In fl uence of lime and gypsum application on soil properties and yield of cassava ( Manihot esculenta Crantz .) in a degraded Ultisol in Agbani, Enugu Southeastern Nigeria
In fl uence of lime and gypsum application on soil properties and yield of cassava ( Manihot esculenta Crantz .) in a degraded Ultisol in Agbani, Enugu Southeastern Nigeria