Fig. 3. Leaf area index (LAI) as function of cumulative GDD for sunn hemp during 2001 (
) and 2002 (
), lupin during 2001–2002 (
), and vetch (
) during 2002–2003. Error bars reflect standard error values. Regression models shown are for both years of sunn hemp together (ySH) and lupin and vetch together (yL). Circled values were not included in regression model for sunn hemp as they represent sample dates at which leaf senescence occurred.