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 stageSampling dateDAPGDU 10

Bosket
R36/20/201168955.3
R47/7/2011831233.1
R57/19/2011971381.6
R37/5/2012731055.5
R47/20/2012881299.7
R57/27/2012951420.6

Dundee
R36/17/201174849.7
R47/6/2011841161.1
R57/20/2011981398.3
R37/6/2012741072.8
R47/19/2012871283.3
R57/30/2012981468.1

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