CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior / A pesquisa foi realizada com o objetivo de avaliar a decomposiÃÃo da folhagem de marmeleiro (Croton sonderianus), em funÃÃo da forma de acondicionamento e disposiÃÃo do material no solo na estaÃÃo seca e na estaÃÃo chuvosa. O experimento foi conduzido na Fazenda Experimental Vale do AcaraÃ, onde foram selecionadas duas Ãreas com 1 ha cada. Uma Ãrea apresentava a vegetaÃÃo preservada e a outra Ãrea sofreu aÃÃes antropogÃnicas. Foram acondicionados 30 g de folhagem de marmeleiro em 72 sacolas de decomposiÃÃo (que foram confeccionadas com malha telada de n 0 com 30 cm x 30 cm) as quais foram divididas em 3 tratamentos: sacolas com ambas as faces livres (A); sacolas com a face superior protegida por um plÃstico transparente (B), sacolas com a face superior protegida por lona branca (C). O delineamento experimental foi inteiramente casualizado em um arranjo fatorial de 3 x 2 x 2 x 2, sendo 3 tipos de sacolas x 2 Ãreas x 2 posiÃÃes x 2 estaÃÃes, com trÃs repetiÃÃes. Foi mensurada a temperatura ambiental, mÃxima e mÃnima, a temperatura do solo, assim como a umidade presente no mesmo, e a radiaÃÃo solar. As taxas de decomposiÃÃo real foram obtidas atravÃs de equaÃÃo, em que houve a subtraÃÃo da porcentagem inicial de biomassa vegetal pela quantidade restante nas sacolas ao fim de cada estaÃÃo. A forma de acondicionamento do material, as posiÃÃes em que os mesmos estavam assim como a influÃncia das estaÃÃes do ano e seus fatores abiÃticos caracterÃsticos, influenciaram na taxa de decomposiÃÃo da folhagem de marmeleiro, sendo que ocorrem maiores taxas de decomposiÃÃo na Ãrea preservada durante o perÃodo chuvoso. / The research was conducted to evaluate the decomposition of leaves of marmeleiro (Croton sonderianus), depending on the shape and arrangement of the packing material in the soil in the dry and rainy seasons. The experiment was conducted at the Fazenda Experimental Vale do AcaraÃ, where two areas were selected with 1 ha each. One area showed the preserved vegetation and other anthropogenic area suffered. Were placed 30 g of leaves of marmeleiro in 72 bags of decomposition (which were made with mesh screened from No. 0 to 30 cm x 30 cm) which were divided into three treatments: bags with both free surfaces (A); bags with the top surface protected by a transparent plastic (B), bags with the top surface protected by white canvas (C). The experimental design was completely randomized in a factorial arrangement of 3 x 2 x 2 x 2, and 3 types of bags x 2 x 2 locations x 2 seasons, with three replications. Was measured at ambient temperature, maximum and minimum soil temperature and the moisture present in it, and solar radiation. Decomposition rates were obtained by real equation, in which there was the subtraction of the initial percentage of plant biomass by the amount remaining in the bags at the end of each season. The form of packaging material, the positions in which they were as well the influence of the seasons and their abiotic characteristics, influence the rate of decomposition of leaves of marmeleiro, with higher rates of degradation occur in the preserved during the rainy season.