The Effect of Wind Directions and Speeds on Bending Angles of Culms at the Different Positions in a Rice Hill

Japanese Journal of Crop Science

Takeshi IKEDA¹ 

关键词: Bending angle;    稲株の長軸方向;    Breaking resistance;    稈;    Culm;    基肥窒素;    Lodging index;    傾斜角度;    Major axis of a hill;    挫折重;    Nitrogen dose of basal dressing;    倒伏指数;    Wind speed;    風速;    Wind tunnel;    風洞;   

DOI  :  10.1626/jcs.57.276

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

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.

【 授权许可】

Unknown