Vol. 6, Issue 4, Part C (2020)

Abstract
These last few years, eggplant production in sub-Saharan African countries has declined due to scarcity and depletion of arable land, while domestic demand and exports are high.In order to provide substrates that will improve the production of eggplants by using residues from the forestry and agricultural industries like the coconut fiber (CF), cocoa pod hull (Cph) and the Samba tree sawdust (SS), available and cheaper as growing medium. Seeds of Gboma-eggplant (Solanum macrocarpon) were sown in a nursery on the soil of the Université Jean Lorougnon Guédé field of experimentation. 39 plants of 40 days after sowing from this nursery were transplanted into 4 dm3randomized pots containing the substrates, soil, CF, Cph and SS; for thirteen treatments in monosubstrate (100 % substrate) or with combination organic substrate/soil (25; 50; 75 % substrate/soil 75; 50; 25 %), with three replicates. The results of this study revealed a significant difference (P <0.05) between the substrates. All coconut fiber (CF) treatments showed better vegetative parameters (plant height from 77.33 to 81 cm and fruit length from 9.53 to 10.66 cm) and important yields average (YA) from 32.25 to 58.24 t/ha, followed by the Samba sawdust (SS) all combinations (plant height from 66.66 to 69.33 cm and YA 24.84 to 45.53 t/ha).Cocoa pod hull (Cph) 100 % exhibited medium vegetative growth and a yield of 33.98 t/ha, but Cph 25 % was not good and has facilitated the withering and death of the plants and should be tested in combinations with other organic substrates.