniel (Directeur); Prof. Kaboneka Salvator (Co-Directeur)
    The improvement of phosphorus availability in agricultural soils is a major challenge for soil fertility and the optimization of crop yields. However, the use of Matongo natural’s phosphates is limited due to their low solubility. This thesis presents a study on enhancing the phosphorus content of composts obtained through the co-composting of tithonia diversifolia and rice straw with various organic additives, including pig manure, poultry droppings, and cow dung, in combination with Matongo phosphates. The main objective of this research is to optimize the valorization of agricultural waste while increasing soil fertility through phosphorus-enriched composts. Initially, an analysis of the physicochemical characteristics of raw materials was conducted to determine their composting potential. Then, several compost formulations were developed, varying the types of input combinations. The resulting composts were subjected to maturation tests and phosphorus content analysis. The results recorded for the control compost samples: E450, E591, and E603 were respectively: 1.05±0.120% P₂O₅; 0.88±0.042% P₂O₅; and 0.69±0.245% P₂O₅. Meanwhile, the composts enriched with Matongo phosphates (E101, E205, E308, E708, and E805) showed the following phosphorus content: 3.56±0.035% P₂O₅, 2.99±0.071% P₂O₅, 3.42±0.081% P₂O₅, 3.12±0.056% P₂O₅, and 3.14±0.070% P₂O₅, respectively. The results indicate that adding Matongo phosphates, in combination with organic additives, significantly increases the phosphorus content of the composts. Physicochemical parameter analyses, heavy metal assessments, and phytotoxicity tests were conducted on the produced composts to evaluate their stability and maturity. Except for lead (Pb) content, which exceeds the quality standards for compost intended for fertilization, all other tested parameters comply with the established quality standards for high-quality compost. Among the tested additives, the cow dung adjuvant proved to be a better phosphate solubilizer than the two others adjuvants tested. This study contributes to the valorization of agricultural residues and the sustainable management of resources while addressing the growing need for phosphorus-rich organic fertilizers in agriculture. The findings of this research open up promising perspectives for the development of innovative and sustainable composting practices.