Table 3 Results of three-way ANOVA (F-ratios) showing the effects of different materials (unburnt and burnt) (M) with different concentrations (C) of Phragmites australis litter extract on growth of Lactuca sativa seedling densities (D)

1

64.76***

1.92^ns

25.55***

64.27***

246.88***

2

10.54***

50.81***

9.71***

93.17***

180.34***

3

37.02***

23.85***

40.55***

5.20**

154.91***

2

11.03***

4.44*

4.55*

27.20***

19.55***

3

7.41***

1.57^ns

3.41*

11.98***

16.25***

6

6.91***

3.78**

6.10***

2.06^ns

6.19***

6

1.00^ns

1.34^ns

1.01^ns

2.96*

2.29*

48

72