Table 3 Mean squares from the three-way analysis of variance for the competitive ratio of winter wheat (W) and herbicide-resistant or herbicide-susceptible blackgrass (B) calculated for the relative grain number (WBCRgn) and plant biomass (WBCRb).

From: Intra- and interspecies competition of blackgrass and wheat in the context of herbicidal resistance and environmental conditions in Poland

Source of variation

df

WBCRgn

WBCRb

Year

1

2.87

0.67

Site

6

10.9***

11.7***

Blackgrass biotype

1

1.20

0.22

Year × site

6

2.62**

1.54**

Year × biotype

1

0.02

2.94**

Site × biotype

6

2.45***

0.27

Year × biotype × site

6

1.18

3.19***

Residual

140

0.81

0.36

  1. df degrees of freedom.
  2. *P < 0.05; **P < 0.01; ***P < 0.001.
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