Abstract
This research was mainly conducted to obtain basic ergonomic data about tractor operator performance and to analyze the mastering process of tractor operation, especially reversible moldboard-plowing using a ride-on tractor. This paper mainly deals with the analysis of learning curve patterns of beginners to assess the necessary expertise level through a comparison with skillful operators. Comparative analyses between beginners who do and do not have automobile-driving experience are also discussed. Suggestions for the minimum account of practice and instructional attentions are also given.
It was proven that the automobile-driving capability of beginners was cognitively advantageous for the learning tractor operation. Compared to the skillful operators, almost, no significant difference in physiological burden was recognized in the beginners, except at the beginning of practical experience of the non-driverslicensed beginners. The tillage straightness was clearly the most difficult task to be mastered. In this regard, a minimum working (learning) time of about 64 and 67 hours is recommended for DL and NDL beginners, respectively, to reach the necessary level of performance. From the various results, the mastering process of reversible plow tillage may be divided into the first and second steps. Depending on the situation, the practice of second step (DL-beginners : after 3 hours, NDL-beginners : after 43 hours) is considered that it may be made to be the self-training.
