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