我国北部地区小麦的种植方式,一般来說均为条播种植。在耕作、施肥、田間管理等农业技术措施完全相同的情况下,仅由于种植行向的不同,植株本身所接受的光照将有着巨大的差异。这是与太阳运行的方向和小麦生长期間的羣体結构密切相关的。因为在小麦的主要生长季节(例如从拔节到黄熟),太阳漸向北回归线方向移动,日出逐漸提早,日落也漸推迟,中午的太阳高度角逐漸增大,从早到晚走完了大半个弧圈。早晚太阳的高度角小,光线近水平方向上射来,容易在东西行向小麦的行間穿过;但是对南北行向的小麦来 The cultivation methods of wheat in the northern part of our country are generally planted and planted. In farming, fertilization, field management and other agricultural techniques exactly the same circumstances, only because of the different planting lines, plants themselves will receive a huge difference in light. This is closely related to the direction of the sun and the group structure during wheat growth. Because in the main growing season of wheat (for example, from jointing to ripening), the sun gradually moves toward the Tropic of Cancer, the sunrise is gradually earlier, the sunset is gradually delayed, and the midday sunward angle gradually increases. Arc circle. Sooner or later the sun’s angle is small, the light shot in the horizontal direction, easy to pass between east and west lines to the wheat; but to the north-south direction of wheat