[Influence of water deficit and supplemental irrigation on nitrogen uptake by winter wheat and nitrogen residual in soil].
Pot experiment in greenhouse showed that water deficit at all growth stages and supplemental irrigation at tillering stage significantly decreased the nitrogen uptake by winter wheat and increased the mineral N residual (79.8-113.7 mg x kg(-1)) in soil. Supplemental irrigation at over-wintering, jointing or filling stage significantly increased the nitrogen uptake by plant and decreased the nitrogen residual (47.2-60.3 mg x kg(-1)) in soil. But, the increase of nitrogen uptake caused by supplemental irrigation did not always mean a high magnitude of efficient use of nitrogen by plants. Supplemental irrigation at over-wintering stage didn't induce any significant change in nitrogen content of grain, irrigation at filling stage increased the nitrogen content by 20.9%, and doing this at jointing stage decreased the nitrogen content by 19.6%, as compared to the control.
Wang
Zhaohui
Z
Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Area, Northwestern Science and Technology University of Agriculture and Forestry, Yangling, China. w-zhaohui@263.net
Wang
Bing
B
Li
Shengxiu
S
D000042:Absorption; D005308:Fertilizers; D009584:Nitrogen / Q000032:analysis / Q000378:metabolism*; D012621:Seasons; D012987:Soil / Q000032:analysis*; D014908:Triticum / Q000378:metabolism*; D014867:Water / Q000378:metabolism*
D005308:Fertilizers; D012987:Soil; D014867:Water; D009584:Nitrogen