Research Article

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

Table 7

Grain yield means and selected contrasts for the significant main effects of fertilizer treatment and N application timing for 2004 growing season.
(a)

Fertilizer
treatment
Grain yield
(kg ha−1)
N application
time
Grain yield
(kg ha−1)

11569Preplant2676
22688Topdress2537
32852 61
42607
52921
62725
72883
151

(b)

ContrastsSigDif

P fertilizer added versus No P fertilizer addedns−6
K fertilizer added versus No K fertilizer addedns40
45 kg N ha−1 versus 90 kg N ha−1*−212

SED: standard error of the difference between the main effects of fertilizer treatment and N application timing.
* is significant at the 0.1 level.
ns: not significant at the 0.1 level.