RESUMOThe objective of this research was to identify and characterize the main technical factors that affect the deployment of the mechanized harvesting of sugarcane in Campos dos Goytacazes, Rio de Janeiro, Brazil. In general, it can be stated there were restrictive factors related to machinery, administrative management, and technical planning. We identified significant technical restrictions in the planting system, particularly in relation to the size and shape of the plots, length of the rows, row spacing, and inadequate varieties. For efficient use of mechanized harvesting, a technical planning is necessary with changes in the cropping system, adopting wider and more uniform plots regarding to its format, with rows over 500 m length and row spacing of 1.50 m and upright, productive, and deep-rooted varieties.Key words: management of mechanized operations; technical and field aspects. Fatores limitantes da implantação na colheita mecanizada da cana-de-açúcar em Campos dos Goytacazes, RJObjetivou-se identificar e caracterizar os principais fatores técnicos que afetam a implantação do sistema de colheita mecanizada no Município de Campos dos Goytacazes, RJ. De maneira geral, pode-se afirmar que existem fatores restritivos relacionados às máquinas, à gestão administrativa e planejamento técnico. Identificaram-se importantes restrições técnicas no sistema de plantio adotado, principalmente no que se refere ao tamanho e formato dos talhões, ao comprimento das fileiras, ao espaçamento entre fileiras e variedades inadequadas. Para utilização eficiente da colheita mecanizada será necessário planejamento técnico com mudanças no sistema de plantio, adotando talhões maiores e mais uniformes com relação ao formato, com fileiras acima de 500 m de comprimento, e espaçamento entre fileiras de 1,50 m, adoção de variedades eretas, produtivas e de raízes profundas.Palavras-chave: gerenciamento de operações mecanizadas; aspectos técnicos e de campo. 41Factors limiting the implementation of mechanical harvesting of sugarcane...Rev.

RESUMO -O sorgo sacarino tem potencial de uso como fonte de matéria-prima para a produção de bioetanol.Objetivou-se, com este estudo, analisar o efeito da adubação nitrogenada de cobertura na qualidade do caldo para QUALITY OF BROTH FOR ETHANOL PRODUCTION IN CULTIVARS OF SACARINE SORGHUM UNDER NITROGEN FERTILIZATIONABSTRACT -Sweet sorghum has potential as a source of raw material for the production of bioethanol. The objectiveof this study was to analyze the effect of nitrogen topdressing on the quality of the juice for ethanol production from four cultivars of sorghum. The experiment was conducted in Campos, State of Rio de Janeiro, Brazil, from January to May 2014. Four cultivars of sorghum: BRS 506, BRS 508, BRS 509 and BRS 511 were studied, and five nitrogen rates

Sugarcane is a major Brazilian agricultural product. The area cultivated in the state of Rio de Janeiro for the 2011-12 crop was of 41.31 thousand hectares. The process of mechanized harvesting of the crop still has many visible losses of raw materials caused by several factors. This study aimed at evaluating the visible losses of sugarcane and ratoon damage using the Case A4000 harvester and was conducted in the municipality of Campos dos Goytacazes, in the state of Rio de Janeiro, Brazil. The materials left on the field by the harvester were collected in six ratoon cane rows, with a length of 350 m, setting the frame sampling to every 50 m. The sampling area consisted of 20 m 2 , with eight repetitions. The losses were calculated in t•ha −1 and in %. The comparison of averages was performed by using the confidence interval, constructed by statistical "t" at 5% probability to compare the types of losses. The estimated productivity of the area was of 54 t•ha −1. The differences between the types of losses were significant. The billets and splinters were found in greater quantity.

Studies have shown that using higher operational capacity harvesters render less fuel consumption per harvested area and, as a result, less operating expenses. This paper aims to obtain the effective fuel consumption per hour of the CASE IH A4000 harvester during the mechanical harvest of raw sugar cane. The study took place in a sugar cane plantation with mechanical harvest in an area belonging to a producer for Coagro (Cooperativa Agroindustrial do Estado do Rio de Janeiro Ltda.) (Agroindustrial Cooperative of the State of Rio de Janeiro), in the municipality of Campos dos Goytacazes, Rio de Janeiro/Brazil. The variety of sugar cane was evaluated at RB867515 in its third cut. The system of automatic data acquisition was built from a volumetric flow sensor to determine the fuel flow, in addition to a data collector (Datalogger) and a global positioning system (GPS) device. To determine the fuel consumption per hour, data from the fuel flow sensor were used. The consumption per hour of fuel was 33.9 L.h-1. The effective consumption was estimated in 1.84 L. ton-1. The consumption per hour and the effective consumption of the CASE IH A4000 were more than double of what the manufacturers stipulated, which means, the consumption is much higher than desirable.