Karanja oil cakes, derived from the seeds of the Pongamia pinnata tree, are nutrient-rich residues beneficial for agriculture and environmental sustainability. They serve as a dual-purpose organic fertilizer and natural pesticide, enriching soil with nitrogen, phosphorus, and potassium while repelling pests like nematodes. By enhancing soil structure and promoting microbial activity, they offer a cost-effective and eco-friendly alternative to chemical inputs, supporting sustainable farming practices.