Influence of reasoned organic and inorganic fertilization on okra ( Abelmoschus esculentus ) growth, productivity, and profitability on degraded sandy soil in South Togo

Reasoned fertilization practices promote fertilizers formula adjusted to the crop’s needs and increase production and income. In this study, two agronomic tests were carried out on two sites named Tabligbo (site 1) and Djikame (site 2) on degraded sandy loam soils situated in the south of Togo using inorganic and organic fertilizer quantities obtained from reasoned fertilization. An indigenous variety of Abelmoschus esculentus was used and five treatments were applied: T2: mineral fertilizer (667 kg/ha), T3: waste compost (6126 kg/ha at Tabligbo and 7260 kg/ha at Dzikame), T4: mineral (333.50 kg/ha) + compost fertilizers (3063 kg/ha for site 1 and 3630 kg/ha for site 2), control (T0) and smallholder farmers’ old fertilization practices (T1). At Tabligbo, treatments T2 and T4 stimulated quick growth (74,5 ± 03.50 cm) and the highest number of fruit was obtained on T4 treatment (102 ± 09). At Djikame, treatments T2 and T3 presented the highest growth (65.82 ± 2.51 cm) and the T4 treatment gave the best number of fruits (72 ± 4.00). Economic Efficiency and Cost-Value Ratio were high on the T4 formula on Tabligbo soil (53.48% and 1.85). At Djikame, treatment T2 presents the highest value of economic parameters (24.52% and 01.35). Among treatments tested, T4 (compost + mineral fertilizer) is the effective treatment on Tabligbo sandy loam soil for okra production while the T2 (mineral fertilizer) option is the best for okra production on site 2 due to the low content in nitrogen increasing C/N ratio. The effective fertilizer formulas discovered in this study will be shared with farmers in the study areas in order to improve market garden crop production in South Togo.