Rice farming in the Cote dIvoire faces enormous constraints, including that of adventitious management. A study on rice adventitious was conducted with the objective of inventorying rice adventitious as well as herbicides that are used for chemical control in the city of Daloa. Thus, 60 rice growers selected at random and from three (3) bunds representing plots of approximately four (4) meters were randomly selected. In each plot, all the weeds met were identified as well as the herbicides used by the rice growers. Floristic surveys have identified 34 species divided between 30 genera and 15 families. The most represented families are the Poaceae, Cyperaceae, Asteraceae, Euphorbiaceaes and Amaranthaceae. A total of 14 herbicides have been identified and their choice by the rice grower is essentially guided by the experience of rice growers on their effectiveness. We have counted as for the herbicides used, 2,4-D amine salt and glyphosate because of their large spectrum of action on weeds.

Several surveys and inventories were conducted with surface survey method using plots, measuring 200 m 2 and supplemented with mobile method in Sucrivoire Voluntary Natural Reserve on the right bank of the Bandama river. The analysis of the data collected focused on diversity and floristic richness and used phytoecological methods such as the ACP. The obtained results concern 200 identified botanical species among which 81 % of dicotyledone and 19 % of monocotyledone belonging to 152 genera and 56 families. The ecological factor most pronouncement being the toposequence, the determination of the diversity indices of various strata showed that for each of it the flora is very diversified and homogeneous in general such as indicated by the coefficient of similarity of Sørensen which remains upper to 50 %. However, this flora is dominated by the families of Euphorbiaceae, Poaceae, Rubiaceae, Mimosaceae, Asteracea e, Caesalpiniaceae and Sterculiaceaes which characterize his phytogeographique position. In this floral diversity, the ACP revealed a single group of floral procession, which mean that the three strata constitute a single forest block dominated by Phanerophytes in 66,33 % and containing 12 species with particular status and 17 species considered as commercial forest essences. All these characteristics confirm the good state of preservation of the flora of the right bank of the Bandama river set up as a Voluntary Natural Reserve by Sucrivoire. This sugar canne structure so makes the flora of this site one of the reservoir of biodiversity of the future green frame of Côte d'Ivoire.

The aim of this work is to contribute to the study of wild edible Psathyrelles in Côte d'Ivoire. It was conducted in the region of Daloa, a forest area with a tropical climate favorable to the development of fungal species. Data collection took place during the rainy season (April-July). The carpophores were photographed before harvesting in order to observe the macroscopic characters on the different samples. The microscopic study was conducted in the laboratory to observe the reproductive organs. The different specimens were dried afterwards for further observations. The results indicate that five (5) fungal species were collected, they are: Psathyrella caput-medusae (Fr.) Konrad & Maubl., Psathyrella candolleana (Fr.) Maire, P. tuberculate (Pat) A. H. Sm, P. atroumbonata Pegler and P. piluliformis (Bull. ex Fr.) P.D. Orton. P. tuberculata, P. atroumbonata and P. piluliformis have already been cited in Côte d'Ivoire. P. candolleana and P. caput-medusae were described in this work for the first time.

The present study aims to determine the spatial gradient of organic matter in soil-litter mixtures as a function of the distance to iroko associated with cocoa trees. The demonstration of the preservation of iroko is carried out thanks to a floristic inventory and a survey ethnobotany from 323 farmers. The fertility of cocoa-growing soils was estimated using spatial organic matter measurement in 12 cocoa plantations of 1,5 to 2 ha associated with iroko. A total of 48 composite litter samples were collected at 20 cm along the spatial gradient of the iroko at distances of 1-2 m, 2-4 m and 4-6,5 m and then in the control (without iroko). With 73% of citation, populations are favorable to its preservation in cocoa agroforests. Prized for its artisanal and medicinal uses, it improves soil fertility outside the shade provided to cocoa trees. Its average organic matter content in cocoa-growing soils is very significant. The spatial gradient of M. excelsa has had a significant impact on the amount of organic matter less than 6% in the iroko rhizosphere while it reaches 6 to 8% in cocoa trees. Its preservation in cocoa trees contributes to improving the properties of poor soils. However, differential processes ultimately affect the decomposition rates of organic matter, hence the separation of cocoa trees by at least 10 m to benefit from the supply of carbon, nitrogen and phosphorus ions.