The correct answer is Sunn-hemp. Sunn-hemp is most suitable for loamy soils. It is sown in May or June when the monsoon breaks. It grows very fast and to a height of 1 to 2 metres. It can grow even on poor soils and ads about 20 to 25 tons of fresh green plant material per hectare to the soil. It is the most outstanding green manure crop and is well suited in almost all parts of India. It fits in well with the sugarcane, potato, garden crops and the second season paddy in southern India and with irrigated wheat in the north India. Dhaincha, Sunn-hemp are legume green manure crops. Whereas Gliricidia, cassia are legume green leaf manure crops.