Harvest · September 2025 · 4 min read
Stalk quality declines rapidly after corn reaches physiological maturity, and weak stalks lead to harvest losses from lodging. Assessing stalk integrity before harvest helps you prioritize fields and minimize downed corn. Two simple field tests give you reliable information in minutes.
Walk through the field and push each plant approximately 30 degrees from vertical at ear height. If the stalk breaks below the ear or does not spring back, it is compromised. Test at least 100 plants across multiple areas of the field. If more than 10–15% of stalks fail the push test, that field should move to the front of your harvest schedule.
Pinch or squeeze the internode just above the lowest node that is above the soil line. A healthy stalk feels firm and resists compression. A stalk that crushes easily has been cannibalized—the plant moved sugars and nutrients from the stalk to fill the ear, leaving weakened pith tissue. This is especially common in high-population, high-yield fields.
Stalk cannibalization is driven by stress during grain fill, including drought, leaf disease, and cloudy weather. Fields with extensive cannibalization are at greatest risk of lodging in wind and rain events. Prioritize these fields for early harvest.
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