Green manure is obtained from decomposing green legume plants. Green manure is a practice used in agriculture where certain plants, such as legumes, are grown and then incorporated into the soil while they are still green and actively growing. These plants are usually nitrogen-fixing, which means they have the ability to convert atmospheric nitrogen into a form that can be used by other plants. By incorporating these green legume plants into the soil, they add organic matter and nutrients, particularly nitrogen, to the soil, improving its fertility. Animal excreta, domestic vegetable waste, and oil seed husk cakes are not typically used as green manure. Instead, they may be used as compost or other types of organic fertilizers in agricultural practices.