-------------------- ˚C --------------------

Landscape fabric

22.6

b^z

22.8

b

17.6

a

10.1

a

7.3

a

Herbicide

25.5

a

25.0

a

16.6

ab

8.9

b

5.6

b

Straw mulch

19.9

c

20.4

c

16.1

b

9.5

ab

6.6

ab

Woodchip mulch

21.7

b

22.2

b

17.5

a

10.5

a

7.0

a

p > f^y

<0.0001^*

<0.0001^*

0.0302^*

0.0469^*

0.0229^*

Weed control method

2009 soil temperature

July

August

September

October

November

-------------------- ˚C --------------------

Landscape fabric

19.7

ab

19.8

16.1

8.8

a

7.0

a

Herbicide

22.0

a

19.8

17.4

6.1

b

4.5

b

Straw mulch

18.5

b

18.6

17.0

7.0

ab

4.7

b

Woodchip mulch

20.2

ab

20.4

18.0

8.9

a

6.4

ab

p > f

0.0116^*

ns

ns

0.0186^*

0.0337^*