Fig. 5. Residual stem N and soluble nonstructural carbohydrates (SNC) (mg kernel^-1) at physiological maturity (PM) of hybrids DK664 and DK752 in response to the post-flowering source-sink ratio. Model parameters ± standard errors are shown in the insert. The post-flowering source-sink ratio was calculated as plant biomass increase per kernel during the effective grain-filling period (mg kernel^-1).