Application of Cassava-Peels and Palm-Oil-Sludge Digestate on Bean Crop for Sustainable Growth

This study investigates the potential of using digestate, a byproduct of anaerobic digestion, as organic manure in sustainable agriculture. The digestate was processed using a constructed screw press, separating it into liquid and solid components, with the liquid stored at room temperature and the solid subjected to a 20-day solar drying process. Four experimental conditions were tested: a control group, soil with chemical fertilizer, soil with solid digestate, and soil with liquid digestate. A fertilization rate of 1 gram per kilogram of soil was used. Over two months, distinct growth patterns emerged, with the liquid digestate group showing the most significant advantages, concluding with 59 leaves compared to 46 leaves in the solid digestate group, 44 in the chemical fertilizer group, and 42 in the control group. However, statistical analysis indicated no significant difference between treatments (p-value: 0.9451). The liquid digestate group also demonstrated superior stem width and crop yield, achieving a total yield of 99 bean seeds. The study highlights the promise of integrating digestate as organic manure in sustainable agriculture. The use of an anaerobic digester and screw press offers a viable solution for waste-to-resource conversion. Despite the encouraging results, further research is recommended to optimize digestate composition and application methods tailored to specific crop needs. This research contributes to eco-friendly agricultural practices and supports the advancement of sustainable waste management and crop cultivation strategies.