Certainly people who are working in various agricultural affairs exposed to a lot of noise sources and it has not fully specified all the risks for people who have long been exposed to the noise, yet. In this study, some factors affecting the noise generated by a model PO15538LT Poulan lawn tractor were evaluated. Research factors were including operation type and gear ratio for lawn tractor. Accordingly, factorial experiments in completely randomized design with three replicates were performed. The results of this study indicate that psychoacoustic annoyance correlated strongly with A-weighted sound pressure level analysis (R2 ¼ 0.957). The results also show that lawn route caused the lowest mean of A-weighted sound pressure level (80.3 dBA) and mowing operation caused the highest mean of A-weighted sound pressure level (87.9 dBA) for right ear. Also, results indicated that the lowest mean of psychoacoustic annoyance occurred in the case of lawn route (13.1). The highest mean of psychoacoustic annoyance occurred in the case of mowing operation (20.1).
