Fig 4.
Changes in the concentrations of ammonium and nitrite plus nitrate in incubations for nitrification activity. Means and standard deviations from two representative experiments (with four replications each) are shown.
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.