Effect of Preplant Irrigation, Nitrogen Fertilizer Application Timing, and Phosphorus and Potassium Fertilization on Winter Wheat Grain Yield and Water Use Efficiency

Table 2

Dates of agronomic activities for growing seasons utilized in this study.

Year	Irrigation^a	Preplant application	Planting	Topdress application	Harvest
2003	Aug. 10, 2002	Sept. 10, 2002	Oct. 1, 2002	Mar. 7, 2003	May 30, 2003
2004	Aug. 5, 2003	Sept. 17, 2003	Oct. 1, 2003	Mar. 11, 2004	May 28, 2004
2008	Aug. 8, 2007	Aug. 29, 2007	Oct. 2, 2007	Feb. 28, 2008	Jun. 3, 2008
2011	Jul. 27, 2010	Sept. 13, 2010	Oct. 1, 2010	Mar. 15, 2011	Jun. 1, 2011

aIrrigation applied by flood at a rate of 100 mm.