Uses of cow dung Fertilizer: Cow dung is a rich source of carbon and nitrogen, which helps increase soil fertility. Fuel: Cow dung can be burned as fuel. Mosquito repellent: Cow dung can be used as a mosquito repellent. Cleansing agent: Cow dung can be used as a cleansing agent. Flower and plant pots: Cow dung pots are biodegradable and eco-friendly.