Proximate and elementary analysis of plantain peel ash for use as fertilizer

Abstract

The study investigated the proximate and elemental composition of plantain peel ash to assess its potential as an organic-based fertilizer. Plantain peels collected from local markets were dried, burnt under controlled conditions to obtain ash, and analyzed using standard procedures. Proximate analysis revealed a high ash content (89.15%), low moisture (3.62%), and minimal organic fractions (protein, fat, and fiber), indicating a stable, mineral-rich material suitable for soil enrichment. Elemental analysis showed that potassium (35,420 mg/kg) was the dominant nutrient, followed by calcium (9,830 mg/kg), magnesium (2,740 mg/kg), and phosphorus (1,960 mg/kg). Trace amounts of iron (Fe) and zinc (Zn) were also detected. These results demonstrate that plantain peel ash contains essential macro- and micronutrients capable of improving soil structure, enhancing nutrient availability, and promoting crop growth. The high mineral and alkaline nature of the ash supports its use as an eco-friendly, low-cost soil amendment for sustainable agriculture. However, field trials are recommended to determine its agronomic efficiency and long-term effects on soil fertility.