Irrigated Soybean Leaf Photosynthesis in the Humid Subtropical Midsouth

Table 1

Sampling dates, days after planting (DAP), growing degree units 10°C base (GDU 10’s), of leaf photosynthesis measurements of three soybean cultivars (94B73, AG4303, and AG5503) grown using the early soybean production system on a Bosket sandy loam and Dundee silty clay at Stoneville, MS, in 2011 and 2012†.

Growth stage	Sampling date	DAP	GDU 10
Bosket
R3	6/20/2011	68	955.3
R4	7/7/2011	83	1233.1
R5	7/19/2011	97	1381.6
R3	7/5/2012	73	1055.5
R4	7/20/2012	88	1299.7
R5	7/27/2012	95	1420.6
Dundee
R3	6/17/2011	74	849.7
R4	7/6/2011	84	1161.1
R5	7/20/2011	98	1398.3
R3	7/6/2012	74	1072.8
R4	7/19/2012	87	1283.3
R5	7/30/2012	98	1468.1

†Official weather observations acquired from the Mississippi State University’s Delta Research and Extension Center, Stoneville, MS.