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.
The contents of nitrate of lettuce plants grown under different light treatments (at harvest). Different letters for the same parameter indicate significant differences at the 5% level, according to the Tukey’s test (n = 3). The bars represent the standard errors.
