Total dry matter accumulation was 14.7 and 22.3 Mg ha-1 for the 1960’s era
hybrids and the 2000’s era hybrids, respectively. At R6, nitrogen, phosphorus and
potassium uptake was 214, 40 and 122 kg ha-1 for the 2000’s era hybrids and 177, 28 and
92 kg ha-1 in the 1960’s era hybrids. Grain yield was also greater with the 2000’s era
hybrids than in hybrids from the 1960’s. The results show increased dry matter and
nutrient accumulation in new hybrids relative to the older hybrids, despite similar
accumulation patterns