Abstract: In order to determine suitable border wide for irrigation in well and canal combined irrigation area in Hebei Xinji,in the wheat growth seasons of 2015-2016 two border lengths of 45 and 60 m,three border width of 8.3,5.5 and 2.8 m were installed in field to study the effects of different border wide for irrigation on irrigation uniformity,spatial distribution of nitrate nitrogen in soil,the water consumption characteristics and grain yield of wheat.The results showed that the flag leaf SPAD and LAI at late growth stage of 8.3 m border width treatment kept a high level,and grain yield was significantly higher than that of other border width treatment. The irrigation water amount and the proportion of total water consumption,and the nitrate nitrogen content of deep soil of 8.3 m treatment were significantly higher than that of other border width treatments,but for border length 45 m+ border width 8.3 m treatment,its soil nitrate nitrogen content was only higher 5.8% than that of border length 60 m+ border width 2.8 m treatment. Water use efficiency (WUE) of 8.3 m border width treatment was high,but did not significantly different with other treatment under the condition of border length 45 m. Soil water utilization rate of 2.8 m border width was higher,and the nitrate nitrogen content of deep soil was significantly lower than that of other treatments. WUE of 2.8 m border width was respectively high 12.7% and 7.9% than that of 8.3,5.5 m width under the border length 60 m condition. LAI at late growth stage of 5.5 m border width treatment kept a high level,but the difference was not obvious for the flag SPAD and grain yield between 5.5 m and 2.8 m border width treatments,and they were lower than that of 8.3 m border width treatments. The nitrate nitrogen content of deep soil of 5.5 m border width treatments was in the middle level. Therefore,high yield and high WUE could be achieved when border length was 45 m and border width was 8.3 m,and high WUE could be achieved when border length was 60 m and border width was 2.8 m,and soil nitrate content was low under these of condition,so they could be recommended as the better border width of Hebei area.

Key words: Wheat, Field border wide, Yield, Water consumption characteristics

CLC Number: 

• S512.01