Growth and Biochemical Performances of Two Cassava (Manihot esculenta, Crantz) Varieties to Crude oil Polluted biostimulated Soil.

Growth and biochemical performances of two varieties (NR 8082 and TMS 30572) of Manihot esculenta; Crantz (cassava) in a crude oil polluted soil biostimulated with both organic and inorganic fertilizers were carried out. 5kg soil polluted with 250ml of crude oil were remediated with 20g NPK 15:15:15, 50kg poultry droppings and 10g NPK15:15:15 + 30g poultry droppings (combined) alongside a control (polluted soil but no remediation). After two months post-biostimulation, two stem-cuttings of each of the two cassava varieties were planted in each remediation treatment with 12 replicates each and allowed for 20 weeks. Results showed that addition of these biostimulation materials (NPK and poultry droppings) to the crude oil polluted soil improved the growth and biochemical performances of the two varieties. Highest significant (p=0.05) yields, especially the shoot length, fresh weight and dry weight yields were recorded in the NPK 15:15:15 treatment option while the control recorded the least. Result also showed that the treatment in combined form had no advantage over the single treatments in terms of growth and biochemical performances. Therefore, NPK 15:15:15 and poultry droppings are good biostimulation materials for the remediation of crude oil polluted soil for cassava cultivation, and NPK 15:15:15 (inorganic fertilizer) appeared to be a better treatment option than poultry droppings (organic fertilizer.)