Guety Thierry Philippe^1,, Brahima Koné¹, Koné Aminata², Boidi Hien Marie Paule¹, Kanaté Ladji³

Peat soils are a valuable agroecosystem because of their rarity in Africa (< 4%) and their high carbon sequestration capacity (3% C), which is nevertheless disturbed by farming. It is therefore necessary to explore regenerative agricultural practices as part of organic farming. An agronomic trial was set up on peaty soil in Songon (west of Abidjan) to test doses of aqueous Costus afer extracts on the growth and production of flood rice and soil properties. Five (5) doses (0, 250, 500, 750, and 1000 liters/ha) of fermented aqueous extracts (6 months) of Costus afer were applied in a randomized complete block design in three replications with 6 treatments (T0, T1, T2, T3, T4, T5) and the rice variety VA6 was transplanted at a spacing of 20 cm × 20 cm. Rice growth and yield parameters were collected. The results obtained showed a greater number of tillers (324/m²) and greater heights were noted for T1, contrasting with a relatively lower weed biomass for the higher doses (T4 and T5), with a significant effect (P<0.05) at different physiological stage of the rice. No significant difference was observed between yields, although T5 (7.58 t/ha) outperformed the control (T0) by 49%. However, a dose of 649 l.ha-1 is required for better rice yields.

agroecosystem, biofertilizer, organic farming, rice cultivation, peat soils, Côte d'Ivoiree