Table 4 The means of winter wheat characteristics and environmental parameters in the two groups of experimental sites according to the k-means analysis.

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

xi

Characteristic

Year

Group 1

Group 2

P

Lp S; Lp R; Mo S Mo R

Sw S; Sw R; WG S; WG R

Cz S; Cz R; Wr S;

Wr R; Md S; Md R

1

Sand (× 1)

 

76.63

36.93

***

2

Silt (× 2)

 

20.15

49.20

**

3

Clay (× 3)

 

3.28

13.87

***

4

Coefficient K (× 4)

2019

1.10

1.97

*

2020

2.23

2.53

ns

5

Length (× 5)

2019

59.55

73.95

ns

2020

68.28

79.72

ns

6

Yield (× 6)

2019

5.06

10.19

**

2020

6.62

11.68

**

7

TGW (× 7)

2019

42.24

41.16

ns

2020

43.43

42.87

ns

8

Biomass (× 8)

2019

16.22

23.64

ns

2020

27.87

28.81

ns

9

Seeds number (× 9)

2019

111.4

245.1

***

2020

162.1

278.4

**

  1. Sites of experiments: Lp Lipnik, Mo Mochełek, Md Mydlniki, Cz Czesławice, Sw Swojczyce, WG Winna Góra, Wr Wrocław. Mixture with (R) resistant, (S) susceptible biotype of blackgrass; TGW thousand-grain weight, K hydrothermal coefficient, P probability, *0.05, **0.01, ***0.001, ns not significant.
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