This paper was dealt with an investigation in design and operation of the plants for drying and storage of paddy, in the case of IZUMO Agriculture Cooperative Association. This study was made investigations on yearly the number of combines and the using conditions of these plants. The items of investigations were hourly and dayly fluctuations of the amount of paddy, physical properties of paddy received, design of plants and accumulated stock. The main results were as follows :
1. It is tendency that the number of plant is increased with the increase The number of combines.
2. The pattern of the quantity received by the hour may be classified Type I and II. In the case of type II, the condition of the stock is frequently in the over recipt. In these case, it is a problem that the waiting time for the receipt of paddy needs about 1 to 2 hour at the longest. The problelm is how to reduce the increase of waiting time, resulting the use of combines.
3. From the results of calculation with the processing speed, it is presumed that the condition of stock accumulated may be occurred frequently.
4. In order to take measures of reducing waiting times for the receipt of paddy, it may be necessary that the change from simple receipt window to multiple receipt windows or the increase of capacity of a auto-scale is planned.