The farm tractor fleet in the Brazilian market has increased. They are machines known to emit much noise. Noise can cause severe damage and disturbance in people who work directly with and around these machines. Therefore, the work aimed to evaluate the noise levels emitted by two cab farm tractors of different engine power, analyzing the effect of engine speed and distance radius from the noise source on occupational health. The noise level outside and inside of the tractor cab, the attenuation index, and the noise level reduction provided by the cab sound insulation were determined. Attenuation indexes and noise reduction ratings were satisfactory in studying the noise levels inside and outside the tractor cab. The tractor with the most power in the engine has better sound insulation compared to those lowest power. The noise levels that operators are exposed to in the cab were lower than the limits established by Brazilian government laws. On the other hand, outside the cab, the noise levels emitted by the tractor of greater power are not safe for the workers' health if they are at a distance radius from the noise source of less than 7 m, requiring the use of an ear protector.
Glycine max L. sowing progression in regions of Mato Grosso: a contribution to the study of mechanized systems planning Soybean sowing has been occurring early in the state of Mato Grosso, aiming to increase the second crop area. Sowing planning is important for soybean yield and losses may occur due to the anticipation of sowing under conditions not favorable for crop growth. In planning, the operational rhythm is estimated, using methodologies based on the estimation of the available time in which administrative issues such as working hours, working on Sundays and holidays and edaphoclimatic constraints that affect the number of working days are considered. Monitoring the evolution of soybean implementation and providing information on the start and end dates and the values of the sown area on a regional scale has contributed to decision making and has been officially carried out for years. Given the challenge for the planning of mechanized systems and the availability of historical series on the performance of the sowing operation in Mato Grosso, the objective of this work was to ascertain through the among of work required, the relationship between the sowing rate actually performed, with the planned intensity, ie the operational rhythm (RO). The methodology for estimating the intensity of sowing performed, called the sowing rate used data from historical series of the follow-up of the operation, and linear regressions were performed in 6 harvests in the middle north and southeast macroregions of Mato Grosso. To calculate the time available to perform the operation were collected climate data and characteristics of soil types. The calculation of the number of improper days (NDimp), those restrictive due to climate issues, met the criteria with the maximum rainfall on the previous day and on the day of sowing less than 10 mm and presence of soil moisture between 40 to 90% of the capacity water available (CAD). Sensitivity analysis of the effects of rainfall and soil water strip on NDimp was performed in both macroregions. The results indicated a sowing rate and RO values of 3.02 and 9.14% per day in the macroregions, that is, there was a discrepancy between the planning values with the RO estimation and those observed in both macroregions. Moreover, in the scenario with maximum allowable rainfall of 10 mm on the day and the previous day and soil water range of 20 to 70% of CAD, the lowest RO occurred in both macroregions. It was concluded that the sowing progression presents distinct intensities during the cultivation period, with high intensity in the central period of the crop and most of the area sowed in a short period. The seeding operation is carried out under inadequate soil moisture conditions.
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