Influence of Controlled Drainage on the Groundwater Nitrogen and Phosphorus Concentration at Jointing-Booting Stage of Wheat

Table 2

Division of growth stages of winter wheat in 2007-2008.

Stages	Tillering stage	Jointing-booting stage	Panicle initiation stage	Milky stage
Starting date	February 11	March 26	April 17	May 1
End date	March 25	April 16	April 30	May 25