Abstract
This experiment started from the observation that a rice hill planted alone or sparsely has an ellipse-shaped cross-section. The rice plant cv. Koshihikari was planted in 1/2000 are pot and was dressed at three levels. Bending angles of culms at the different positions in a hill were measured in both cases of wind direction parallel to the major axis of a hill (PL) and at right angles to that axis (TR). Wind speed ranged from 3 to 13m/s. The results are summarized as follows: 1. In PL, the bending angles of each culm at different positions in a hill were different even at the same wind speed. The angle of the most windward culm was larger than that of the most leeward one. It was shown that the bending angles of culms tended to be larger with increasing nitrogen doses. 2. In TR, the bending angle of the main culm was larger than that of the main culm when wind was in the parallel direction. The main culms with different nitrogen doses showed not always typical tendency.
