The mode of spatial distribution of Ficathoa laurifolia and Ocotea usambarensis species has been treated in the game reserve of Kalikuku, Lubero Territory. In order to reach the result, we have delimited a plot for each species and in which we have carried out the sampling of diameter critter at «DHP» of each target tree according to our criterion, and the distances which could separate the individuals as they moved closer to one another, following the method called: Nearest Neighbor Method. That means the method of the neighbor that in very near, of Clark and Evans. The results that we have found are the following. The aggregation clue R has given 0,86 for Ficalhoa laurifolia, 1,5 for Ocotea usambarensis and -3,6 for Piptadeniastrum africanum. After the application of test Z of spatial deviation, Z has given - 4,12; 12,6 and -3,6 respectively for restoring it and aggregate distribution and even Ocotea usambarensis towards unpredictable or aleatory distribution, Piptadeniastrum africanum as an aggregate. The diametric structure of the three species presents a curve in form of bell «Gauss» in the base classes to decline from the beacon classes presenting then a curve in form of reversed j, witness of a natural forest. The very great land surface for Ficalhoa laurifolia has been of 19,8398 m2 in the fourth class of diameter, 4,2398 m2 in the class for Ocotea usambarensis and 26,679 m2 of Piptadeniastrum africanum in the third class.

The cocoa tree (Theobroma cacao L.) is an economically, nutritionally and socially important crop. Currently, this culture is at the center of scientific debate because it is indexed to play a significant role in the phenomenon of deforestation observed in humid tropical regions. In order to contribute to its expansion while minimizing forest losses and protecting the environment, agroforestry systems integrating herbaceous or woody flora species have emerged as a better alternative. In this perspective, this study constitutes a contribution to the valuation of shade trees in the cultivation of cocoa while maintaining intact its productivity in the territory of Lubero. The objective of the study is to study the influence of shade trees on the morphometric parameters of pods in the ecological environment of Buyinga. To achieve this objective, observations were made at nine cocoa plantations chosen according to their degree of shade. With the exception of the number of pods per stem, the results show that there is a very highly significant difference in the means of the length of the pods, the circumference of the pods and the number of beans per pod in the plantations according to the degree of shading (p-value<0.05). Indeed, the average lengths of the pods are 24.83 ± 4.11 cm in moderately shaded plantations, 22.61 ± 4.38 cm in heavily shaded plantations and 19.20 ± 2.69 cm for plantations without shade (in broad daylight). The average circumferences of the pods are respectively equal to 27.99 ± 3.41 cm for plantations with medium shade, 26.47 ± 2.5 cm for plantations without shade and 26.46 ± 3.49 for plantations with strong shady. The average number of beans per pod is 38.95 in plantations with medium shade against 38.53 beans per pod for plantations without shade and 26.5 beans for plantations with strong shade. Despite the absence of significant difference in the number of pods per stem according to the degree of shade, cocoa plantations growing under medium shade induced a high number of pods per stem compared to other plantations. The average number of pods per stem is around 25.8 ± 7.25 for plantations with medium shade, 23.89 ± 6.03 for plantations with strong shade and 21.51 ± 7.44 for plantings without shade.

Faced with the current trend of rising food insecurity and chronic diseases in urban areas, the adoption by farmers of plants with nutritional and medicinal properties in urban agriculture becomes one of the solutions to this challenge. Currently, chia (Salvia hispanica L.) is one of the crops attracting attention because of its nutritional, medicinal and cosmetic properties. Thus, this study pursues a double objective, namely to study the perceptions of farmers in City of Butembo on this crop and to evaluate the effectiveness of the application of logistic regression. Binary and multinomial logistic regression models were constructed based on data collected from a simple random sample of 120 farmers. This study shows that for a farmer, the knowledge of the chia plant, the consumption of the seeds, the knowledge of the nutritional and medicinal virtues of its seeds, the opinion to undertake this culture, the perception on the evolution of the demand at the market level and the adoption of this crop in urban agriculture vary according to socio-demographic characteristics. The study also shows that logistic regression provides better overall precision, acceptable error rates and moderate Cohen's Kappa coefficients.