Abstract: This research showes that the development of spring wheat roots depends on rhizospere, the roots at shallow layer are strong which suits the condition of water lack and the roots at deep layer are stronger as the material foundation of high yield.After irrigation the N and P contents in plant are higher,however the K content in stems is higher without irrigation with the rhizospere becoming deepei,the nutrition assimilation increased.N and K was high and P was low.At early growth stage,N and P content in stems and leaves were higher,but at lategrowth stage,N and P contents in seed were higher and K content in stems and leaves was higher.The yield increases with the rhizospere becoming deeper.When fertilizing shallow layer,yield increased 13.9%,after irrigation yield increased 16%,fertilizing deeplayer,yield increased 57.8%,and after irrigating the yield increased 29.5%.Spray-irrigating at shallow layer or deepening plough laye.and fertilizing are important methods for high yield in dry land.

Key words: Spring wheat, Rhizospere, Nutrition supply, Growing period

CLC Number: 

• S512.101