Response variable

Corn density

Corn height

Italian ryegrass biomass

Corn yield

Early season

Late season

Main/Interaction effect

P value^a

Year

0.4618

0.9791

<0.0001

0.0911

0.0344

Population (Pop)

<0.0001

<0.0001

<0.0001

0.3768

<0.0001

Italian ryegrass density (Den)

<0.0001

<0.0001

<0.0001

<0.0001

<0.0001

Year × Pop

0.0021

0.0274

0.1174

0.0298

0.0003

Year × Den

0.3229

0.0095

<0.0001

<0.0001

0.5607

Pop × Den

0.1802

0.0351

0.0833

0.5752

0.7781

Year × Pop × Den

0.1042

0.5557

0.3487

0.7113

0.9444