Irrigated Soybean Leaf Photosynthesis in the Humid Subtropical Midsouth

Table 2

Predictive regression equations of mean photosynthesis rates (CER (𝜇mol 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†.

Year	Growth stage	Bosket	𝑅^2	Dundee	𝑅^2
2011	R3, R4, and R5	𝑦=−0.000006𝑥^2+0.0235𝑥+2.611	0.9717	𝑦=−0.00006𝑥^2+0.0201𝑥+4.5398	0.9732
2012	R3 and R4	𝑦=−0.00006𝑥^2+0.0214𝑥+5.3225	0.9818	𝑦=−0.00006𝑥^2+0.0199𝑥+7.4126	0.9905
	R5	𝑦=−0.0006𝑥^2+0.0156𝑥+4.2831	0.9879	𝑦=−0.00006𝑥^2+0.0199𝑥+1.0303	0.9905

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