This study investigates the potential of biofertilizer produced from the microalga Chlorella vulgaris to promote maize (Zea mays) growth, as a sustainable alternative to inorganic fertilizers. The research addresses the global challenge of increasing food production on limited arable land while minimizing environmental impact. Microalgae were cultivated using various substrates, including organic waste (poultry droppings and sewage) and inorganic components (NPK fertilizer), and processed into biofertilizer. These biofertilizers were applied to maize crops, and their effects on growth parameters such as plant height, leaf and shoot development, and biomass accumulation were monitored over a 90-day period. Results indicated that maize treated with C. vulgaris biofertilizer showed significant improvements in growth indices, comparable or superior to conventional inorganic fertilizer. Notably, organically cultivated maize demonstrated better shoot development and yield, with a 36% increase in plant height relative to controls. The study also highlights C. vulgaris's capacity to enhance soil fertility by supplying essential nutrients, reducing pollution, and supporting sustainable agriculture practices. The findings suggest that Chlorella vulgaris biofertilizer is a costeffective, environmentally friendly, and efficient alternative that can contribute to increased crop productivity and soil health, promoting sustainable farming systems.