Table 2: Predictive regression equations of mean photosynthesis rates (CER ( mol CO2 m−2 s−1)) versus PPFD of recently matured leaflets for three irrigated soybean cultivars (94B73, AG4303, and AG5503) at growth stages R3, R4, and R5 grown using the early soybean production system on a Bosket sandy loam and Dundee silty clay at Stoneville, MS, in 2011 and 2012 .

YearGrowth stageBosket Dundee

2011R3, R4, and R5 0.9717 0.9732
2012R3 and R4 0.9818 0.9905
R5 0.9879 0.9905

Calculated from the means of 3 plants, 3 cultivars, and 3 replications at each growth stage.