Continuing the series on organic farming, Down To Earth's reporter found that both the scientific community and farmers are showing interest in using biofertilisers and vermiculture to substitute for chemical fertilisers. Microorganisms like algae are used as biofertilisers and earthworms not only turn up the soil but are also a rich source of manure. With increasing demand for natural fertilisers, some municipalities have started composting urban waste and selling it as manure. In addition, growers of organic food are finding an expanding market in the West for their produce.