Abstract: The purposes of this study were to confirm yield formation characteristics of the integrated mode of micro-irrigation under limited water condition. A field experiment was carried out with split plot design (main plot of irrigation mode and subplot of sowing date) in Gaocheng of Hebei Province from 2015 to 2017 year to research the effects of two types of integrated irrigation modes on the growth,yield formation and water consumption characteristics of winter wheat under two sowing date conditions. The two irrigation methods were micro sprinkler irrigation(Micro-irrigation) and border irrigation,with two sowing date of Oct.10 and Oct.15. The results showed that wheat yield formation characteristics of micro-irrigation were difference in two conditions,one was normal precipitation of adequate soil water storage before sowing (2015-2016),and the other was dry precipitation of insufficient soil water storage before sowing (2016-2017). The year of adequate soil water storage before sowing and normal precipitation,growth index and yield traits of micro-irrigation mode were similar or slightly below than the border irrigation under suitable sowing date (Oct. 10),while it had more obvious advantage for micro-irrigation mode under delayed sowing (Oct. 15). Compared with border irrigation,when sowing date was postponed wheat grow faster,and LAI,leaf SPAD value of later stage and grain filling rate were significantly higher for micro-irrigation mode,so its grain weight was increased by 5.2%-8.8%,and grain yield was increased by 3.4%-3.5%. Compared with border irrigation,soil water consumption was higher,total water consumption was decreased significantly by 3.8%-4.5%,and WUE was increased significantly by 7.3%-8.5% for micro-irrigation. The water consumption of late sowing wheat was lower than that of suitable sowing wheat,decreased by 3.8%-4.5%,but the yield and WUE were obviously higher than that of suitable sowing wheat. The year of insufficient soil storage before sowing and dry precipitation,the total irrigation amount was low for micro-irrigation,so its advantages of water and fertilizer integration could not be played,so for micro-irrigation,its LAI,leaf SPAD value and grain filling rate in the late growth stage was lower than that of border irrigation under two sowing date condition,and finally resulting in lower yield,and grain yield was decreased by 6.6%-13.0%. So the year of adequate soil water storage before sowing and normal precipitation year,the wheat was recommended micro-irrigation under late sowing condition. When this technical measure was adopted,irrigation amount of 57.7 mm was saved,and grain yield and WUE were increased by 4.1% and 16.7% respectively,and the contribution to yield was similar for two technical of irrigation methods and postponed sowing date.

Key words: Winter wheat, Micro irrigation, Border irrigation, Sowing date

CLC Number: 

• S152.7

• S512.01