Fig. 3.
EF ratios (EFPHE/EFRET (blue cycles) and EFPM/EFRET (red cycles)) in this study for crop residue, hardwood, softwood and coal. The results are presented as arithmetic means and standard deviations.
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.