我省是我国南方冬麦区的重要产麦地区。当前正是加强春季麦田管理的时期。开春后,我省小麦陆续开始拔节。拔节是生长发育上的一个重要转折时期,小麦从拔节前的一段时间起幼穗开始分化,直到孕穗期间,穗子就全部发育完成。与此同时,茎秆和叶片也相应地加速生长。在一般情况下,冬前和早春的分蘖其成穗率较高,后期分蘖往往成穗率很低或者逐渐死亡而成无效分蘖。所以,加强春季田间管理,特别是早春拔节前后的麦田管理,是确定有 My province is an important winter wheat region in China’s southern region. It is time to step up the spring wheat field management. After the spring, the province began to join the wheat one after another. Jointing is an important turning point in growth and development. Young spikelets began to differentiate in wheat from a period of time before jointing until the booting stage was completed. In the meantime, the stalks and leaves are correspondingly accelerated as well. Under normal circumstances, the tillering rate of winter and early spring is higher, and the late tillering rate is often low or gradually dead, resulting in ineffective tillering. Therefore, to strengthen field management in spring, especially before and after spring wheat jointing management, is to determine the