Corn Growth and Development

C.O.R.N. Newsletter Articles

  1. Corn Replant Decisions

    Author(s): Alexander Lindsey

    As the weather has turned warm this past week, many of our fields planted in April/early May should be emerged or be in the process of emerging. Cool temperatures paired with rain over the last few weeks may have resulted in seeds sitting in the ground longer than expected, or some fields experiencing imbibitional chilling or surface crusting as the soil dried. These conditions could result in stand reductions by preventing seeds from successfully germinating and emerging (Fig. 1).

    Issue: 2021-15

  2. Growing Degree Days vs. Calendar Days – How Long Will Emergence Take?

    Author(s): Alexander Lindsey , Author(s): Greg LaBarge, CPAg/CCA

    When we examine crop emergence post-planting, two factors can impact speed of emergence – soil moisture content and soil temperatures. If soil temperatures are lower, it can take more calendar days for emergence to occur meaning rowing corn may take a little more time. In the Ohio Agronomy Guide, emergence should begin to occur after approximately 100 air GDDs.

    Issue: 2021-13

  3. Extended Drydown in Corn

    Author(s): Alexander Lindsey

    As fall is progressing, crop harvest is also occurring throughout the state. However, many producers are seeing slower than usual drydown in their corn fields this October. This may be in part due to how the weather conditions impacted corn growth and development this year.

    Issue: 2020-36

  4. Corn Pollination

    Author(s): Alexander Lindsey

    As temperatures remain hot for much of the state, corn continues to put on leaf collars and is approaching the start of flowering. Corn is a plant that has separate male (anthers on the tassel) and female (silks in the ear) flowers, and it is critical that the timing of flower emergence and activity overlap (sometimes referred to as the ‘nicking’ period) to ensure good pollination and kernel set. Another term used for flowering synchrony is the ‘anthesis-silking interval,’ which is the time from pollen shedding to silk emergence.

    Issue: 2020-22

  5. Corn Growth in Hot and Dry Conditions

    Author(s): Alexander Lindsey , Author(s): Peter Thomison

    In recent days we have been experiencing 90 degree F days with limited precipitation, and so we are starting to see some leaf rolling in corn. Some of this may be related to reductions in soil moisture, but may be related to restricted root systems as well. Depending on the stage of corn at the time of these conditions, different effects on yield may be expected. Corn ear development occurs throughout the growing season, and extreme temperature or moisture stress at different growth stages will decrease different aspects of grain yield.

    Issue: 2020-21
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