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R3 Corn Growth Stage Explained: Why Late-Season Tissue Sampling Matters

Aug 27, 2026

Video: R3 Corn Growth Stage Explained: Why Late-Season Tissue Sampling Matters

Corn pollination may be behind us, but the work isn't over.

In this field update from the Nutrien Innovation Farm in Champaign, Illinois, agronomist Tim Sickman discusses why growers should stay engaged with field scouting during the R3 (milk) stage of corn development. While favorable weather, strong pollination, and early grain fill are encouraging signs, important questions about crop nutrition and yield potential still remain.

Tim explains: What the R3 corn growth stage looks like

Why successful pollination isn't the finish line

The importance of late-season field scouting

How tissue sampling can identify nutrient deficiencies

The role of sulfur, zinc, potassium, and other nutrients during grain fill

Using tissue analysis to improve future fertility management plans

As corn moves through grain fill, understanding nutrient availability and plant health can provide valuable insights for maximizing yield potential and planning for next season.