We developed a scenario for experimental farm work safety instruction computer software based on statistical analyses, such as agricultural machinery work accident analysis, and a sophisticated 3D model of a tractor and a rotary tiller for 3DCG to allow virtual experience of accidents.
Farm work accidents with a tractor are occurred at high frequency. The scenario was composed of a day of work of rotary cultivation using a tractor with a retractable ROPS (Roll Over Protective Structure) and engine power of approximately 15 to 22kW, which is a common task with a tractor. The settings included diverse situations, such as falling from the tractor, collision with cars on the road, or the operator being pushed into an obstacle, such as a wall or tree, by the tractor, as types of accidents, and unpaved and paved farming routes, highways, and tunnels as types of road.
Each item in the scenario was divided into evaluation and non-evaluation criteria; in the former, items related to farm work safety awareness were weighted in 4 levels. In addition, each item was weighted in 3 levels on both excellence for correct answers and on warning or attention for wrong answers from the viewpoints of accident prevention and health maintenance.
A 3D model of the tractor and rotary tiller was developed, referring to several machine models currently on the market. The marks specified by the JIS standard and Japanese characters were both indicated on measuring instruments and manually operated devices on the tractor.

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Two dairy farms in Fujinomiya City, feed factory and milk plant were investigated to examine the environmental load in life cycle of milk production. Supposing two dairy farms as organic production (type A) and ordinary production (type B), the following were compared; input work, energy consumption and CO₂ discharge, nitrogen and phosphoric balance in the step of dairy farm production. As the result, following fact became clear. In the organic production (type A), input work and environmental load associated with the feeding work are greater than that of the ordinary production (type B) since they feed the silage in the organic production. The environmental load related to the manure treatment in the organic production farm is bigger than that of the ordinary production because the solid-liquid separation, composting treatment and the aeration treatment of liquid manure are employed in order to reuse the manure on own pastureland. It is the almost equivalent environmental load of nitrogen and phosphorus if the difference of balance between input and output in the dairy farm is the environmental load. I worry about accumulation of nitrogen and phosphorus to the pastureland or runoff to the circumstance because the organic dairy farm has never brought out the manure. For developing the function of the organic production system on the circulation of organic resources, the regional trading and production system is necessary to balance nitrogen and phosphorus.

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