Effects of Fertilization Depth on Biological Character and Yield of Winter Wheat in Semi-arid Region

In order to study the effects of fertilization depth on the growth and yield of winter wheat under two different water stress conditions,a two-layer root pot(20 cm height of the drier,upper layer,and 40 cm height of the wetter,lower layer) was established and a dry-land wheat variety was chosen in the study.The results showed that fertilization depth had significant effects on the biological characters and yield of winter wheat under two water stress conditions.Under any water stress condition,the plant height,leaf area,shoot biomass and yield in the fertilization treatments were higer than those in the no fertilization treatment but the plant height and leaf area in the upper-soil fertilization treatments were higher and lower than in the lower-soil fertilization treatments,respectively.The differences of shoot biomass and yield were not significant among the fertilization treatments.The positive effect of fertilization on yield was mainly due to spike increase.The upper and lower fertilization increased and reduced root / shoot ratio,respectively but fertilization did not influence harvest index.It was suggested that fertilization could prompt wheat growth and increase yield in drought condition but the effects of fertilization depth treatments on different characters were different.