To ensure the sustainability and productivity of the cocoa crop, replanting on non-forested sites such as old orchards or young fallow lands raises the problem of the survival and establishment of seedlings, due to the low fertility of the soil, particularly in phosphorus. Thus, in order to minimize mortality and improve juvenile growth and flowering precocity of cocoa trees, organic, mineral and organo-mineral fertilizers were applied to a fallow land with low phosphate fertility, in Soubré, in the southwest of Ivory Coast. The experimental design was a partially balanced incomplete block design with 12 treatments and three replications. The treatments consisted of two fertilizer applications per year for each plant: compost (T1); phospho-compost (T2); TSP + compost (T3 and T4); NPK based on natural phosphates (T7, T8 and T9), combined with compost (T5 and T6) or phospho-compost (T10 and T11) at different doses. Growth parameters and flowering were evaluated. Treatments T2 (phosphocompost 1 kg), T3 (TSP 75 g + compost 2 kg) and to a lesser extent T11 (NPK 0-15-15 300 g + phospho-compost 1 kg) were the most efficient. They allowed a better growth, a good precocity of crowning and flowering. All the treatments tested did not impact the mortality rate of young cocoa trees. These results could allow farmers to exploit favorably soils with low fertility, with the guarantee of a good establishment of cocoa plants in the field during the juvenile stage.

A study on the mineral and liquid organics fertilizations was conducted on tomato (Solanum lycopersicum L.) during short rainy season in South and Central West regions of Ivory Coast over two years to improve soil fertility and tomato yield. specifically, the treatment effects of four doses of organic fertilizer, associated or not with the mineral fertilizer on the content of the soil organic matter, the C/N ratio and the yield. The experimental design was split-plot, with four repetitions having as principal factor, the mineral fertilizer and the secondary factor, the organic fertilizer in four doses (L ha-1): C0 = 0 (control); C1 = 2.5; C2 = 3.75 and C3 = 5. The results showed that the treatment T10 (50 % mineral fertilizer + 3.75 Lha-1 of the organic fertilizer), better improved the content of the soil organic matter and the yield. However, the treatment with 3.75 L ha-1 of organic fertilizer used alone has of increased advantage the report C/N of the ground.