Growing season

Long

Short

Mean ± SE

Jointed goatgrass population

---------- g ----------

A-R

13.8 ± 0.3

7.3 ± 0.0

B-W

12.7 ± 0.7

2.6 ± *

C-S

11.8 ± 0.1

4.4 ± 0.4