Figure 1.
Annual precipitation and precipitation during maize growing season during 2006–2009 in Fuxin County.
Table 1.
Experimental treatments of maize using a 311-A optimized saturation design during 2006–2009 in Fuxin County.
Figure 2.
The individual effect of I, N and P on maize grain yield by fixing two factors at 0 level.
I, N and P represent irrigation, nitrogen application and phosphorus application, respectively.
Figure 3.
Marginal grain yield with respect to I, N and P through the first-order differential analysis of equations (2)∼(4).
I, N and P represent irrigation, nitrogen application and phosphorus application, respectively.
Figure 4.
Interaction effects of I and N on maize grain yield by fixing P at 0 level.
I and N represent irrigation and nitrogen application, respectively.
Figure 5.
Interaction effects of I and P on maize grain yield by fixing N at 0 level.
I and P represent irrigation and phosphorus application, respectively.