Sugarcane (Saccharum spp.) is an efficient and sustainable alternative for energy generation compared to non-renewable sources. Currently, during the mechanized harvest process, the straw left in the field can be used in part for the second generation ethanol and increasing the electric energy production. Thus, this study aimed to provide information on the potential for residual biomass cultivars of sugarcane cropping system. This study provides the following information: yield of straw, depending on the calculated leaf area index and the number of tillers per linear meter; primary energy production of several sugarcane genotypes; contribution of dry tops and leaves; biomass yield; and evaluation of fiber, cellulose, hemicellulose and lignin. Preliminary results obtained by researchers of the State of São Paulo, Brazil, and reCviews related studies are presented. The results suggest that the production of sugarcane straw content varies according to the cultivars; the greater mass of sugarcane straw is in the top leaves and that the potential for the crude energy production of sugarcane per area unit can be increased using fiber-rich species or species that produce more straw. The straw indexes was shown to be a good indicator and allow the estimation of straw volumes generated in a sugarcane crop. The cellulose, hemicellulose and lignin composition in sugarcane is distinct among varieties. Therefore, it is possible to develop distinct biomass materials for energy production and for the development of sugarcane mills using biochemical processes and thermal routes.

Este artigo objetiva analisar a relação entre a disseminação voluntária de informações relevantes nos websites de empresas abertas com suas características, tendo como amostra 282 empresas não financeiras listadas na Bovespa. Com base na relevância de informações corporativas (financeira e de governança) avaliadas pelos intermediários de informações, que embasaram a constituição de índices ponderados de disclosure, os resultados sugerem que há maior disclosure: i) quanto maior a firma e quanto maior o retorno das ações da empresa; ii) em empresas de governança corporativa diferenciada; iii) em categorias de informações corporativas mais requeridas pelas agências de ratinge pelas corretoras; iv) em empresas mais endividadas.

The objective of this paper is to analyze the relationship between the voluntary disclosures of relevant information on the websites of a sample of 282 non-financial Bovespa-listed publicly-quoted companies. Based on the relevance of the corporate information (financial and governance) assessed by the information intermediaries and that provide the basis for constituting weighted disclosure indices the results suggest that there is more disclosure: i) the bigger the firm is and the bigger the return on company shares; ii) in companies that have a special type of corporate governance; iii) for those categories of corporate information that are more requested by the rating agencies and by stock brokers; iv) in companies with larger debts.