摘要
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。
Field and pot trials with winter wheat varieties Shannong Fu 63 and Lumai 8 revealed that sowing dates influenced mainly the root growth before winter. The accumulated values of air temp.(>℃) and soil temp. at 5-cm depth before winter related closely to the secondary root number per plant, root dry weight and root vigor. The correlation coefficient of roots and tillers was r=0.9992 and that of the aerial part DW and root DW r=0.9986 at overwinter stage. The growth rate of root systems was much greater than that of shoots, especially in the later sowing treatment. The root growth during spring related to the seedling growth before winter. The root expanded from green-turning to jointing stages, and root filling occurred in the jointing-flowering phase. The root dry weight was closely correlated with the dry weight of above ground parts from flowering to milky-ripe stages and with the grain weight at harvesting stage
出处
《山东农业大学学报（自然科学版）》
CSCD
1992年第4期358-362,共5页
Journal of Shandong Agricultural University：Natural Science Edition
关键词
小麦
根系
播种期
wheat
root system
sowing date
