A farmer grows ground nuts, elephant grass, millet and cassava stem cuttings. He also rears cattle. He...

55. A farmer grows ground nuts, elephant grass, millet and cassava stem cuttings. He also rears cattle. He wants to improve soil fertility without using fertilisers.
(a) Identify the crop you would advise this farmer to grow in order to improve soil fertility.
(b) Mention any two factors this farmer should consider before planting the cassava stem cuttings.
(i)
(ii)
(c) Give any one reason why this farmer planted elephant grass on his farm.