C.O.R.N. Newsletter

  1. Early Corn Coloration – Green, Purple, or Yellow?
    Author(s): Alexander Lindsey , Author(s): Steve Culman , Author(s): Peter Thomison

    Corn seedlings often turn yellow (due to low nitrogen uptake and/or limited chlorophyll synthesis) or purple (reduced root development and/or increased anthocyanin production) under cool, wet conditions. Some hybrids are more likely to increase anthocyanin (purple pigment) content when plants are cool. Yellowing or purpling of corn plants at this stage of development generally has little or no effect on later crop performance or yield potential.

    Issue: 2018-16
  2. Interveinal leaf striping often variable across fields. Source: B. McDonald, 2018
    Author(s): Steve Culman , Author(s): Peter Thomison

    Leaf striping (interveinal chlorosis) in corn is appearing in many Ohio fields.  There are several nutrient deficiencies (including sulfur, zinc, magnesium, and manganese) that result in leaf striping and some of these look similar. The severity of the striping may vary considerably within a field and may be associated with differences in soil pH, organic matter, compaction, tillage, temperature and moisture. Bright yellow to white interveinal striping running the length of leaves may be the result of “genetic stripe”, but it’s usually limited to scattered plants within a field.

    Issue: 2018-16
  3. Author(s): Alexander Lindsey , Author(s): Peter Thomison , Author(s): Steve Culman

    Additional Author: Taylor Dill

    Around the state, there are many corn fields with young plants with standing water due to the intense storms that have passed through. But what are the long-term effects of standing water on emerged corn? Preliminary data from two locations in Ohio in 2017 suggests that as long as a sidedress N application can be made following the waterlogging, yield loss may be minimal if the waterlogged conditions lasted 4 days or less.

    Issue: 2018-15
  4. Author(s): Peter Thomison

    Staging corn development early in the season is usually fairly straightforward. Starting with the first leaf, which has a short rounded leaf tip (sometimes characterized as the “indicator” leaf), count the number of leaves with visible leaf collars. The collar is the yellow green band that appears at the junction of the leaf blade and leaf sheath.  But what do you do when leaves are not readily evident due to severe plant defoliation caused by hail (like that shown in the picture above, frost, or a combination of factors?

    Issue: 2018-15
  5. Author(s): Mark Badertscher

    So what is the relationship between healthy soils and healthy water? How can you manage inputs and planting date for high economic corn yields? Which soils should respond to sulfur applications? What are some opportunities and considerations with subsurface placement of nutrients? How can you build soil health and organic matter with cover crops and no-till? How can you use economics in the choice between growing corn and soybeans? What will the revised P index look like? How can you get started in honey bees, barley, or hops production?

    Issue: 2018-04
  6. Author(s): Peter Thomison

    The recent cooler than normal temperatures may impact corn drydown. Once corn achieves physiological maturity (when kernels have obtained maximum dry weight and black layer has formed), it will normally dry approximately 3/4 to 1% per day during favorable drying weather (sunny and breezy) during the early warmer part of the harvest season from mid‑September through late September. By early to mid‑October, dry-down rates will usually drop to ½ to 3/4% per day.

    Issue: 2017-30
  7. Author(s): Peter Thomison

    According to the National Agricultural Statistics Service (http://www.nass.usda.gov/) as of Sept. 10, 69 percent of Ohio’s corn acreage was in the dent stage (R5) compared to 76 percent for the five-year average; 16 percent of the corn acreage was mature, slightly less than the five-year average, 18 percent.

    Issue: 2017-30
  8. Abnormal ears of corn
    Author(s): Peter Thomison

    When checking corn fields prior to harvest, it’s not uncommon to encounter ears exhibiting abnormal growth such as those shown below (Fig. 1), especially when the crop has experienced stress conditions. Some of these ear and kernel anomalies have a limited impact on corn production but others can affect yield and grain quality adversely. To assist with the diagnosis and management of various ear and kernel disorders, check the following: “Troubleshooting Abnormal Corn Ears” available online at http://u.osu.edu/mastercorn/

    Issue: 2017-28
  9. Author(s): Peter Thomison

    Issue: 2017-24
  10. Author(s): Peter Thomison , Author(s): Rich Minyo

      Many Ohio corn fields have been subject to excessive rainfall this year. The fields where the Ohio Corn Performance Test (OCPT) were planted are no exception. Extraordinary rainfall accumulation has occurred at nearly all OCPT sites. Rainfall accumulations from May 15 to July 18-19 (and there’s been more since then) range from 14.0 to 19.1 inches at test sites in the southwest/west central/central region.

    Issue: 2017-23

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