抄録
The shadows of a representative waterfield rice plant falling on the surface of the paddy field caused by the direct solar radiation were photographed, and on the basis of these data, it was maked an attempt to receive the relative values of the areas where exposed to the direct solar radiation at the surfaces of the paddy fields planted by the different methods.
In company this work, the daily extreme temperature of soil (5cm below the soil surface), soil surface, water (midst of the water layer, i.e. 1.5cm for field 1-4 or 4.5cm for field 5, 6 below the water surface), air (10cm above the water or soil surface) and also the diurnal course of the water temperature in the each fields were occationally observed over the growing period of the waterfield rice plant (but the extreme temperature of soil, soil surface and air in the field 5, 6 were determined in regard to the furrows).
From Figure 2-5 and Table 3-5 which were shown a part of those result, the relation between the each fields and the characteristics at the each fields are recognized.
