本试验证明,播种期对冬小麦根系的影响关键在冬前生长期、冬前气温(>0℃)积温和5cm处地温(>0℃)积温与单株次生根数、根十重、根系活力密切相关,越冬期根蘖关系为r=0.9992,地上干重与根干重r=0.9986。越冬过程“上闲下忙”,根系增长较快。春季根系生长与基础苗情有关,返青—拔节期为“根系膨大期”,拔节—开花期为“根系充实期”,根重与开花灌浆期地上干重、收获期千粒重显著相关。 The results showed that the key to the effect of sowing date on the winter wheat root system was the winter pre-winter growth period, the temperature before winter (> 0 ℃) and the ground temperature (> 0 ℃) at 5cm and the secondary root number per plant, Closely related, overwintering root tiller relationship was r = 0.9992, dry weight on the ground and root dry weight r = 0.9986. Overwintering process “idle busy”, root growth faster. The root growth in spring was related to the basic seedling condition. The rejuvenation-jointing stage was “root swollen period”, and the jointing-flowering stage was the “root extender period”. The root weight was significantly related to the dry weight at flowering stage and the 1000-grain weight at harvest.