Abstract

• Organic fertilizers are easily biodegradable and do not affect environmental pollution. They are carbon-based compounds that can increase the productivity and growth quality of plants. They have various benefits over chemical fertilizers. In this research, four organic fertilizers were prepared using kitchen vegetable wastes with peanut meal cake (OF-1, OF-2) and kitchen vegetable wastes with sesame meal cake (OF-3, OF-4) under aerobic and anaerobic conditions. The physicochemical properties of prepared organic fertilizers such as pH value, moisture content, available phosphorus content, available potassium content and organic carbon content were determined. The available nitrogen content in prepared organic fertilizers was measured by alkaline permanganate method. The results from determination were compared with two commercial organic fertilizers. The amount of available nitrogen in OF-1, OF-2, OF-3 and OF-4 were 1.67 %, 1.57 %, 1.45 % and 0.88 % respectively. The available nitrogen content of all prepared organic fertilizers was found to be higher than those of two commercial organic fertilizers. The carbon- nitrogen ratios of the prepared organic fertilizers were calculated. The results from prepared organic fertilizers showed that aerobic condition gave high efficiency. Furthermore, the elemental analysis of four prepared organic fertilizers was examined by EDXRF (Energy Dispersive X-ray Fluorescence) spectroscopy. Silicon was found to be the highest value in all prepared organic fertilizers.