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Intercropping is the main farming method practiced in Haiti. It occupies more than 65% of the useful agricultural areas, with the dominance of cereals (maize, sorghum), cultivated mainly with legumes such as the cowpea. Poor farming practices is one of the main constraints encountered in this system, especially in terms of densities. The plants are grown at low seed densities, so finding an optimum density that promotes better yields is difficult.


In order to improve the yield and production of eggplant (Solanum melongena L.) by fertilization taking into account the problem of soil infertility, a lack of official recommendations on the use and optimal doses of fertilizers used and the low rate of their application in Haiti, this study was carried out on the fertilization of eggplant during the period from June to December 2019.


In Haiti, the presence of the various rice diseases in the fields, the yield losses caused by them and the control mechanisms have been very little studied. During the period from June to October 2019, a study was carried out in Saint-Marc, more precisely in Bocozelle in the locality of "DEZIRE", in order to study the behavior of four local rice varieties against the attack of certain fungal diseases in natural conditions in two different rice-growing systems (IRS: Intensive Rice Growing System; TRS: Traditional Rice Growing System).


The problem of planting density and irregular rainfall are two major constraints that farmers face in growing maize. Many farmers do not master the practice of planting density and cannot optimize their yields. To this end, a study on the effect of different planting densities and mulch on the agronomic performance of three varieties of "zea Mays" maize was carried out in the commune of Croix des Bouquets in the locality of Digneron with the aim of finding which combination of density and mulch will optimize yield.