Abstract: Through tube and pot cultivation experiment,the effect of root pruning in regreening stage on growth development,water use efficiency and yield formation of winter wheat were researched.Three root pruning in regreening stage were set in 2013-2014 and 2014-2015,included small root pruning,large root pruning and no root pruning (CK).The result showed that leaf SPAD values was reduced after root pruning,for large root pruning treatment,its leaf SPAD value decreased rapidly at late growth stage.Tiller per plant was restrained when the root was pruned,but the growth of effective tiller was promoted when the root was pruned mild,thus the tiller per plant was increased significantly,while tillering ability and effective tiller of mature period was low when the root was pruned severe.Root weight of 0-140 cm was reduced when the root was pruned mild,and root and shoot ratio decreased,the main reason for the decrease of root weight was that the deep root weight was reduced.The leaf area and dry matter weight of shoot was increased when the root was pruned mild,thus the grain weight per plant was also increased corresponding.Due to excessive root pruning for large root pruning treatment,its root and shoot dry weight were decreased,and the grain weight per plant was significantly reduced.Water consumption,grain yield and water use efficiency were increased obviously when the root was pruned mild,especially the trend was more obvious under limiting water condition,and for large root pruning treatment,although the water consumption was reduced,but grain weight was decreased also,so water use efficiency was significantly reduced.

Key words: Wheat, Root pruning, Grain yield, Water use efficiency

CLC Number: 

• S512.01