Control ± S.E.

Low ± S.E.

Intermediate ± S.E.

High ± S.E.

Ditch number

2, 5, 8

1, 4, 7

3, 6, 9

Daily (˚C)

11.968 ± 0.254

13.425 ± 0.140

15.448 ± 0.140

16.422 ± 0.150

Monthly (˚C)

12.113 ± 1.038

13.480 ± 0.599

15.506 ± 0.599

16.513 ± 0.599