Fig 7. Nitrogen concentration in different N fractions in soils receiving vegetal (VO) or animal-based (AO) organic fertilizer and their respective mineral controls (VMC and AMC, vegetal and animal mineral controls, respectively)*. *, †, ‡See Fig 1.
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.