Fig. 1.

Seasonal biomass and P accumulation among yield responsive hybrid pairs at Champaign during 2010. Yield responsive hybrids include the non-Bt and Bt comparison of hybrid pairs 1, 2, and 4 (Table 6). All values are presented on a dry matter basis (0 g kg–1 moisture concentration). Heat units are quantified with Modified Growing Degree Days (GDDc; minimum and maximum temperature limits of 10 and 30°C, respectively) (Cross and Zuber, 1972).