Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Changes in root and shoot ratios at different sampling dates for E. oxyrrhynchum (A), H. pulchella (B) and C. arenarius (C). * indicates a significant difference at α = 0·05 and ** indicates significant differences at the α = 0·01 level (n = 10).
