Objective: Maize is a crop whose grains are involved in the diet of West African populations, and also in the food of the populations of the Korhogo region. However, the yield of this crop is still low in the region. The study was initiated to help increase maize production by assessing the effects of different types of mineral and organic fertilisers on maize yield. The study was conducted, for 6 months, on the experimental site of the University Peleforo Gon Coulibaly of Korhogo, located in the north of Côte d'Ivoire.

Abstract-The carrot (Daucus carota) is a biennial plant

Very popular for its therapeutic and nutritional virtues, culture of carrot (Daucus carota) has developed in temperate zones of Asia and Europe but also in some tropical regions of Africa including Côte d'Ivoire. Agronomic factors, commercial and food requirements require selection of varieties with good nutritional values. In this study, physicochemical properties and nutritional values of four carrot varieties namely Amazonia, Bahia, Madona and Pamela+ were compared after cultivation and harvest in region of Korhogo. Results showed that, Amazonia, the control carrot variety stands out for its acidity and minerals levels. Bahia is the richest variety with high levels of carbohydrate and protein. Madona is the most basic, wettest and fatest carrot. For a long storage, Pamela is most interesting variety. To our knowledge, it is the first time that physicochemical and nutritional parameters of carrot varieties in region of Korhogo have been studied. Future research on these carrot varieties will be studied of their post-harvest conservation, their sensory analysis and their transformation.

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The yield of sorghum grains, despite its importance in feeding the populations of northern Côte d'Ivoire, is still very low. This study was initiated with the objective of contributing to the improvement of sorghum production by evaluating the effects of different types of mineral and organic fertilizers in improving the growth and yield characteristics of the said crop. The study was conducted in the municipality of Korhogo, following a Fisher block device, comprising 7 treatments and 4 repetitions. The 7 treatments studied included three types of mineral fertilizers (Yara Mila Actyva type and two NPK types, with surface and micro-dose applications), three types of organic fertilizers (cow, rabbit and chicken droppings) and the control without fertilizer. The results, obtained, showed that the growth and yield characteristics were improved by the NPK types and the poultry and rabbit droppings brought in. These two types of fertilizers, with average productions of ears, varying between 1.6 and 2.5 ears per plant gave the best productions. Organic fertilizer, based on cow bursa, and the control did not significantly improve the production of sorghum. In a context where the high price of mineral fertilizers is very often a brake on the intensification of crops, this study constitutes a contribution to fertilization through the use of organic fertilizers and adapted to the socio-economic conditions of the region, knowing the low income of farmers.