As we discussed last time, at the R5 growth stage, corn is dying to fill the developed kernels with photosynthate by remobilizing nutrients from leaves and stalk into the ear. If the plant already has reduced levels of nitrogen due to stress or poor management, excessive cannibalization as senescence will occur. But what happens if there's plenty of nitrogen during the R5 growth stage? Will that make more grain yield, higher protein, both, or neither? Under High N Managemen

As corn marches towards maturity, an inevitable situation occurs: the plant essentially pulls nutrients from its reserves in leaves and stalk to remobilize into its grain, causing its own demise so that its offspring can live on. This may sound a little morbid, but this is part of the cycle of life. Annuals like corn only get one year to exist and develop seed that will grow in future seasons. Let’s examine further what goes on with corn at the last stage of its developmen

Maximizing corn yield depends on a strong “solar collection system” of healthy upper canopy leaves and sufficient nitrogen during reproduction. Research shows upper leaves drive 80–90% of photosynthesis, while lower leaves serve as nutrient reserves. Effective nitrogen management—especially during grain fill—helps prevent stress, maintain kernel weight, and protect yield potential.