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.
Relationships between εc and individual independent variables in six major food crops. Independent variables included YOR, mean annual [CO2] during the measurement period, T, available St, and water available during the growing season as precipitation and irrigation (H2O). Lines represent least-squares regression, with corresponding significance levels and correlation coefficients in each graph. εc versus density in maize is not shown.
